PC130-7

SEBM036300

MACHINE MODEL

SERIAL NUMBER

PC130-7

70001 and up

• This shop manual may contain attachiments and optional equipment that are not available in your area. Please consult your local Komatsu distributor for those items you may require. Materials and specifications are subject to change without notice. • PC130-7 mounts the SAA4D95LE-3 engine. For details of the engine, see the 95-3 Series Engine Shop Manual.

© 2004 All Rights Reserved Printed in Japan 03-04(02)

00-1

CONTENTS No. of page

01

GENERAL ................................................................................................................01-1

10

STRUCTURE AND FUNCTION .................................................................10-1

20

TESTING AND ADJUSTING .......................................... To be issued next time

30

DISASSEMBLY AND ASSEMBLY ............................. To be issued next time

40

MAINTENANCE STANDARD......................................................................40-1

90

OTHERS ....................................................................................................................90-1

00-2

PC130-7

01 GENERAL

GENERAL ASSEMBLY DRAWING ........................................... 01-2 SPECIFICATIONS ..................................................................... 01-4 WEIGHT TABLE ........................................................................ 01-7 LIST OF LUBRICANTS AND WATER ....................................... 01-9

PC130-7

01-1

GENERAL

GENERAL ASSEMBLY DRAWING

GENERAL ASSEMBLY DRAWING SPECIFICATION DIMENSIONAL DRAWING

Item

Unit

PC130-7 2.5 m arm, 500 mm shoe

3.0 m arm, 700 mm shoe

A

Overall length

mm

7,595

7,485

B

Overall height

mm

2,810

3,170

C

Overall width

mm

2,490

2,490

D

Shoe width

mm

500

700

E

Cab height

mm

2,810

2,810

F

Trail swing radius

mm

2,190

2,190

G

Crawler overall length

mm

3,610

3,610

H

Distance between tambler center

mm

2,880

2,880

01-2

PC130-7

GENERAL

GENERAL ASSEMBLY DRAWING

WORKING RANGE DRAWING

Working range (mm)

PC130-7 2.5 m arm

3.0 m arm

A

Maximum digging radius

8,290

8,785

B

Maximum digging depth

5,520

6,015

C

Maximum digging height

8,610

8,790

D

Maximum vertical wall digging depth

4,940

5,360

E

Maximum dumping height

6,170

6,535

F

Minimum swing radius of work equipment

2,450

2,610

G

Maximum reach at ground level

8,170

8,665

PC130-7

01-3

GENERAL

SPECIFICATIONS

SPECIFICATIONS PC130-7

Machine model


Bucket capacity (SAE)

0.5

0.5

Operating weight

kg

12,200

13,050

Max. digging depth

mm

5,520

6,015

Max. vertical wall depth

mm

4,940

5,360

Max. digging reach

mm

8,290

8,785

Max. reach st ground level

mm

8,170

8,665

Max. digging height

mm

8,610

8,970

Max. dumping height

mm

6,170

6,535

kN {kg}

93.2 {9,500}

93.2 {9,500}

Swing speed

rpm

11.0

11.0

Swing max. slope angle

deg.

2.0

2.0

Travel speed (Hi/Lo)

km/h

2.7/5.5

2.7/5.5

Gradeability

deg.

35

35

Ground pressure

{kg/cm 2}

38 {0.39}

29 {0.30}

7,595

7,485

Max. digging force (bucket)

Dimension

Overall length (for transport)

kPa

mm

Overall width

mm

2,490

2,490

Overall height (for transport)

mm

2,810

3,170

Overall height to top of cab

mm

2,730

2,730

Ground clearance of counterweight

mm

855

855

Min. ground clearance

mm

400

400

Tail swing radius

mm

2,190

2,190

Min. swing radius of work euipment

mm

2,450

2,450

Height of work equipment at min. swing radius

mm

6,455

6,455

Length of track on ground

mm

3,610

3,610

Distance between tumbler center

mm

3,880

3,880

Track gauge

mm

1,990

1,990

Overall height of machine cab

mm

1,885

1,885

Model

SAA4D95LE-3

Type

4-cycle, water-cooled, in-line, vertical, direct injection, with turbochatger, after cooler

No. of cylinders-bore x stroke

mm

4 – 95 x 115

l {cc}

3.260 {3,260}

Rated horsepower

kW/rpm{HP/rpm}

66.2/2,200 {88.7/2,200}

Max. torpue

Nm/rpm{kgm/rpm}

353/1,500 {36.0/1,500}

High idling speed

rpm

2,400

Low idling speed

rpm

1,100

g/kWh{g/HPh}

224 {165}

Performance

Piston displacement Engine

70001 and up m3

Working ranges

Performance

Serial No.


Min. fuel consumption ratio

01-4

PC130-7

GENERAL

SPECIFICATIONS

PC130-7

Machine model


Serial No.

70001 and up 24V, 3.0 kw

Alternator

24V, 25A

Battery

12V, 64 Ah x 2

Radiator type

Aluminum wave (4-line)

Carrier roller

1 on each side

Track roller

7 on each side

Track shoe (iron shoe)

Asembly-type triple grouster, 43 on each side

Hydraulic pump

(road liner) Type x no.

Hydraulic motor Control valve

Type x no.

Road liner, 43 on each side Variable displacement piston type x 1

Discharge Set pressure (at operation)

l /min

226 (at 2,200rpm)

MPa {kg/cm2}

31.9 {325}

(at traveling)

34.8 {355} 7-spool type x 1

Control method

Hydraulic type

Travel motor

Variable displacement piston type (with brake valve, holding brake) x 2

Swing motor

Fixed displacement piston type (with safety valve, holding brake) x 1

Hydraulic tank

Box-shaped, open

Hydraulic filter

Tank return side

Hydraulic cooler

Air cooled

PC130-7

Boom cylinder

Work equipment cylinder

Type

Reciprocating piston tipe


Cylinder inner diameter

mm

105

105

Piston rod diameter

mm

70

70

Stroke

mm

990

990

Max. length betwiin pins

mm

2,490

2,490

Min. length betwiin pins

mm

1,500

1,500



Type Arm cylinder

Undercarriage

Engine

Starting motor

Hydraulic system



mm

115

115

Piston rod diameter

mm

75

75

Stroke

mm

1,175

1,175


mm

2,877

2,877


mm

1,702

1,702

01-5

GENERAL

SPECIFICATIONS

PC130-7

Machine model


01-6

70001 and up

Type Bucket cylinder

Work equipment cylinder

Hydraulic system

Serial No.





mm

95

95

Piston rod diameter

mm

65

65

Stroke

mm

885

885


mm

2,263

2,263


mm

1,378

1,378

PC130-7

GENERAL

WEIGHT TABLE

WEIGHT TABLE

k

This weight table is a guide for use when transporting or handling component. Unit: kg Machine model

PC130-7

Serial No.

70001 and up

Engine assembly (excl. water, oil)

449

• Engine (excl. water, oil)

345

• Engine mount

19.6

• PTO

4.1

• Hydraulic pump

80

Radiator, oil cooler assembly

83

Revolving frame

1,110

Operator's cab

279

Operator's seat

35

Fuel tank (excl. fuel)

101

Hydraulic tank (excl. hydraulic oil)

89

Control valve

116

Self pressure reducing valve

4.8

Counterweight

2,455

Swing motor (with brake valve)

26

Swing circle

155

Swing machinery

72.2

Center swivel joint

28.6

Track frame assembly

2,260

• Track frame

1,280

• Idler assembly

79 x 2

• Recoil spring assembly

69.5 x 2

• Carrier roller

16.5 x 2

• Track roller

21 x 14

• Travel motor, final drive assembly

144 x 2

• Sprocket

33.7 x 2

Track shoe assembly • Triple grouser shoe (500mm)

725 x 2

• Triple grouser shoe (600mm)

815 x 2

• Triple grouser shoe (700mm)

905 x 2

• City pad shoe (500mm)

720 x 2

• Road liner (500mm)

780 x 2

PC130-7

01-7

GENERAL

WEIGHT TABLE

Unit: kg Machine model

PC130-7

Serial No.

70001 and up

Boom assembly

1,088

Arm assembly

392.4

Bucket link assembly

92.7

Bucket assembly

369

Boom cylinder assembly

92.7

Arm cylinder assembly

135

Bucket cylinder assembly

82.6

01-8

PC130-7

GENERAL

LIST OF LUBRICANTS AND WATER

LIST OF LUBRICANTS AND WATER

RESERVOIR

KIND OF -22 FLUID -30

AMBIENT TEMPERATURE -4 -20

14 -10

32 0

50 10

68 20

CAPACITY ( ) 86 30

104°F 40°C

Specified

Refill

17.5

16

0.75

0.75

2.5

2.5

2.5

2.5

0.090 --0.105

0.090 --0.105

0.075 --0.085

0.075 --0.085

0.068 --0.076

0.068 --0.076

140

90

SAE 30 SAE 10W

Engine oil pan

SAE 10W-30 SAE 15W-40 PTO case Swing machinery case Final drive case (each)

SAE 30 Engine oil

Idler (each) Track roller (each)

SAE 30

Carrier roller (each) SAE 10W SAE 10W-30

Hydraulic system

SAE 15W-40 Hydraulic oil

Fuel tank

HD46-HM (a) ASTM D975 No.2

Diesel fuel

240

ASTM D975 No. 1 Cooling system

PC130-7

Coolant

Add antifreeze

18.2

01-9

10 STRUCTURE AND FUNCTION

PTO ...........................................................................10- 2 COOLING SYSTEM ..................................................10- 3 POWER TRAIN .........................................................10- 5 SWING CIRCLE ........................................................10- 6 SWING MACHINERY................................................10- 7 TRACK FRAME.........................................................10- 8 IDLER CUSHION ......................................................10- 9 HYDRAULIC COMPONENT LAYOUT ......................10- 10 VALVE CONTROL.....................................................10- 12 HYDRAULIC TANK AND FILTER..............................10- 14 HYDRAULIC PUMP (PISTON PUMP) ......................10- 15 CONTROL VALVE .....................................................10- 36 SUCTION SAFETY VALVE .......................................10- 46 CLSS .........................................................................10- 47 SELF PRESSURE REDUCING VALVE ....................10- 79 CENTER SWIVEL JOINT..........................................10- 86 TRAVEL MOTOR (FINAL DRIVE).............................10- 87 SWING MOTOR ........................................................10- 96 SOLENOID VALVE....................................................10-102 PPC ACCUMULATOR...............................................10-104 PPC VALVE ...............................................................10-105 WORK EQUIPMENT ................................................. 10-116 AIR CONDITIONER PIPING ..................................... 10-117 ENGINE CONTROL ..................................................10-118 ELECTRIC CONTROL SYSTEM ..............................10-123 MONITOR SYSTEM..................................................10-150

PC130-7

10-1

STRUCTURE AND FUNCTION

PTO

PTO

1. 2. 3. 4.

Coupling Shaft Cage Hydraulic pump

10-2

5. Level plug 6. Oil filler plug 7. Breather

PC130-7


COOLING SYSTEM

COOLING SYSTEM

PC130-7

10-3


1. 2. 3. 4. 5. 6. 7. 8.

COOLING SYSTEM

9. 10. 11. 12. 13. 14. 15. 16.

Reservoir tank Shroud Oil cooler Fan Radiator Fan guard Oil cooler Radiator cap

Charge air inlet hose Radiator inlet hose Charge air outlet hose Oil cooler outlet Drain valve Radiator outlet hose Air condenser Oil cooler inlet

SPECIFICATION Radiator

Oil cooler

Charge air cooler

Aluminum wave (4-line)

CF40

Aluminum wave

(mm)

3.5/2

3.5/2

4.0/2

(m 2)

25.58

11.60

9.54

Pressure valve cracking pressure (kPa {kg/cm2})

49.0 ± 14.7 {0.5 ± 0.15}

—

—

Vacuum valve cracking pressure (kPa {kg/cm2})

-4.9 – 0 {-0.05 – 0}

—

—

Core type Fin pitch Total heat dissipation surfase

10-4

PC130-7


POWER TRAIN

POWER TRAIN

1. 2. 3. 4. 5. 6. 7.

Idler Control valve Self pressure reducing valve Travel motor Hydraulic pump Engine 2-stage relief solenoid valve

PC130-7

8. 9. 10. 11. 12. 13. 14.

Swing hold brake solenoid valve 2-speed travel changeover solenoid valve PPC lock solenoid valve Swing motor Center swivel joint Swing machinery Swing circle

10-5


SWING CIRCLE

SWING CIRCLE

1. Outer race 2. Ball 3. Inner race a. Inner race soft zone "S" position b. Outer race soft zone "S" position

10-6

SPECIFICATIONS Reduction ratio: – 90 = – 8.182 11 Amount of grease: 6.5

l (Grease: G2-LI)

PC130-7


SWING MACHINERY

SWING MACHINERY

1. 2. 3. 4. 5. 6. 7. 8. 9.

Swing pinion (No. of teeth: 11) Case No. 2 sun gear (No. of teeth: 17) No. 2 planetary carrier (No. of teeth: 17) Ring gear (No. of teeth: 61) No. 1 planetary carrier (No. of teeth: 17) No. 1 sun gear (No. of teeth: 14) Oil level gauge/ oil filler port Swing motor

PC130-7

10. 11. 12. 13.

No. 1 planetary gear (No. of teeth: 24) No. 2 planetary gear (No. of teeth: 22) Drain plug Swing circle

SPECIFICATION + 61 + 61 Reduction ratio: 14 14 x 17 17 = 24.58

10-7


TRACK FRAME

TRACK FRAME

1. 2. 3. 4.

Idler Track frame Carrier roller Travel motor

10-8

5. 6. 7. 8.

Sprocket Track roller Idler cushion Track shoe

PC130-7


IDLER CUSHION

IDLER CUSHION

1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Idler Support Yoke Cylinder Recoil spring U-packing Pilot Nut Valve Grease fitting

PC130-7

SPECIFICATION Grease : G2-LI Amount of filled grease : 140 m

l

10-9


HYDRAULIC COMPONENT LAYOUT


1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

11. 12. 13. 14.

Bucket cylinder Arm cylinder Boom cylinder Hydraulic tank Swing motor Hydraulic pump Oil cooler L.H. travel motor Control valve 4-spool solenoid valve • PPC lock • 2-speed travel speed selection • Swing holding brake • 2-stage relief L.H. PPC valve R.H. PPC valve Travel PPC valve Center swivel joint

10-10

PC130-7


PC130-7


10-11


VALVE CONTROL

VALVE CONTROL

10-12

PC130-7


VALVE CONTROL

1. R.H. work equipment PPC valve 2. R.H. work equipment control lever (for boom and bucket operation) 3. Main pump 4. Control valve 5. 4-spool solenoid valve 6. L.H. work equipment control lever (for arm, swing operation) 7. L.H. work equipment PPC valve 8. Safety lock lever 9. L.H. travel pedal 10. R.H. travel pedal 11. L.H. travel lever 12. R.H. travel lever 13. Travel PPC valve 14. Attachment PPC valve (Attachment installable machine) 15. Attachment pedal (Attachment installable machine) Lever and Pedal Positions (A) HOLD (B) Boom LOWER (C) Boom RAISE (D) Bucket CURL (E) Bucket DUMP (F) HOLD (G) Arm OUT (H) Arm IN (J) Swing LEFT (K) Swing RIGHT (L) L.H. travel FORWARD (M) L.H. travel REVERSE (N) R.H. travel FORWARD (P) R.H. travel REVERSE (Q) PPC FREE (R) PPC LOCK

PC130-7

10-13


HYDRAULIC TANK AND FILTER

HYDRAULIC TANK AND FILTER

1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Hydraulic tank Drain plug Oil filler cap Pressure valve Vacuum valve Sight gauge Suction strainer Filter element Bypass strainer Bypass valve

10-14

SPECIFICATION Tank capacity : 130 Hydraulic oil amount in tank : 90 Pressure valve cracking pressure : 16.7 ± 6.9 kPa {0.17 ± 0.07 kg/cm2} Vacuum valve cracking pressure : -0.49 – 0 kPa {-0.005 – 0 kg/cm2} Bypass valve set pressure : 103 ± 29.4 kPa {1.05 ± 0.2 kg/cm2}

l

l

PC130-7


HYDRAULIC PUMP

HYDRAULIC PUMP (PISTON PUMP) MAIN PUMP Type : HPV95 (for 105cc/rev.)

1. 2. 3. 4. 5. 6.

Main pump LS valve PC valve Fixed choke valve PC-EPC valve (for PC mode selection) LS-EPC valve (for LS set selection)

PC130-7

IM : PC mode change current PA : Main pump delivery PB : Main pump pressure input PS : Main pump absorption PD1 : Case drain PLS : Control valve LS pressure inlet PEPC : EPC valve basic pressure inlet

10-15


1. 2. 3. 4. 5. 6. 7.

Shaft Cradle Case Rocker cam Shoe Piston Cylinder block

10-16

HYDRAULIC PUMP

8. 9. 10. 11. 12. 13.

Valve plate End cap Spring Servo last chance filter Servo piston Slider

PC130-7


HYDRAULIC PUMP

FUNCTION • This pump converts engine rotation and torque transmitted to the pump shaft into hydraulic energy and discharges pressurized oil according to load. • This pump can change delivery when the swash plate angle is changed.

STRUCTURE • The cylinder block (7) is supported to the shaft (1) with the spline a, and the shaft (1) is supported with the front and rear bearings. • The shoe (5) is punched to the tip of the piston (6) with a concave ball so that the piston (6) and the shoe (5) form a spherical bearing. • The shoe (5) is always pressed to the plane A of the rocker cam (4) and slides in a circle. The rocker cam (4) leads highly pressurized oil together with the cylindrical plane B with the cradle (2) fixed to the case, forms a static pressure bearing and slides. • The piston (6) moves in the axial direction relatively in each cylinder of the cylinder block (7). • The cylinder block (7) rotates relatively while sealing pressurized oil against the valve plate (8), and the plane is designed to balance the oil pressure properly. • Oil in each cylinder of the cylinder block (7) is absorbed and discharged through the valve plate (8). PC130-7

10-17


HYDRAULIC PUMP

OPERATION 1. Pump Operation • The shaft (1) rotates together with the cylinder block (7), and the shoe (5) slides on the plate A. When the rocker arm (4) moves along the cylindrical plane B, the inclination to the centerline X of the rocker cam (4) and the axial direction of the cylinder block (7) changes. The inclination is called "swash plate angle."

•

•

•

•

•

When the swash plate angle of the center line X of the rocker cam (4) is to the axial direction of the cylinder block (7), the plane A works like the cam against the shoe (5). Therefore, the piston (6) slides inside the cylinder block (7), and the capacities E and F of the cylinder block (7) come to change differently. Then, the pump absorbs and discharges the difference E-F. When the capacity in the E chamber contracts as the cylinder block (7) rotates, the pump discharges oil during the process. On the other hand, when the capacity in the F chamber increases, the pump absorbs oil during the process. (The figure shows the end of the absorbing process in the Chamber F and the end of the discharging process in the Chamber E. When the centerline X of the rocker cam (4) comes to the axial direction of the cylinder block (7) (when the swash plate angle is 0), the difference between the capacities E and F in the cylinder block (7) comes to 0. And the pump comes to stop absorbing or discharging oil, i.e., the pump stops. (However, the swash plate angle never comes to 0 practically.) In the other words, the swash plate angle and the pump delivery are in the proportional relations.

10-18

PC130-7


HYDRAULIC PUMP

2. Delivery Control • When the swash plate angle increases, the difference between the capacities E and F becomes larger and the delivery Q increases. The servo piston (12) changes the swash plate angle . • The servo piston moves in the direction of straight reciprocation according to signal pressures of the PC and LS valves. This straight motion is transmitted to the rocker arm (4) through the slider (13), and the rocker cam (4), which is supported with the cylindrical plane to the cradle (2), slides in the direction of rotation.

•

•

•

The servo piston's (12) area receiving the pressure is different on the right and left sides, and the discharge (self) pressure PP from the main pump is always led to the pressure chamber of the small diameter piston. The output pressure Pen of the LS valve is led to the pressure chamber of the large diameter piston. Motions of the servo piston are controlled according to the relations between the small diameter piston pressure PP and the large diameter piston pressure Pen and the rate of area receiving pressure of the small diameter piston to that of the large diameter piston.

PC130-7

10-19


HYDRAULIC PUMP

LS AND PC VALVE LS valve

1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Sleeve Piston Spool Seat Plug Spring Sleeve Nut O-ring Nut

PA : Pump pressure inlet PB : Pump pressure inlet PDP : Drain PLP : Control pressure outlet PLS : Over load pressure inlet PPL : Control pressure intle PSIG : LS mode switching pressure inlet

PC Valve

1. 2. 3. 4. 5. 6. 7. 8. 9.

Piston Spring Seat Spring Seat Spool Piston Sleeve Lock nut

10-20

10. Plug 11. Lock nut PA PA2 PD PM PPL

: Pump discharge pressure inlet : Pump discharge pressure inlet : Drain pressure outlet : PC mode switching pressure inlet : PC valve signal pressure outlet

PC130-7


HYDRAULIC PUMP

FIXED THROTTLE VALVE

1. Plug 2. Plug PA : Drain pressure outlet POUT : Control pressure outlet PIN : LS valve signal pressure inlet

PC130-7

10-21


HYDRAULIC PUMP

FUNCTION 1. LS Valve • The LS valve detects loads and controls delivery. • This valve controls the main pump delivery Q with the differential pressure PLS (PP – PLS) [that is called LS Differential Pressure] between the main pump pressure PP and the control valve outlet pressure PLS. • This valve is applied with the main pump pressure PP, the pressure PLS that is obtained from the control valve output [that is called LS Pressure] and the pressure PSIG from the LS-EPC valve [that is called LS Selection Pressure]. • The relations of the differential pressure PLS (= PP – PLS) between the main pump pressure PP and the LS pressure PLS with the delivery Q vary with the LS selection current ISIG of the LSEPC valve as shown in the right figure. • As ISIG changes from 0 to 1A, the spring set force changes accordingly, and the selector point for pump discharge amount changes from 0.64 to 2.1 MPa {6.5 to 21.5 kg/cm2} at the standard median. 2. PC Valve • When the pump discharge pressure PP rises, the control valve spool stroke will increase and the opening area will enlarge. So, the PC valve controls the pump delivery Q so that the delivery Q does not increase above a certain level depending on the discharge pressure PP. The valve also controls the pump absorbing hydraulic horsepower to approximately equal horsepower so that the pump absorbing horsepower does not exceed the engine horsepower. • This means that, when a load to the actuator increases during operation and the pump discharge pressure PP rises, this valve will reduce the pump delivery Q, or when the pump discharge pressure PP drops, this valve will increase the delivery Q. • In this case, the relations between the pump discharge pressure PP and the pump delivery Q change as shown in the right figure since the current value given to the PC-EPC valve solenoid is regarded as a parameter. • However, some PC valves have the function to sense actual engine speeds in the heavy-duty operation mode and to reduce the pump delivery and recover the speed when the speed reduces due to increase of load. • In the other words, when an increase of load reduces the engine speed below the set value, the command current from the controller to the PC-EPC valve solenoid will increase as the engine speed reduces and will reduce the pump swash plate angle.

10-22

PC130-7


HYDRAULIC PUMP

OPERATION

1. LS Valve 1) When the control valve is at the center value position • The LS valve is a 3-way selector valve, and the pressure PLS (LS pressure) from the control valve inlet is being led to the spring chamber B and the pump discharge pressure PP is being led to the H port of the sleeve (8). • The spool (6) position is determined depending on the force of the LS pressure PLS + the force of spring (4) Z and the force of the pump discharge pressure (self-pressure) PP.

PC130-7

10-23


•

•

•

HYDRAULIC PUMP

Before the engine starts, the servo piston (12) is pressed to the right side. (See the right figure.) If the control lever is at the "center value" position when the engine starts, the LS pressure PLS will be 0 MPa (0 kg/cm2). (The LS valve interconnects to the drain circuit through the control valve spool.) At the time, the spool (6) is pressed to the left side and the C port is connected to the D port. The pump discharge pressure enters from the K port to the piston large diameter side and from the J port to the piston small diameter side respectively. So, the area difference of the servo piston (12) minimizes the swash plate angle.

10-24

PC130-7


2) Operation in direction for maximum pump delivery • When the LS differential pressure PLS between the pump discharge pressure PP and the LS pressure PLS reduces (when the control valve is large and the discharge pressure PP drops, for example), the combined force of the LS pressure PLS and the spring (4) pushes the spool (6) to the right side. • When the spool (6) moves, port D is connected to port E to bring the PC valve in line. At the time, the PC valve is connected to the drain port, and the circuit D – K is applied with the drain pressure PT. (The operation of the PC valve will be explained later.)

PC130-7

HYDRAULIC PUMP

•

•

•

Therefore, the pressure on the piston large diameter side of the servo piston (12) comes to the drain pressure PT, and since the pump dischargepressure PP is applied to port J on the small diameter side, the servo piston (12) is pushed to the right side and the swash plate is moved to the delivery increasing direction. When port G is applied with the output pressure of the EPC valve for the LS valve, the piston (7) is pushed to the left side. This is effective to reduce the spring (4) set force, and the differential pressure between the oil pressure PP when ports D and E of the spool (6) are connected and PP changes.

10-25


3) Operation in direction for minimum pump delivery • The following explains move of the servo piston (12) to the left side (in the direction for minimum pump delivery). When the LS differential pressure PLS increases (when the control valve opening area becomes small and the pump discharge pressure PP increases, for example), the force of the discharge pressure PP pushes the spool (6) to the left side. • As the spool (6) moves, the pump discharge pressure PP flows from port C to port D and comes from port K to the piston large diameter side.

10-26

HYDRAULIC PUMP

•

•

Though the pump discharge pressure PP comes to port J of the piston small diameter side, the servo piston (12) is pushed to the left side due to the area difference between the piston large diameter side and the piston small diameter side of the servo piston (12) and the swash plate is moved in the delivery reducing direction. When port G is applied with the LS selection pressure, it is effective to reduce the spring (4) set force.

PC130-7


4) When the servo piston balances • The area receiving the pressure on the piston large diameter side is supposed to be A1, the one on the small diameter side is supposed to be A0 and the pressure flowing to the piston large diameter side is supposed to be PEN. • When the pump discharge pressure PP of the LS valve balances with the combined force of the LS pressure PLS and the spring (4) force Z and the relations of A0 x PP = A1 x PEN are satisfied, the servo piston (12) stops at the position and the swash plate is held at the intermediate position (stops where the opening from port D to port E of the spool (6) is almost equal to the one from port C to port D). PC130-7

HYDRAULIC PUMP

•

•

•

At the time, the relations of areas receiving the pressure on the both ends of the servo piston (12) are A0 : A1 = 1 : 1.75, and the ones of pressures applied on the piston both ends at the balancing time are PP : PEN = 1.75 : 1 approximately. The spring (4) force has been adjusted so that the balance stop position of the spool (6) is determined when PP – PLS = 2.21 MPa {22.5 kg/cm 2 } is satisfied at the standard center. When port G is applied with PSIG (EPC valve output pressure for LS valve of 0 – 2.9 MPa {10 – 30 kg/cm 2 }), however, the balance stop position changes proportionally to the PSIG pressure in the range of PP – PLS from 2.1 to 0.6 MPa {21.5 to 6.5 kg/cm2}.

10-27


2. PC Valve (1) When the pump controller is normal, the load to the actuator is small and the pump discharge pressure PP is low 1) Function of PC-EPC Valve Solenoid (1) • The pump controller provides a command current to the PC-EPC valve solenoid (1). This command current actuates the PC-EPC valve and outputs a signal pressure. When receiving the signal pressure, the PC valve changes the force given to the piston (2). • The spool (3) stops where the force to the piston (2) balances with the combined force of the spring setting force of the springs (4) and (6) on the opposite side and the force given to the spool (3) by the pump discharge pressure PP.

10-28

HYDRAULIC PUMP

•

And the pressure output from the PC valve (the pressure at the C port) varies with the spool position. The value of the command current X is determined depending on type of work (lever control), selection of working mode, set point of engine speed and actual speed.

PC130-7


2) Function of Spring • The loads to the springs (4) and (6) of the PC valve are determined depending on swash plate position. • As the servo piston (9) moves, the piston (7) connected to the slider (8) moves to the right or the left. • When the piston (7) moves to the left, the spring (6) will be contracted. If the piston moves further to the left, the spring will be brought to the seat (5) and be fixed there. Thereafter, the spring (4) will only move. This means that the spring load changes as the piston (7) extends or contracts the springs (4) and (6).

PC130-7

HYDRAULIC PUMP

•

•

Also, since the pressing force of the piston (2) changes as the command current input to the PC-EPC valve solenoid (1) changes, the load to the springs (4) and (6) changes depending on the value of the command current. The C port of the PC valve is connected to the E port of the LS valve. The self pressure PP is provided to the A port, the small diameter side of the servo piston (9) and the B port.

10-29


•

•

•

10-30

HYDRAULIC PUMP

When the pump discharge pressure PP is small, the spool is located at a position in the left direction. At the time, the C port is connected to the D port, and the pressure to the LS valve becomes the drain pressure PT. If the E port of the LS valve is connected to the G port at the time, the pressure from the J port to the large diameter side of the piston will become the drain pressure PT. And the servo piston will moves to the right side. Then, the pump delivery will come to increase. Also, as the servo piston (9) operates, the slider (8) moves the piston (7) to the right side, and the spring force becomes weak because the springs (4) and (6) expand. As the spring force becomes weak, the spool (3) moves to the right side to disconnect the C port from the D port. Then, the pump discharge pressure ports B and C are connected. As a result, the pressure at the C port rises and the pressure on the large diameter side of the piston rises as well, and the servo piston (9) stops moving to the right side. This means that the stop position of the servo piston (9) (= pump delivery) is determined where the pressing force caused the pressure PP to the spool (3), the pressing force of the PCEPC valve solenoid and the forces of the springs (4) and (6) balance with each other.

PC130-7


(2) When the pump controller is normal, the load to actuator is large and the pump discharge pressure PP is high • When the load is large and the pump discharge pressure is high, the force pushing the spool (3) to the left side increases and the spool (3) comes to the position shown in the above figure. • Then, the pressure flowing from the C port to the LS valve becomes about 3/5 of the pump discharge pressure PP because the pressure from the A port partly flows from the C port to the D port through the LS valve as shown in the above figure.

PC130-7

HYDRAULIC PUMP

•

•

When the E port of the LS valve is connected to the G port, this pressure is led from the J port to the large diameter side of the servo piston (9) and the servo piston comes to stop. When the pump discharge pressure PP increase and the spool (3) moves further to the left side, the discharge pressure PP will flow to the C port so as to minimize the pump delivery.

10-31


•

•

HYDRAULIC PUMP

When the servo piston (9) moves to the left side, the piston (7) will move to the left. Then, the springs (4) and (6) will be compressed and will push the spool (3) back. If the piston (7) moves further to the left, the ports C and D will open wide. As a result, the pressure at the port C (= J) will drop, and the servo piston (9) will move to the left and will stop. At the time, the servo piston (9) is located further to the left than where it is when the pump discharge pressure PP is low.

•

The positional relations between the pump discharge pressure PP and the servo piston (9) are shown by a broken line because the springs (4) and (6) are 2-stage ones. And the relations between the discharge pressure PP and the pump delivery Q are as shown in the right figure.

•

Also, when the command current X to the PC-EPC valve solenoid increases, the relations between the pump discharge pressure PP and the pump delivery Q will move in parallel in relation to the pushing force of the PC-EPC valve solenoid. Therefore, the force of the PC-EPC valve solenoid (1) will be added to the leftward pressing force of the discharge pressure PP to the spool (3), and the relations between PP and Q will move from to as X increases.

10-32

PC130-7


3) When the pump controller is out of order and the PC redundant switch is set to ON 1) In case of light load to main pump • When the pump controller is out of order, set the PC redundant switch to ON to change the circuit to the resistor side. In this case, since the current is too large when the power is directly taken from the battery, the resistor is connected to control the current to the PC-EPC valve solenoid. • At the time, the current becomes constant and the piston (2) pressing force becomes constant as well.

PC130-7

HYDRAULIC PUMP

•

•

When the pump discharge pressure is low, the combined force of the force of the PC-EPC valve solenoid (1) and the discharge pressure PP is smaller than the spring set force. So, the spool (3) balances at a position in the left side. At the time, the C port has the same pressure as the drain pressure at the D port, and the drain pressure PT is led to the large diameter side of the servo piston (9) through the LS valve. Then, the servo piston (9) moves in the diction where the delivery increases because the pressure on the small diameter side of the piston is large.

10-33


HYDRAULIC PUMP

2) In case of heavy load to main pump • When the PC redundant switch is set to ON just like in the previous paragraph, a constant command current is sent to the PC-EPC valve solenoid (1). So, the piston (2) pushes the spool (3) with a constant force. • When the pump discharge pressure PP rises, the spool will moves further to the left side than when the main pump is lightly loaded and will balance at the position shown in the above figure. • In this case, since the pressure from the A port is led to the C port, the servo piston (9) will move to the left side (small delivery) and will stop at a position further to the left than when the pump is lightly loaded.

10-34

PC130-7


•

•

PC130-7

HYDRAULIC PUMP

This means that the current, which is sent to the PC-EPC valve solenoid through the resistor when the PC redundant switch is set to On, determines the curve between the pump discharge pressure PP and the delivery Q as shown in the figure. When the PC redundant switch is set to ON, the curve is further to the left than the curve drawn when the pump controller is normal.

10-35


CONTROL VALVE

CONTROL VALVE OUTLINE There are the following 2 types of contral valve. • 6-spool valve (without service valve) • 7-spool valve (with service valve) • 7-spool valve (with blade) • 8-spool valve (with blade and service valve) Each service valve is a single add-on type, so it is possible to add or remove the extra valve at any time. Extermal oppearance and cross section is given only for the 7 spool valve.

a

AA A1 A2 A3 A4 A5 A6 A7 B1 B2 B3 B4 B5 B6 B7 BP LS PA1 PA2 PA3 PA4 PA5 PA6 PA7 PB1 PB2 PB3 PB4 PB5 PB6 PB7 P PP PX SA SB TS1 TS2 TB TC TSW

: Pressure sensor port (pressure sensor is intalled) : To swing motor MB : To L.H. travel motor A : To R.H. travel motor A : To boom cylinder bottom : To arm cylinder head : To bucket cylinder head : To attachment 1 : To swing motor MA : To L.H. travel motor B : To R.H. travel motor B : To boom cylinder head : To arm cylinder bottom : To bucket cylinder bottom : To attachment 1 : From boom RAISE PPC/EPC valve : To pump LS valve : From swing L.H. PPC/EPC valve : From L.H. travel forward PPC valve : From R.H. travel reverse PPC valve : From boom RAISE PPC/EPC valve : From arm OUT PPC/EPC valve : From bucket DUMP PPC/EPC valve : From service 1 PPC valve : From swing R.H. PPC/EPC valve : From L.H. travel reverse PPC valve : From R.H. travel forward PPC valve : From boom LOWER PPC/EPC valve : From arm IN PPC/EPC valve : From bucket CURL PPC/EPC valve : From service 1 PPC valve : From main pump : To main pump : From 2-stage relief solenoid valve : From swing stroke contral solenoid valve : From swing stroke contral solenoid valve : To tank : To tank : To tank : To oil cooler : To swing motor

10-36

1. Swing bleed valve 2. Travel junction valve 3. Arm regeneration valve 4. Cover 5. Service valve 6. Bucket valve 7. Arm valve 8. Boom valve 9. R.H. travel valve 10. L.H. travel valve 11. Swing valve 12. PT port block 13. Safety-suction valve

PC130-7


CONTROL VALVE

7 spool valve (6 spool valve + service valve)

PC130-7

10-37


CONTROL VALVE

CROSS-SECTIONAL DRAWING Cross-sectional drawing shows 7-spool valve (6-spool + service valve). (1/8)

a

1. 2. 3. 4. 5. 6. 7.

Safety-suction valve Suction valve (L.H. travel A) Suction valve (R.H. travel A) Suction valve (Boom bottom) Suction valve (Arm head) Suction valve (Bucket head) Safety-suction valve mount (service A)

10-38

8 Safety-suction valve mount (service B) 9. Suction valve (Bucket bottom) 10. Suction valve (Arm bottom) 11. Suction valve (Boom head) 12. Suction valve (R.H. travel B) 13. Suction valve (L.H. travel B) 14. Lift check valve

PC130-7


CONTROL VALVE

(2/8)

1. 2. 3. 4. 5. 6. 7. 8.

Main relief valve Spool (swing) Spool (L.H. travel) Spool (R.H. ravel) Spool (boom) Spool (arm) Spool (bucket) Spool (service)

PC130-7

10-39


CONTROL VALVE

(3/8)

1. 2. 3. 4. 5. 6. 7. 8.

Pressure compensation valve F (swing) Pressure compensation valve F (L.H. travel) Pressure compensation valve F (R.H. travel) Pressure compensation valve F (boom) Pressure compensation valve F (arm) Pressure compensation valve F (bucket) Pressure compensation valve F (service) Unload valve

10-40

9. 10. 11. 12. 13. 14. 15.

a

Pressure compensation valve R (service) Pressure compensation valve R (bucket) Pressure compensation valve R (arm) Pressure compensation valve R (boom) Pressure compensation valve R (R.H. travel) Pressure compensation valve R (L.H. travel) Pressure compensation valve R (swing) The above F and R means the following valves : F : Flow control valve R : Pressure reducing valve

PC130-7


CONTROL VALVE

(4/8)

1. 2. 3. 4. 5. 6.

LS pressure detection plug LS bypass plug Pump pressure detection plug Check valve (bucket head) Check valve (arm head) LS selection valve

PC130-7

10-41


CONTROL VALVE

(5/8)

1. 2. 3. 4. 5. 6.

Main relief valve Cooler bypass valve Lift check valve LS selection valve Spool (swing) Pressure compensation valve R

10-42

7. Swing bleed valve 8. Pressure compensation valve F F : Flow control valve R : Pressure reducing valve

PC130-7


CONTROL VALVE

(6/8)

1. 2. 3. 4. 5. 6. 7.

Suction valve (A) Suction valve (B) Spool (L.H. travel) Pressure compensation valve R Travel junction valve Pressure compensation valve F Suction valve (A)

PC130-7

8. 9. 10. 11.

Suction valve (B) Spool (R.H. travel) Pressure compensation valve R Pressure compensation valve F

F : Flow control valve R : Pressure reducing valve

10-43


CONTROL VALVE

(7/8)

1. 2. 3. 4. 5. 6. 7.

Suction valve (A) Suction valve (B) Spool Pressure compensation valve R Pressure compensation valve F Suction valve (A) Suction valve (B)

10-44

8. 9. 10. 11.

Spool Pressure compensation valve R Arm regemeration valve Pressure compensation valve F


PC130-7


CONTROL VALVE

(8/8)

1. 2. 3. 4. 5. 6. 7. 8.

Suction valve (A) Suction valve (B) Spool Pressure compensation valve R Pressure compensation valve F Safty-suction valve mount (A) Safty-suction valve mount (B) Spool

PC130-7

9. 10. 11. 12.

Pressure compensation valve R Pressure compensation valve F Pressure relief plug Unload valve


10-45


SUCTION SAFETY VALVE


(SAFETY VALVE WITH SUCTION FOR SERVICE PORT) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Suction valve Main valve Piston Piston spring Poppet Poppet spring Suction valve Sleeve Adjustment screw Lock nut

SPECIFICATION Part No. (Reference)

Set pressure

Use

709-70-74600

24.5 MPa {250 kg/cm2} (at the time of 5l/min.)

For crusher

709-70-74700

17.2 MPa {175 kg/cm2} (at the time of 5l/min.)

10-46

PC130-7


CLSS

CLSS OUTLINE OF CLSS Features CLSS stands for Closed Center Load Sensing System and is featured as follows : • Fine controllability without affect of load • Controllability that allows digging even in the fine control mode. • Ease of compound operation in which the flow distribution performance depends on spool opening area during compound operation. • Saving of energy by variable pump control

PC130-7

Configuration • The CLSS consists of a variable displacement piston pump, a control valve and actuators. • The pump body consists of a main pump, a PC valve and an LS valve.

10-47


CLSS

Basic principle 1. Control of pump swash plate angle • The pump swash plate angle (pump delivery) is controlled so that the LS differential pressure PLS, which is the difference between the pump discharge pressure PP and the LS pressure PLS (actuator load pressure) at the control valve outlet, becomes constant. (LS differential pressure PLS = Pump pressure PP - LS pressure PLS)

•

a

When the LS differential pressure PLS reduces below the set pressure of the LS valve (when the actuator load pressure is high), the pump swash plate angle will move in the direction of maximum. When the set pressure is raised (when the actuator load pressure is low), the pump swash plate angle will move in the direction of minimum. For the detail of the operation, see the paragraph of "Hydraulic Pump."

10-48

PC130-7


CLSS

2. Pressure compensation control • A valve (pressure compensation valve) is mounted on the outlet side of the control valve. In case of compound operation of the actuator with this valve, the differential pressure P between the spool upstream (inlet) and the downstream (outlet) of each valve becomes constant irrespective of load (pressure). So, the flow from the pump is distributed (compensated) in proportion to the opening areas S1 and S2 of each valve being operated.

PC130-7

10-49


CLSS

EACH FUNCTION AND OPERATION OF EACH VALVE Hydraulic circuit diagram and valve names

10-50

PC130-7


CLSS

1. Unload valve Set pressure : 3.38 MPa {34.5 kg/cm2} 2. Safety-suction valve Set pressure : 35.8 MPa {365 kg/cm2} 3. Pressure compensation valve 4. Suction valve 5. Main relief valve Set pressure : normal: 31.9 MPa {325 kg/cm2} High pressure : 34.8 MPa {355 kg/cm2} 6. Lift check valve 7. Cooler bypass valve 8. LS selection valve 9. Swing bleeding valve 10. Travel junction valve 11. Arm regeneration valve

PC130-7

10-51


CLSS

UNLOAD VALVE 1. When the control valve is neutral FUNCTION • When the control valve is neutral, the delivery Q equivalent to the pump minimum swash plate angle is released to the tank circuit. At the time, the pump discharge pressure PP is set to 2.45 MPa {25.0kg/cm2} with the spring (3) inside the vale. (The LS pressure PLS is 0 MPa {0kg/cm2}.)

OPERATION • The pump discharge pressure PP is applied to the left end face of the spool (4) and the LS pressure PLS is applied to the right end face. • Since the LS pressure PLS is 0 when the control valve is neutral, the pump discharge pressure PP is only applied and is set with the lead to the spring (3). • When the pump discharge pressure PP rises to the spring (3) load (2.45 MPa {25.0 kg/cm2}), the spool (4) will move toward the right side and the pump circuit PP will interconnect to the tank circuit T through the drill hole. • Therefore, the pump discharge pressure PP is set to 2.45 MPa {25.0 kg/cm2}.

10-52

1. 2. 3. 4.

Unload valve Sleeve Spring Spool

PLS : LS circuit (pressure) PP : Pump circuit (pressure) T : Tank circuit

PC130-7


CLSS

2. When the control valve is in the fine control mode

When the differential pressure between the discharge pressure PP and the LS pressure PLS comes to the spring (3) load (2.45 MPa {25.0 kg/ cm2}), the unload valve will open and the LS differential pressure PLS will come to 2.45 MPa {25.0 kg/cm2}.

FUNCTION • When the control valve is in the fine control mode and the requested flow of the actuator is less than the pump minimum swash plate angle, the pump discharge pressure PP is set to the LS pressure PLS + 2.45 MPa {25.0 kg/cm2}.

OPERATION • When the control valve is operated in the fine control mode, the LS pressure PLS will occur and will be applied to the right end face of the spool (4). At the time the differential pressure between the LS pressure PLS and the pump discharge pressure PP increases because the opening area of the control valve spool is small. • When the differential pressure between the pump discharge pressure PP and the LS pressure PLS comes to the spring (3) load (2.45 MPa {25.0 kg/cm2}), the spool (4) will move to the right side and the pump circuit PP will interconnect to the tank circuit T. • This means that the pump discharge pressure PP is set to the spring force (2.45 MPa {25.0 kg/ cm2} + LS pressure PLS, and the LS differential pressure PLS comes to 2.45 MPa {25.0 kg/ cm2}.

PC130-7

1. 2. 3. 4.



10-53


CLSS

3. When the control valve is operated FUNCTION • If the required flow of the actuator increases over the pump minimum swash plate angle when the control valve is operated, the flow to the tank circuit T will be interrupted and the pump delivery Q will be completely flown to the actuator circuit.

OPERATION • When the control valve is operated with large stroke, the LS pressure PLS will occur and will be applied to the right end face of the spool (4). At the time, the opening areas of the control valve spool is large and the difference between the LS pressure PLS and the pump discharge pressure PP is small. • So, the differential pressure between the pump discharge pressure PP and the LS pressure PLS does not reach the spring (3) load (2.45 MPa {25.0 kg/cm2}) and the spring (3) pushes the spool (4) to the left side. • Then, the pump circuit PP and the tank circuit T are interrupted, and the pump delivery Q is completely flown to the actuator circuit.

10-54

1. 2. 3. 4.



PC130-7


CLSS

LEADING OF LS PRESSURE FUNCTION • The LS pressure is load pressure to the actuator on the outlet side of the control valve. • In case of a work equipment valve, the pressure reducing valve (3) of the pressure compensation valve reduces the pump discharge pressure PP to the same level as the actuator circuit pressure A and leads the pressure to the LS circuit PLS.

•

Also, the orifice C is mounted on the piston (5) halfway from the pump circuit PP to the pressure reducing valve (3), and the orifice has the damper function. The travel valves leads the actuator circuit pressure A directly to the LS circuit PLS.

1. Work equipment valve (boom, arm, bucket, swing)

OPERATION • When the spool (1) is operated, the pump discharge pressure PP will be led to the actuator circuit A through the bridge passage b from the flow control valve (2) and the spool notch a. • Since the pressure reducing valve (3) moves to the right at the same time, the pump discharge pressure PP led from the orifice c is reduced due to pressure loss at the notch d and is led to the LS circuit PLS and to the spring chamber PLS1. • At the time, the LS circuit PLS is connected to the tank circuit T from the LS bypass plug (4).

PC130-7

•

•

The both end face areas of the pressure reducing valve (3) are the same (SA = SLS), and the actuator circuit pressure PA (= A) is applied to the SA side and the reduced pump discharge pressure PP is applied to the SLS side on the opposite side. Therefore, the pressure reducing valve (3) balances at the position where the actuator circuit pressure PA becomes equal to the pressure of the spring chamber PLS1. The pump discharge pressure PP reduced at the notch d comes to the actuator circuit pressure A and is led to the LS circuit PLS.

10-55


CLSS

2. Travel valve

OPERATION • When the spool (1) is operated, the pump discharge pressure PP will be led to the actuator circuit A through the bridge passage b from the flow control valve (2) and the spool notch a. • At the same time, the actuator circuit pressure PA moves the pressure reducing valve (3) to the right side, and the notches c and d interconnect to the travel junction circuit e and the LS circuit PLS respectively. • So, the actuator circuit pressure PA (= A) is led from the notch c to the LS circuit PLS through the notch d. The travel circuit is different from the work equipment circuit, the actuator circuit pressure PA is directly led to the LS circui PLS.

a

10-56

PC130-7


CLSS

LS BYPASS PLUG FUNCTION • This plug released residual pressure of the LS pressure PLS. • This plug slows the rising speed of the LS pressure PLS, causes pressure losses at the spool and the throttle of the shuttle valve by the discarded throttled flow and reduces the effective LS differential pressure for higher safety.

OPERATION • Pressurized oil in the LS circuit PLS flows from the clearance filter a in the space between the LS bypass plug (1) and the valve body to the tank circuit T through the orifice b.

PC130-7

1. LS bypass plug PLS : LS circuit (pressure) T : Tank circuit (pressure)

10-57


CLSS

PRESSURE COMPENSATION VALVE FUNCTION • When the load pressure becomes lower than another actuator and the flow is going to increase during a compound operation, this valve compensates the load pressure. (At the time, the load pressure of another actuator under compound operation (the upper side) is higher than that of the actuator on this side (the lower side).

10-58

PC130-7


CLSS

OPERATION • When the load pressure of another actuator side (the upper side) rises during a compound operation, the flow in the actuator circuit A on this side (the lower side) is apt to increase. • In this case, the LS pressure PLS of another actuator is applied to the spring chamber PLS1 and pushes the pressure reducing valve (1) and the flow control valve (2) to the left side. • The flow control valve (2) throttles the opening area between the pump circuit PP and the spool upstream PPA and causes a pressure loss between PP and PPA. • The flow control valve (2) and the pressure reducing valve (1) balance each other where the pressure difference between PA applied to the both end faces of the pressure reducing valve (1) and PLS becomes the same as the pressure loss between PP before and after the flow control valve and PPA. • So, the pressure differences between the upstream pressures PPA and the downstream pressures PA of the both spools under compound operation become the same, and the pump flow is distributed in proportion to the opening area of each spool notch a.

PC130-7

10-59


CLSS

AREA RATIO OF PRESSURE COMPENSATION VALVE FUNCTION • The pressure compensation valve slightly adjust the ratio (S2/S1) of the area S1 on the left side of the flow control valve (2) and the area S2 on the right side of the pressure reducing valve (1) to suite the characteristics of each actuator and determines the compensation characteristics. S1 : Area of the flow control valve (2) - area of the piston (3) S2 : Area of the pressure reducing valve (1) - area of the piston (3)

Area ratio (S1:S2) and compensation characteristics • When the ratio is 1.00 : The expression [Pump (discharge) pressure PP - Spool notch upstream pressure PPB] [LS circuit pressure PLS - Actuator circuit pressure PA (= A)] can be held, and the flow is distributed as per the spool opening area ratio. • When the ratio is more than 1.00 : The expression PP - PPB > PLS - PA (= A) can be held, and the flow is distributed less than the spool opening area ratio. • When the ratio is less than 1.00 : The expression PP - PPB < PLS - PA (= A) can be held, and the flow is distributed more than the spool opening area ratio.

10-60

PC130-7


CLSS

ARM REGENERATION CIRCUIT 1. At arm in and own weight fall FUNCTION • When the arm falls due to its own weight because the head pressure A in the arm cylinder (1) is higher than the bottom pressure B during arm digging, this circuit brings the return flow on the head side to the bottom side to increase the cylinder speed.

OPERATION • When the arm falls for digging due to its own weight, the head side pressure A in the arm cylinder (1) will rise above the bottom side pressure B. • At the time, part of the return flow on the head side passes through the regeneration passage a of the arm spool (2), pushes the check valve (3) to open it and flows to the bottom side. • This increases the arm digging speed.

PC130-7

1. Arm cylinder 2. Arm spool 3. Check valve A : Head circuit (pressure) B : Bottom circuit (pressure) PP : Pump circuit (pressure)

10-61


CLSS

2. At arm in process FUNCTION • When the bottom pressure B of the cylinder (1) rises above the head pressure A and the arm enters the digging process, the check valve (3) will be closed and the circuits on the head side and the bottom side will be interrupted.

OPERATION • When the arm is in the digging process, the bottom side pressure B of the arm cylinder (1) will rise, close the check valve (3) and interrupt the circuits on the head side and the bottom side.

10-62

1. Arm cylinder 2. Arm spool 3. Check valve A : Head circuit (pressure) B : Bottom circuit (pressure) PP : Pump circuit (pressure)

PC130-7


CLSS

TRAVEL JUNCTION VALVE

(L.H. and R.H. travel junction circuit) 1. When traveling straight

10-64

PC130-7


CLSS

FUNCTION • When the L.H. and R.H. travel spool is operated to compensate flow errors in the L.H. and R.H. travel circuits during straight travel, the junction circuit will open. • Then, the flows to the L.H. and R.H. travel motors will become the same during the straight travel, and travel deviation will decrease. • At the time of steering, load pressure difference brings back the pressure reducing valve of the travel valve inside the steering and closes the spool notch opening of the travel junction valve to close the junction circuit for steering. OPERATION • When the L.H. and R.H. travel spool (1) is operated, the pump delivery will flow from the pump circuit PP to A through the actuator circuit PA. • When traveling straight, the actuator circuit PA will be equalized and the L.H. and R.H. pressure reducing valves (2) will be pressed the same stroke to the right. Then, the notch a and the junction circuit will open. • The L.H. travel forward oil pressure P1 and the R.H. travel forward oil pressure P2 are led to the spring chamber on the both end of the travel junction valve spool (4) through the respective shuttle valves (5). So, P1 = P2, and the spool is at the neutral position, and the notch d is ?open?. • Then, the L.H. and R.H. travel actuator circuits are interconnected with the junction circuit. When any difference occurs in the flows to the L.H and R.H. travel motors, this valve will compensate them and will reduce occurrence of travel deviations.

PC130-7

10-65


CLSS

2. When operating travel steering

10-66

PC130-7


CLSS

OPERATION • When the L.H. travel spool (L.H. 1) is returned to the neutral side from the straight traveling state and the steering is operated, there will occur any difference in the load pressures in the L.H. and R.H. travel actuator circuits PA (R.H. A > L.H. A). The LS pressure PLS will become the same as the R.H. A on the higher load pressure side. • Therefore, the flow control valve on the L.H. travel side is pressed to the left side with the LS pressure PLS, i.e., the load pressure on the R.H. travel side, and the notch a closes to interrupt the L.H. and R.H. travel circuits. Also, since the pressures in the spring chambers on the both ends of the travel junction valve spool (4) become different and P1 becomes higher than P2, the spool (4) moves to the P1 side and the notch d closes. Then, the steering can be operated. • The damper is provided to relax the transition characteristics of the junction circuit at the time of abrupt operation.

PC130-7

10-67


CLSS

TRAVEL LS BYPASS CIRCUIT 1. At normal operation

10-68

PC130-7


CLSS

FUNCTION • When an actuator is operated during travel, this circuit will increase the discarded throttled flow of the LS circuit PLS, loosen the pressure compensation accuracy of the travel circuit and limits reduction of the travel speed to small extent. • The bypass circuit is closed in case of independent travel or independent operation of an actuator. OPERATION • When the boom spool (1) is operated, the LS circuit PLS will come to the same pressure as the boom circuit pressure A1. • At the same time, the LS circuit pressure PLS is led to the spring chamber PLS1 of the pressure reducing valve (2) of the travel valve. • Since the travel spool is not operated, the travel actuator circuit PA is closed and the check valve (4) inside the flow control valve (3) is also closed. • Therefore, the travel LS bypass circuit is closed in case of independent operation of the boom.

PC130-7

10-69


CLSS

2. At operation of travel + other actuator

10-70

PC130-7


CLSS

OPERATION • When the boom spool (1) is operated, the LS circuit PLS will come to the same pressure as the boom circuit pressure A1. • Since the actuator circuit pressure is generally higher at boom RAISE than during travel (A1 > A2), the pressure in the spring chamber PLS1 of the flow control valve (3) on the travel side is higher than the travel circuit pressure PA. • So, the pressure reducing valve (2) moves to the left side, and the LS pressure of the spring chamber PLS1 pushes the check valve (4) from the orifice a to open it and flows to the travel circuit PA through the passages b and c. • Therefore, when the LS circuit pressure PLS, which has been as high as the boom circuit pressure A1, flows to the travel circuit A2, the pressure will drop.

PC130-7

10-71


CLSS

3. At simultaneous operation of boom + swing FUNCTION • When the boom is raised at the time of swinging, the swing pool stroke will be controlled and the flow to the boom will be distributed more to raise the boom more. 1) When the boom is not raised

OPERATION • Since the SA and SB ports are interconnected to the drain and no force is given to the piston (2), the stroke of the spool (1) is not controlled. So, the spool (1) comes to the cases (4) and (5) and the stroke increases by ST1. This increases the filtering oil flow.

10-72

1. 2. 3. 4. 5.

Spool (swing) Piston Plug Case Case

ST1 : Spool stroke

PC130-7


CLSS

2) At simultaneous operation of boom RAISE

OPERATION • When the boom RAISE PPC pressure is led to the piston (2) as the stroke control pilot pressure PS through the SA and SB ports, the piston (2) will be pressed in the inner direction. • At the time, the maximum stroke of the spool (1) will shorten (by ST0) due to control of the piston (2). Boom RAISE OFF ST1 > Boom RAISE ON ST0 • The spool (1) stroke is controlled and shortens. If the boom is raised at the time of swing (hoist swing), the notch a opening area will decrease. So, the flow distribution to the boom will increase and the boom will rise higher at the time of hoist swing.

PC130-7

10-73


CLSS

SWING BLEED VALVE FUNCTION • For swing operation, a bleed valve is provided to the pressure reducing valve to raise the LS pressure slowly and to smooth the swing operation. 1. Swing at neutral position

OPERATION • Since the notch a of the pressure reducing valve (1) and the LS circuit are closed and the bleedoff circuit and the LS circuit are also closed, the LS pressure PLS is not affected by operation of other work equipment. • The pump discharge pressure PP is also interrupted from the bleed-off circuit with the piston (2) and is not affected. • The notch b of the bleed spool (3) and the bleedoff circuit are interconnected each other.

10-74

PC130-7


CLSS

2. At swing fine control

OPERATION • The pressure reducing valve moves in the right direction, and the notch a and the LS circuit interconnect each other. Also, the pump circuit PP, the bleed-off circuit and the LS circuit interconnect each other through the piston (2). • The bleed spool (3) moves in the left direction in proportion to raise of the swing PPC pressure PA. But the notch b throttles and interconnect to the bleed-off circuit in the fine control region and determines the intermediate pressure before the pump discharge pressure PP is reduced and applied to the LS pressure PLS. • Therefore, the intermediate pressure is set lower than the pump discharge pressure PP and rises as the bleed spool (3) moves . So, the LS pressure PLS rises slowly.

PC130-7

10-75


CLSS

3. At full swing operation

OPERATION • When the swing PPC pressure PA comes to the maximum, the notch b of the bleed spool (3) interrupt the bleed-off circuit. The intermediate pressure becomes equal to the pump discharge pressure PP, and the LS pressure PLS becomes equal to the actuator circuit pressure.

10-76

PC130-7


CLSS

LS SELECT VALVE FUNCTION • At the time of simultaneous operation of swing + boom RAISE, this valve prevents high swing LS pressure from entering the LS circuit PLS and also prevents the boom RAISE speed from reducing by securing the pump flow at the time of swing drive. 1. During normal operation

OPERATION • The pilot pressure is not generally applied to the pilot port BP except for boom RAISE operation. • In this state, the pump discharge pressure PP pushes the valve (1) to open it and is led to the pressure reducing valve (4) of the swing valve. At the time of swing operation, there occurs the LS pressure PLS suitable for the load pressure, and the pressure is led to the pump LS valve.

PC130-7

10-77


CLSS

2. At simultaneous operation of swing + boom RAISE

OPERATION • At the simultaneous operation of swing + boom RAISE, the signal pressure of the PPC circuit is led to the pilot port BP. • When this pilot pressure BP is applied to the piston (2) and reaches a pressure that is stronger than the spring (3), the piston (2) will be pushed to the left side, the valve (1) will close and the pump discharge pressure PP will not come to flow to the pressure reducing valve (4) of the swing valve. • Then, the swing pressure does not cause LS pressure PLS, but the LS pressure PLS cause the boom RAISE pressure is led to the pump LS valve, and the pump delivery is controlled with the boom RAISE LS pressure. • The pilot pressure BP depends on the control lever stroke.

10-78

PC130-7


SELF PRESSURE REDUCING VALVE


P1 : From pump PR : Supply to solenoid valve, PPC valve and EPC valve. T : To hydraulic tank

PC130-7

10-79


1. 2. 3. 4. 5. 6.

Control valve block Valve (sequence valve) Spring Screw Poppet Spring (pressure reducing valve pilot)

10-80


7. 8. 9. 10. 11.

Spring (pressure reducing valve main) Valve (pressure reducing valve) Spring (safety valve) Ball Filter

PC130-7



FUNCTION • The self pressure reducing valves reduces the discharge pressure of the main pump and supplies it to the solenoid valve, the PPC valve, etc. as the control pressure.

PC130-7

10-81



1. At engine stop (total low pressure)

OPERATION • The spring (6) pushes the poppet (5) t the seat, and the circuit between the ports PR and T is closed. • The spring (7) pushes the valve (8) to the left side, and the circuit between the ports P1 and PR is open. • The spring (3) pushes the valve (2) to the left side, and the circuit between the ports P1 and P2 is closed.

10-82

PC130-7



2. At neutral and reduction of load pressure P2 (at own weight fall in boom LOWER and arm IN) Note : When the load pressure P2 is lower than the output pressure PR of the self pressure reducing valve.

OPERATION • The spring (3) and the PR pressure (0 MPa {0 kg/cm2} at the time of engine stop) pushes the valve (2) in the direction to close the circuit between the ports P1 and P2. When the hydraulic oil enters the P1 port, the expression (P1 pressure Spring (7) force + ( d area x PR pressure)) holds, and the self pressure reducing valve will adjust the openings of the ports P1 and P2 so that the P1 pressure can be maintained higher than the PR pressure. • When the PR pressure rises above the set pressure, the poppet (5) will open and the hydraulic oil flows through the route from the PR port, the hole a in the spool (8), the poppet (5) opening to the tank port T.

PC130-7

•

Therefore, there will occur a differential pressure around the hold a in the spool (8) and the spool will move in the direction to close the port P1 and the PR opening. Then, the P1 pressure is reduced and adjusted to a certain pressure (set pressure) with the opening and is supplied as the PR pressure.

10-83



3. At raise of load pressure P2

OPERATION • When the load pressure P2 rises due to digging or other operations, the pump delivery will increase and the P1 pressure will rise. Then, the expression (P1 pressure > Spring (7) force + ( d area x PR pressure)) will hold, and the valve (2) will move to the right side till the stroke end. As a result, the opening between the ports P1 and P2 will increase, the passage resistance will become smaller to reduce engine loss horsepower. • When the PR pressure rises above the set pressure, the poppet (5) will open and the hydraulic oil will flow through the route from the PR port, the hole a in the spool (8), the poppet (5) opening to the tank port T.

10-84

•

Therefore, there will occur a differential pressure around the hold a in the spool (8) and the spool will move in the direction to close the port P1 and the PR opening. Then, the P1 pressure is reduced and adjusted to a certain pressure (set pressure) with the opening and is supplied as the PR pressure.

PC130-7



4. At occurrence of abnormal high pressure

OPERATION • When the PR pressure of the self pressure reducing valve rises abnormally high, the ball (10) will separate from the seat against the spring (9) force to flow the hydraulic oil to the output ports PR T so as to reduce the PR pressure. Then, the equipment (PPC valve, solenoid valve, etc.), to which the oil pressure is supplied, is protected from the abnormal high pressure.

o

PC130-7

10-85


CENTER SWIVEL JOINT

CENTER SWIVEL JOINT

1. 2. 3. 4. 5.

Cover Body Slipper seal O-ring Shaft

10-86

A1 : A2 : B1 : B2 : C1 : C2 : D1 : D2 : E1 : E2 : DR1 : DR2 :

From control valve (R.H. travel Forward) To R.H. travel motor B From control valve (L.H. travel Forward) To L.H. travel motor A From control valve (R.H. travel Reverse) To R.H. travel motor A From control valve (L.H. travel Reverse) To L.H. travel motor B 2-stage travel selection solenoid valve To L.H./R.H. travel motor D To hydraulic tank From L.H. travel motor C1 and R.H. travel motor C2

PC130-7


TRAVEL MOTOR

TRAVEL MOTOR (FINAL DRIVE)

A : From control valve (L.H./R.H. travel) B : From control valve (L.H./R.H. travel) C1 : To hydraulic tank (L.H. travel motor) Plug (R.H. travel motor) C2 : Plug (L.H. travel motor) To hydraulic tank (R.H. travel motor) D : From travel 2nd speed selector solenoid valve

PC130-7

10-87


1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.

Plug Check valve spring Check valve Return spring Counterbalance valve Safety valve Safety valve spring End cover Regulator valve Spring Brake piston Cylinder Spring Swash plate Pivot Crankshaft RV gear A

10-88

TRAVEL MOTOR

18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34.

RV gear B Cover Driven gear Drive gear Drain plug Hub Regulator piston Spindle Piston Floating seal Plate Disc Valve plate Spring Piston Plug Check valve

PC130-7


TRAVEL MOTOR

SPECIFICATION Type Theoretical delivery (cm3/rev{cc/rev}) Rated speed (rpm)

GM18VL3 Hi

33.2 {33.2}

Lo

52.7 {52.7}

Hi

3,562

Lo

2,291

Brake releasing pressure (MPa{kg/cm2})

0.68 {6.94}

Hi-Lo switching pressure (MPa{kg/cm2})

2.94 {30}

Final drive reduction ratio

66

OUTLINE Travel speed selection

• •

Swash plate (14) has 2 faces (x, y) behind it, and is supported by pivot(15). When pressure of comtrol chamber a rises, it pushes regulator piston (24), them swash plate angle becomes minimum, then travel speed goes high.

PC130-7

10-89


TRAVEL MOTOR

OPERATION Operation of motor At slow speed (the motor swash plate angle is maximized.)

•

• •

•

•

Since the travel 2nd speed selector solenoid valve is demagnetized, the pressurized oil from the main pump does not flow to the D port. Therefore, the spring (10) has pressed the regulator valve (9) to the left side. So, the regulator valve (9) stops the main pressurized oil led from the control valve to the end cover by pushing the check valve (34). The pressurized oil in the control chamber drains in the motor case through the passage b of the regulator valve (9). Then, the main pressurized oil from the cylinder c chamber pushes the swash plate (14) in the direction to maximize the swash plate angle and the motor capacity is increased to the maximum for slow speed travel.

10-90

PC130-7


TRAVEL MOTOR

At high speed (the motor swash plate angle is minimized.)

•

•

•

When the travel 2nd speed selector solenoid valve is energized, the pilot pressure from the main pump will flow in the D port and push the regulator valve (9) in the right direction. Therefore, the main pressurized oil from the control valve passes through the passage b of the regulator valve (9), flows in the control chamber a and pushed the regulator piston (24) in the left direction. Then, the swash plate (14) is pressed in the direction to minimize the swash plate angle, and the motor capacity is minimized for high speed travel.

PC130-7

10-91


TRAVEL MOTOR

Operation of brake valve • The brake valve consists of the check valves (3a) and (3b), the counterbalance valve (5) and the safety valve (6), and the circuit configuration is as per the right figure. • Functions and operations of these components are as follows :

Counterbalance valve, check valve Function • When traveling down a slope, the own weight falling force will make the machine travel faster than the motor rotation. So, traveling with reduced engine speed is very dangerous because the motor idles and runs away. These valves let the machine travel at a speed appropriate for the engine speed (pump delivery) to prevent this danger. Operation at oil supply • When the travel lever is operated, the pressurized oil from the control valve will be supplied to the PA port, push and open the check valve (3a) and flow from the MA port on the motor inlet side to the MB port on the motor outlet side. Since the motor outlet circuit is closed with the check valve (3b) and the counterbalance valve (5), however, the supply-side pressure will rise.

10-92

PC130-7


•

TRAVEL MOTOR

The pressurized oil on the supply side flows in the S1 chamber from the orifice E1 of the counterbalance valve (5). When the pressure in the S1 chamber rises above the switching pressure of the counterbalance valve, the counterbalance valve (5) will be pressed in the right direction. So, the circuit between the outlet side MB port and the PB port will open, the motor outlet circuit will open, and the motor will start rotating.

Brake operation at traveling downhill • If the machine is going to run away when traveling downhill, the motor will idle to reduce the oil pressure on the motor inlet side and the pressure in the S1 chamber through the orifice E1. When the pressure in the S1 chamber drops below the switching pressure of the counterbalance valve, the counterbalance valve (5) will be returned in the left direction with the return spring (4), and the outlet side MB port will be throttled. Then, the pressure on the outlet side will rise and rotation resistance will occur to the motor to prevent the machine from running away. This means that the counterbalance valve (5) moves to a position where the machine own weight and the inlet side pressure balance with the pressure at the outlet side MB port, and the outlet circuit is throttled to control the speed to the pump delivery.

PC130-7

10-93


TRAVEL MOTOR

Safety valve Function • When stopping a travel (or traveling downhill), the counterbalance valve (5) will close the inlet and outlet circuits of the motor. Since the motor keeps rotating by inertia, however, the pressure on the outlet side of the motor will rise abnormally and the motor and pipes may be damaged. Then, the safety valve leads the abnormally high pressure to the inlet side of the motor to prevent the equipment from being damaged. Operation • When the pressurized oil being supplied from the PA port is stopped flowing at the time of travel stop, the return spring (4) will return the counterbalance valve (5) from the right side to the left side (the neutral position). • Though the counterbalance valve (5) closes the a chamber on the outlet side circuit, the inertia lets the motor rotate and the pressure in the a chamber rises. • The highly pressurized oil in the a chamber passes through the throttle b of the safety valve (6a) and enters in the d chamber from the c chamber. The pressurized oil entered in the d chamber moves the piston (32) to the left side. Meantime, the safety valve (6a) is pushed to open by the pressurized oil in the a chamber, and the pressurized oil in the a chamber flows in the f chamber through the e port. Therefore, the pressurized oil in the a chamber flows in the f chamber at a comparatively slow speed to control the pressure in the a chamber and also to prevent cavitation in the f chamber at the same time. • When the piston (32) reaches the stroke end, the pressures in the d and c chambers will rise, the safety valve (6a) will be closed again and the pressure in the a chamber will rise further. • Then, the safety valve (6b) will open and the pressurized oil in the a chamber will flow in the f chamber from the g chamber. The pressure in the a chamber can be controlled in two stage as mentioned above, and the hydraulic motor can be smoothly braked to stop.

10-94

PC130-7


TRAVEL MOTOR

Operation of parking brake When operating travel • When the travel lever is operated, the pressurized oil from the pump will work on the counterbalance valve (5), open the circuit a to the parking brake and flow in the b chamber of the brake piston (11). • The pressure in the b chamber overcomes the spring (31) and pushed the brake piston (11) in the left direction. • This will eliminate the press force to the plate (28) and the disc (29), and the plate (28) and the disc (29) will separate, and the brake force will be released.

When positioning travel neutral • When the travel lever is brought to the neutral position, the counterbalance valve (5) will return to the neutral position and the circuit a to the parking brake will be closed. • The pressurized oil in the b chamber of the brake piston (11) will be drained in the case, and the spring (31) will push the brake piston in the right direction. • Therefore, the plate (28) and the disc (19) will be pushed to each other, and the brake will come to work.

PC130-7

10-95


SWING MOTOR

SWING MOTOR TYPE : KMF40ABE-3

B S T MA MB

: : : : :

From swing brake solenoid valve From control valve To tank From control valve From control valve

10-96

SPECIFICATION Type : KMF40ABE-3 Theoretical delivery : 40.2 cc/rev Safety valve set pressure : 27.5 MPa {280 kg/cm2} Rated speed : 2,413 rpm Brake releasing pressure :1.77 MPa{18.0 kg/cm2}

PC130-7


1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Drive shaft Spacer Case Disc Plate Brake ring Brake piston Housing Reverse prevention valve Center spring

PC130-7

SWING MOTOR

11. 12. 13. 14. 15. 16. 17. 18. 19. 20.

Cylinder Valve plate Piston Center shaft Safety valve Check valve Check valve spring Shuttle valve Shuttle valve spring Brake spring

10-97


SWING MOTOR

SWING BRAKE 1. When solenoid valve is demagnetized Operation • When the solenoid valve of the swing brake is demagnetized, the pressurized oil from the control pump will be interrupted and the B port will be connected to the tank circuit. • Then, the brake piston (7) will be pressed downward with the brake spring (8) and will push the disc (4) and the plate (5) to work the brake.

2. When solenoid valve is energized Operation • When the solenoid valve of the swing brake is energized, the valve will be changed over and the pressurized oil from the control pump will enter the B port and will flow in the brake chamber A. • The pressurized oil in the A chamber will push the brake spring (8) and the brake piston (7) will move upward. Then, the disc (4) and the plate (5) will separate to release the brake.

10-98

PC130-7


SWING MOTOR

REVERSE PREVENTION VALVE

1. 2. 3. 4. 5. 6. 7.

Valve body Spool (MA side) Spring (MA side) Plug (MA side) Spool (MB side) Spring (MB side) Plug (MB side)

MA : Port MB : Port T1 : Port T2 : Port

PC130-7

10-99


SWING MOTOR

Effect explanation drawing

10-100

PC130-7


SWING MOTOR

FUNCTION • This function is used for reducing swing back generated on a swing body that can result from factors such as inertia of the swing body, backlash and rigidity of the machinery system and compressibility of hydraulic oil. • This function helps preventing loose loads at the end of swing or cutting lead time (better positioning performance allows you to proceed to the next operation within a shorter time).

1. When MB port pressure is generated Operation • MB pressure is conducted to d room via the cutout. Utilizing difference of space (D1>D2), the pressure compresses the spring (6) and drives the spool (5) leftward to interconnect MB e. • Since MA pressure at this time is lower than the pressure set on the spring (3), the spool (2) is not moved and pressurized oil remains closed. Thus, the braking force is maintained.

o

2. When the motor is once stopped Operation • The motor is reverse rotated by charging pressure generated on the MB port (1st reverse rotation). • At this time, reversing pressure is generated on the MA port. MA pressure conducted to a room interconnects MA b by compressing the spring (3) and driving the spool (2) rightward. • The pressure is then conducted through drilled hole on the spool (5) to interconnect b f. Reversing pressure on the MA port is bypassed to the T port to disable the 2nd reverse rotation.

o

o

PC130-7

10-101


SOLENOID VALVE

SOLENOID VALVE FOR PPC LOCK, 2ND TRAVEL SPEED SELECT, SWING HOLD BRAKE AND 2-STAGE RELIEF SOLENOID VALVE.

1. 2. 3. 4.

PPC lock solenoid valve 2nd travel speed select solenoid valve Swing hold brake solenoid valve 2-stage relief solenoid valve

Solenoid valve 5. Push pin 6. Coil 7. Gauge 8. Spool 9. Block 10. Spring

A1 : To PPC valve A2 : To 2-stage relief valve A3 : To swing hold brake A4 : To 2nd travel speed select valve ACC : To accumulator P1 : From self-pressure reducing valve T : To hydraulic oil tank

Check valve 11. Plug 12. Spring 13. Plunger

10-102

PC130-7


SOLENOID VALVE

OPERATION When solenoid is "demagnetized" • The coil (6) remains demagnetized as long as signal current to it is stopped.. • Thus, the spool (8) is pushed leftward by the spring (10). • Since ports P to A are closed by this spool, flow of pilot oil pressure to the actuator is blocked. At the same time, oil from the actuator is lead from A port to T port, then drained to the hydraulic oil tank.

When solenoid is "magnetized" • The coil (6) is magnetized by signal current conducted to it. • Thus, the spool (8) is pushed rightward by the push pin (5). • As the result, pilot oil pressure is conducted from P port through the cage (7) and A port up the actuator. At the same time, T port is closed, thereby blocking flow of oil to the hydraulic oil tank.

PC130-7

10-103


PPC ACCUMULATOR

PPC ACCUMULATOR 1. 2. 3. 4. 5. 6.

Gas plug Shell Poppet Holder Bladder Oil port

SPECIFICATIONS Gas used : Nitrogen gas Gas capacity : 0.3 Charged gas pressure : 1.18 MPa (12 kg/cm2) at 80°C Maximum operating pressure : 6.86 MPa (70 kg/cm2)

l

10-104

PC130-7


PPC VALVE

PPC VALVE FOR SWING, WORK EQUIPMENT

P : From main pump P1 : Left : Arm OUT/Right : Boom LOWER P2 : Left : Arm IN/Right : Boom RAISE

PC130-7

P3 : Left : Swing RIGHT/Right : Bucket CURL P4 : Left : Swing LEFT/Right : Bucket DUMP T : To tank

10-105


1. 2. 3. 4. 5.

Spool Metering spring Centering spring Piston Disk

10-106

PPC VALVE

6. 7. 8. 9. 10.

Nut (for linking the lever) Joint Plate Retainer Body

PC130-7


PPC VALVE

OPERATION 1) At neutral • Ports A and B of the control valve and ports P1 and P2 of the PPC valve are connected to drain chamber D through fine control hole f in spool (1). (Fig. 1)

o

2) During fine control (neutral fine control) When piston (4) starts to be pushed by disc (5), retainer (9) is pushed; spool (1) is also pushed by metering spring (2), and moves down. When this happens, fine control hole f is shut off from drain chamber D, and at almost the same time, it is connected to pump pressure chamber PP, so pilot pressure oil from the main pump passes through fine control hole f and goes from port P1 to port A. When the pressure at port P1 becomes higher, spool (1) is pushed back and fine control hole f is shut off from pump pressure chamber PP. At almost the same time, it is connected to drain chamber D to release the pressure at port P1. When this happens, spool (1) moves up or down so that force of metering spring (2) is balanced with the pressure at port P1. The relationship in the position of spool (1) and body (10) (fine control hole f is at a point midway between drain hole D and pump pressure chamber PP) does not change until retainer (9) contacts spool (1). Therefore, metering spring (2) is compressed proportionally to the amount of movement of the control lever, so the pressure at port P1 also rises in proportion to the travel of the control lever. In this way, the control valve spool moves to a position where the pressure in chamber A (the same as the pressure at port P1) and the force of the control valve spool return spring are balanced. (Fig. 2)

PC130-7

10-107


PPC VALVE

3) During fine control (when control lever is returned) When disc (5) starts to be returned, spool (1) is pushed up by the force of centering spring (3) and the pressure at port P1. When this happens, fine control hole f is connected to drain chamber D and the pressure oil at port P1 is released. If the pressure at port P1 drops too far, spool (1) is pushed down by metering spring (2), and fine control hole f is shut off from drain chamber D. At almost the same time, it is connected to pump pressure chamber PP, and the pump pressure is supplied until the pressure at port P1 recovers to a pressure that corresponds to the lever position. When the spool of the control valve returns, oil in drain chamber D flows fine control hole f' in the valve on the side that is not working. The oil passes through port P2 and enters chamber B to fill the chamber with oil. (Fig. 3)

4) At full stroke When disc (5) pushes down piston (4), and retainer (9) pushes down spool (1), fine control hole f is shut off from drain chamber D, and is connected with pump pressure chamber PP. Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1, and pushes the control valve spool. The oil returning from chamber B passes from port P2 through fine control hole f' and flows to drain chamber D. (Fig. 4)

10-108

PC130-7


PPC VALVE

FOR TRAVEL

P T P1 P2

: : : :

From main pump To tank L.H reverse L.H forward

PC130-7

P3 : R.H reverse P4 : R.H forward P5 : Travel signal

10-109


1. 2. 3. 4.

Plate Body Piston Collar

10-110

PPC VALVE

5. 6. 7. 8.

Metering spring Centering spring Valve Pin

PC130-7


PPC VALVE

OPERATION 1. In the neutral mode • P1 and P2 ports of the operation valves A, B and PPC valve are connected to the drain room D via the fine control hole f on the spool (1).

2. In the fine control mode (neutral fine control) • As the piston (4) is pushed by the disk (5), the retainer (9) is pushed, too. At the same time, the spool (1) is also pushed down via the metering spring (2). • By this move, connection of the fine control hole f is switched from the drain room D to the pump pressure room PP, and pilot pressurized oil for the main pump is conducted from P1 port to A port. • As P1 port pressure increases, the spool (1) is pushed back. By this move, connection of the fine control hole f is switched from the pump pressure room PP to the drain room D, thereby relieving P1 port pressure. • As the result, the spool (1) moves up and down so that force of the metering spring (2) and P1 port pressure may be balanced. Positional relationship between the spool (1) and body (10) (fine control hole f is situated at mid point between the drain room D and pump pressure room PP) remains unchanged until the retainer (9) is contacted against the spool (1). • The metering spring (2) is, therefore, compressed in proportion to strokes of the operation lever. Thus, the P1 port pressure, too, increases in proportion to strokes of the operation lever. • As the result, the operation valve spool moves to the position where pressure of A room (the same as P1 port pressure) is balanced against force of the operation valve spool return spring.

o

PC130-7

10-111


PPC VALVE

3. In the fine control mode (when operation lever is shifted back to its original position) • As the disk (5) starts returning, the spool (1) is pushed up by force of the centering spring (3) and P1 port pressure. • By this move, the fine control hole f is connected to the drain room D and relieves pressurized oil of P1 port to it. • If P1 port pressure goes excessively low, the spool (1) is pushed down by the metering spring (2) and passage between the fine control hole f and the drain room D is shut down. And, almost at the same time, the hole is connected to the pump pressure room PP and starts supplying pump the pressure. This supply continues until the P1 port pressure is recovered to the level equivalent to the lever position. • When the operation valve spool returns, oil in the drain room D flows in through the fine control hole f' on the not moving side valve. Oil is then conducted via P2 port to the room B to fill it up.

4. In the full stroke mode • When the disk (5) pushes down the piston (4) and the retainer (9) pushes down the spool (1), connection of the fine control hole f is switched from the drain room D to the pump pressure room PP. • Thus, pilot pressurized oil from the control pump passes through the fine control hole f and conducted to A room via P1 port to push the operation valve spool. • Return oil from B room is conducted from P2 port to the drain room D via the fine control hole f'.

10-112

PC130-7


PPC VALVE

FOR SERVICE

1. 2. 3. 4. 5. 6. 7. 8. 9.

Spool Metering spring Centering spring Piston Lever Plate Retainer Body Filter

PC130-7

P T P1 P

: From self pressure reducing valve : To tank : To blade or service valve : To blade or service valve

10-113


PPC VALVE

OPERATION 1. In the neutral mode • P1 and P2 ports of the operation valves A, B and PPC valve are connected to the drain room D via the fine control hole f on the spool (1).

2. In the fine control mode (Neutral fine control) • As the piston (4) is pushed by the disk (5), the retainer (7) is pushed, too. At the same time, the spool (1) is also pushed down via the metering spring (2). • By this move, connection of the fine control hole f is switched from the drain room D to the pump pressure room PP, and pilot pressurized oil for the control pump is conducted from P1 port to A port. • As P1 port pressure increases, the spool (1) is pushed back. By this move, connection of the fine control hole f is switched from the pump pressure room PP to the drain room D, thereby relieving P1 port pressure. • As the result, the spool (1) moves up and down so that force of the metering spring (2) and P1 port pressure may be balanced. • Positional relationship between the spool (1) and body (8) (fine control hole f is situated at mid point between the drain room D and pump pressure room PP) remains unchanged until the retainer (7) is contacted against the spool (1). • The metering spring (2) is, therefore, compressed in proportion to strokes of the operation lever. Thus, the P1 port pressure, too, increases in proportion to strokes of the operation lever. • As the result, the operation valve spool moves to the position where pressure of A room (the same as P1 port pressure) is balanced against force of the operation valve spool return spring.

o

10-114

PC130-7


PPC VALVE

3. In the fine control mode (when the operation lever is shifted back to its original position) • As the lever (5) starts returning, the spool (1) is pushed up by force of the centering spring (3) and P1 port pressure. By this move, the fine control hole f is connected to the drain room D and relieves pressurized oil of P1 port to it. • If P1 port pressure goes excessively low, the spool (1) is pushed down by the metering spring (2) and passage between the fine control hole f and the drain room D is shut down. And, almost at the same time, the hole is connected to the pump pressure room PP and starts supplying pump the pressure. This supply continues until the P1 port pressure is recovered to the level equivalent to the lever position. • When the operation valve spool returns, oil in the drain room D flows in through the fine control hole f' on the not moving side valve. Oil is then conducted via P2 port to the room B to fill it up.

4. In the full stroke mode • When the disk (5) pushes down the piston (4) and the retainer (7) pushes down the spool (1), connection of the fine control hole f is switched from the drain room D to the pump pressure room PP. • Thus, pilot pressurized oil from the control pump passes through the fine control hole f and conducted to A room via P1 port to push the operation valve spool. • Return oil from B room is conducted from P2 port to the drain room D via the fine control hole f'.

PC130-7

10-115


WORK EQUIPMENT

WORK EQUIPMENT

1. 2. 3. 4. 5. 6. 7.

Bucket Link Bucket cylinder Arm Arm cylinder Boom Boom cylinder

10-116

PC130-7


AIR CONDITIONER PIPING

AIR CONDITIONER PIPING

A: B: C: D:

Hot air/cold air spurting port Internal air circulation port External air inlet Refrigerant checking port

1. 2. 3. 4.

Hot water inport piping Air conditioner compressor Condenser Refrigerant piping

PC130-7

5. 6. 7. 8.

Receiver tank Hot water return piping Air conditioner unit Duct

10-117


ENGINE CONTROL

ENGINE CONTROL

1. 2. 3. 4. 5. 6. 7. 8. 9.

Starting switch Fuel control dial Governor motor Starting motor Linkage Battery relay Battery Engine throttle and pump controller Fuel injection pump

10-118

OUTLINE • The engine can be started and stopped with only starting switch (1). • The engine throttle and pump controller(8) reveives the signal of fuel control dial (2) and transmits the drive signal to governor motor (3) to control the governor lever angle of fuel injection pump (9) and control the engine speed.

PC130-7


ENGINE CONTROL

1. OPERATION OF SYSTEM Starting engine • When the starting switch is turned to the START position, the starting signal flows to the starting motor, and the starting motor turns to start the engine. When this happens, the engine throttle and pump controller checks the signal from the fuel control dial and sets the engine speed to the speed set by the fuel control dial.

Engine speed control • The fuel control dial sends a signal to the engine throttle and pump controller according to the position of the dial. The engine throttle and pump controller calculates the angle of the governor motor according to this signal, and sends a signal to drive the governor motor so that it is at that angle. When this happens, the operating angle of the governor motor is detected by the potentiometer, and feedback is sent to the engine throttle and pump controller, so that it can observe the operation of the governor motor.

Stopping engine • When the starting switch is turned to the STOP position, the engine throttle and pump controller drives the governor motor so that the governor lever is set to the NO INJECTION position. • When this happens, to maintain the electric power in the system until the engine stops completely, the engine throttle and pump controller itself drives the battery relay.

PC130-7

10-119


ENGINE CONTROL

2. COMPONENT Fuel control dial 1. 2. 3. 4. 5. 6.

Knob Dial Spring Ball Potentiometer Connector

FUNCTION • The fuel control dial is installed under the monitor panel, and a potentiometer is installed under the knob. The potentiometer shaft is turned by turning the knob. • As the potentiometer shaft is turned, the resistance of the variable resistor in the potentiometer changes and a throttle signal is sent to the engine throttle and pump controller. The hatched area in the graph shown at right is the abnormality detection area.

10-120

PC130-7


ENGINE CONTROL

GOVERNOR MOTOR

1. 2. 3. 4. 5. 6. 7. 8.

Potentiometer Cover Shaft Dust seal Bearing Motor Gear Connector

OPERATION While motor is stopped • Electric power is applied to both phases A and B of the motor. While motor is running • The engine throttle and pump controller supplies a pulse current to phases A and B, and the motor revolves, synchronizing to the pulse.

FUNCTION • The motor is turned according to the drive signal from the engine throttle and pump controller to control the governor lever of the fuel injection pump. This motor used as the motive power source is a stepping motor. • A potentiometer for feedback is installed to monitor the operation of the motor. • Revolution of the motor is transmitted through the gear to the potentiometer. PC130-7

10-121


ELECTRIC CONTROL SYSTEM

ELECTRIC CONTROL SYSTEM CONTROL FUNCTION

1 Engine/Pump composite control function

2 Pump/Valve control function

3 One-touch power maximizing function

4 Auto-deceleration function

5 Electric control system

Auto-warm-up/Overheat prevention function

6 Swing control function

7 Travel control function

8 ATT flow control, circuit selector function (if equipped)

Self-diagnosis function

10-122

PC130-7



MACHINE CONTROL SYSTEM DIAGRAM

10-124

PC130-7


PC130-7


10-125



1. ENGINE AND PUMP CONTROL FUNCTION

10-126

PC130-7



FUNCTION • This function is for selecting any of the three working modes "A," "B", "E" and "L" with the working mode selector switch on the monitor panel. The controller can select optimum engine torques or pump absorption torques for works to be expected. •

The controller detects the engine governor speed set with the fuel control dial depending on the pump absorption torque set in each mode and detects actual engine speeds. Then, the controller controls all torques at each output point of the engine so that the pump can absorb them.

•

When an engine speed was lowered, the controller prevents the engine from stopping by throttling the pump absorption toque.

PC130-7

10-127


1. CONTROL METHOD IN EACH MODE Mode A • Matching point in Mode A • When a load to the pump increases and the pressure rises and the engine speed lowers. At the time, the controller reduces the pump delivery so that the speed lowers to the speed at the full output point or so. If the pressure drops on the contrary, the controller increases the pump delivery so that the speed comes to the speed at the full output point or so. The controller repeats these controls so that the engine can always be used at speeds at the full output point or so.

10-128


A Travel (A1)

66.2 kW/2,200 rpm {88.7 HP/2,200 rpm}

A Work (A2)

65.5 kW/2,200 rpm {87.8 HP/2,200 rpm}

PC130-7



Mode E / Mode B / Mode L Mode Partial output point

Model

E

B

L

90%

90%

56%

PC130-7

Mode E

58.8 kW/2,000 rpm {78.9 HP/2,000 rpm}

Mode B

58.8 kW/2,000 rpm {78.9 HP/2,000 rpm}

Mode L

36.8 kW/1,500 rpm {70 HP/1,500 rtpm}

•

•

At this time, the controller keeps the pump absorption torque along the constant horsepower curve and lower the engine speed by the composite control of the engine and pump. By this method, the engine is used in the low fuel consumption area.

PC130-7

10-129



2. FUNCTION TO CONTROL PUMP DURING TRAVEL • If the machine travels in mode work A, B, E, or L, the working mode does not change, but the pump absorption torque and engine speed rise to travel A mode.

3. PUMP DRIVE IN AN EMERGENCY • Even if controllers and sensors get out of order, the emergency pump drive switch (S) will enable to maintain functions of the machine with absorption torques quite similar to those in the Mode E. In this case, a constant current flows from the battery to the PC-EPC valve, and the valve detects the oil pressure only. (1) Normal (2) Emergency

a

The emergency pump drive switch (S) is of the alternative type. If the machine is operated after the switch is set to "Emergency (2)" even though the machine is normal, the user code "E02" will be shown on the display.

10-130

PC130-7



2. PUMP/VALVE CONTROL FUNCTION

FUNCTION • The machine is matched to various types of work properly with the 2-stage relief function to increase the digging force, etc.

PC130-7

10-131



1) Cut-off function • When the cut-off function is turned on, the PC-EPC current is increased to near the maximum value. By this operation, the flow rate in the relief state is lowered to reduce fuel consumption. • Operating condition for turning on cut-off function. Condition •

The average value of the front and rear pressure sensors is above 27.9 MPa {285 kg/cm 2} and the one-touch power maximizing function is not turned on

The cut-off function does not work, however, while the machine is traveling in mode A, the lock switch is turned on. 2) 2-stage relief function • The relief pressure in the normal work is 31.9 MPa {325 kg/cm2}. If the 2-stage relief function is turned on, however, the relief pressure rises to about 34.8 MPa {355 kg/cm 2}. By this operation, the hydraulic force is increased further. • Operating condition for turning on 2-stage relief function Condition • • • •

During travel When swing lock switch is turned on When one-touch power maximizing function is turned on When L mode is operated

10-132

Relief pressure 31.9 MPa {325 kg/cm2}

⇓

34.8 MPa {355 kg/cm2}

PC130-7



3. ONE-TOUCH POWER MAXIMIZING FUNCTION

FUNCTION • Power can be increased for about 8.5 sec. by operating the left knob switch.

PC130-7

10-133



1) One-touch power maximizing function • When the operator needs more digging force to dig up a large rock, etc., if the left knob switch is pressed, the hydraulic force is increased about 9% to increase the digging force. • If the left knob switch is turned on in working mode "A" or "E", each function is set automatically as shown below.

⇓ Software cut-off function Working mode

Engine/Pump control

A, E

Matching at rated output point

10-134

2-stage relief function 31.9 MPa {325 kg/cm2}

⇓

34.8 MPa {355 kg/cm2}

Operation time Automatically Cancel reset at 8.5 sec

PC130-7



4. AUTO-DECELERATION FUNCTION

FUNCTION • If the all control levers are set in NEUTRAL while waiting for a dump truck or work, the engine speed is lowered to the medium level automatically to reduce the fuel consumption and noise. • If any lever is operated, the engine speed rises to the set level instantly.

PC130-7

10-135



OPERATION When control levers are set in neutral • If all the control levers are set in NEUTRAL while the engine speed is above the decelerator operation level (about 1,400 rpm), the engine speed lowers instantly to the first deceleration level about 100 rpm lower than the set speed. • If 4 more seconds pass, the engine speed lowers to the second deceleration level (about 1,400 rpm) and keeps at that level until any lever is operated again. When any control lever is operated • If any control lever is operated while the engine speed is kept at the second deceleration level, the engine speed rises instantly to the level set with the fuel control dial.

10-136

PC130-7



5. AUTO-WARM-UP/OVERHEAT PREVENTION FUNCTION

FUNCTION • After the engine is started, if the engine cooling water temperature is low, the engine speed is raised automatically to warm up the engine. If the engine cooling water temperature rises too high during work, the pump load is reduced to prevent overheating.

PC130-7

10-137



1) Auto-warm-up function • After the engine is started, if the engine cooling water temperature is low, the engine speed is raised automatically to warm up the engine. Operating condition (All)

Operated

⇒

Water temperature: Below 30°C. Engine speed: Max. 1,200 rpm

Engine speed: Max. 1,200 rpm

⇓ Resetting condition (Any one) Auto Manual

Water temperature: Above 30°C Auto-warm-up operation time: Min. 10 minutes

⇒

Engine speed: Any level

Fuel control dial: Kept at 70% of full level for 3 sec. or longer

Operating condition

Water and oil temperature: Above 105°C

Operation/Remedy

⇒

Operating condition



⇒

Water and oil temperature: Below 105?C

⇒

Work mode: Mode A, E, OR B Engine speed: Keep as is. Monitor alarm lamp: Lights up. Lower pump discharge.

⇒

Work mode: Mode A Engine speed: Keep as is. Lower pump discharge.

⇒

Work mode: Travel Engine speed: Keep as is. Lower travel speed.

• Under above condition, controller is set to condition before operation of function. (Manual reset)

Water and oil temperature: Below 102°C • Under above condition, controller is set to condition before operation of function. (Automatic reset) Resetting condition

⇒

Operation/Remedy

⇒

Fuel control dial: Return to low idle position once.

Resetting condition

Operation/Remedy

Operating condition


Work mode: Any mode Engine speed: Low idle Monitor alarm lamp: Lights up Alarm buzzer: Sounds

Resetting condition

Operation/Remedy

Operating condition

10-138

Reset

Water and oil temperature: Below 98°C • Under above condition, controller is set to condition before operation of function. (Automatic reset) Resetting condition

⇒

Water and oil temperature: Below 95°C • Under above condition, controller is set to condition before operation of function. (Automatic reset)

PC130-7



6. SWING CONTROL FUNCTION

1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Battery Battery relay Fusible link Starting switch Fuse box Controller Swing holding brake release switch Swing lock switch Monitor panel Swing holding brake solenoid valve

Input/Output Signals a. Controller power supply b. Solenoid power supply c. Monitor panel power supply d. S-NET signal

PC130-7

11. 12. 13. 14. 15. 16. 17. 18.

PPC lock solenoid valve Swing motor L.H. work equipment PPC valve Arm IN PPC oil pressure switch Swing PPC oil pressure switch Engine Hydraulic pump Control valve 18a. Self pressure reducing valve 18b. Main relief valve

e. Solenoid valve drive signal f. Swing PPC oil pressure switch signal g. Arm IN PPC oil pressure switch signal

10-139


FUNCTION Swing lock and swing holding brake • The swing lock (manual type) is for locking swing at optional positions. The swing holding brake (automatic type) interlocks with swing and prevents hydraulic drift from occurring after stop of swing. When the swing lock is released, only the hydraulic brake with the safety valve is effective for swing. So, note that, when a swing stops on a slope, a hydraulic drift may occur sometimes. Even during arm IN operation, release the swing holding brake.


Swing lock switch

a

OFF

Swing lock monitor

Function

The lamp Swing holding goes brake OUT.

• When the swing control lever is set to NEUTRAL, the swing holding brake works 4 sec. later. • When the swing control lever or the arm IN lever is operated, the swing holding brake is released and free swing becomes possible.

The lamp Swing turns ON. lock

• The swing holding brake works, and the swing is locked. • Even if the swing control lever is operated, the swing holding brake cannot be released, and no swing is possible.

a

ON

Release of swing holding brake • If the controller gets out of order and no swing is possible because the swing holding brake does not work normally, use the swing holding brake release switch (S), and the swing holding brake will be released and swing will become possible. (1) Normal (2) Release

a

Even if the swing holding brake release switch is set to "ON," the swing holding brake is not be released while the swing lock switch is set to "ON."

Operation

Swing ON holding (when the controller brake reis out of order) lease switch Swing lock switch

Swing brake

OFF (when the controller is in order)

ON

OFF

ON

OFF

The swing lock works.

The swing lock is released.

The swing lock works.

The swing holding brake works.

Input/Output signal time chart

10-140

PC130-7



7. TRAVEL CONTROL FUNCTION

1. 2. 3. 4. 5. 6. 7. 8. 9.

Battery Battery relay Fusible link Starting switch Fuse box Controller Monitor panel Travel speed selector solenoid valve L.H. travel motor

Input/Output signals a. Controller power supply b. Solenoid power supply c. Monitor panel power supply d. S-NET signal

PC130-7

10. 11. 12. 13. 14. 15.

R.H. travel motor Engine speed sensor Pump pressure sensor Engine Hydraulic pump Control valve 15a. Self pressure reducing valve 15b. Main relief valve

e. Solenoid valve drive signal f. Engine speed signal g. Pump pressure signal

10-141


FUNCTION Travel Speed Selection 1. Travel Speed "Manual" Change • When the travel speed selector switch is set to LOW or HIGH, the motor capacity changes and travel speeds can be selected.


Travel speed selector switch

LOW (low speed)

HIGH (high speed)

Motor capacity (cc/rev)

52.7

33.2

Travel speed (km/h)

2.7

5.5

Maximum

Minimum

ravel motor swash plate angle

2. "Automatic"change of travel speed 1) Automatic selection corresponding to engine speed • If engine speed drops to 1,500 rpm or less when travel speed selector switch is in HIGH and travel speed is HIGH, travel speed changes to LOW automatically. • If engine speed becomes 1,700 rpm or less when travel speed selector switch is in HIGH and travel speed is LOW, travel speed changes to HIGH automatically. If travel speed selector switch is in LOW, travel speed is not changed automatically.

a

2) Automatic selection corresponding to discharge pressure of pump • If travel pressure of 30.4MPa {310 kg/ cm 2} or higher continues for 0.2 seconds or more when travel speed selector switch is in HIGH, travel speed changes to LOW automatically. • If travel pressure of 16.7MPa {170 kg/ cm 2} or lower continues for 0.2 seconds or more when travel speed selector switch is in HIGH, travel speed changes to HIGH automatically. If travel speed selector switch is in LOW, travel speed is not changed automatically.

a

10-142

PC130-7



8. PPC LOCK FUNCTION

1. 2. 3. 4. 5. 6. 7. 8. 9.

Battery Battery relay Fusible link Starting switch Fuse box Controller Safety lock lever PPC lock switch PPC lock solenoid valve

10. 11. 12. 13. 14. 15. 16.

Left work equipment PPC valve Right work equipment PPC valve Traveling PPC valve Blade PPC valve (Blade specification) Engine Hydraulic pump Operation valve 16a. Self pressure reducing valve 16b. Man relief valve

Input/Output signals a. Power supply of controller b. Power supply of solenoids c. Solenoid valve driving signals

Function • PPC lock switch works with safety lock lever. Setting safety lock lever to "Lock", PPC lock switch turns to "OFF". • Turning PPC lock switch to "OFF" shuts off current to PPC lock solenoid valve, making operation lever on the work equipment disabled.

PC130-7

10-143



SELF DIAGNOSIS FUNCTION 1. Error code display/Alarm functions • Controller always watches electronic devices which constitutes the system, including controller itself, each potentiometer which issues input signals, each solenoid valve which receives output signals, and EPC valves, to check for they normal operation. • If an abnormality occurred in any of these devices, the controller diagnoses it and display the results on display (1) of monitor panel as a "USER CODE" or "SERVICE CODE", sounding alarm buzzer at the same time to notify the abnormality to operator. Refer to the "TROUBLESHOOTING" section as for the details of display and measures to be taken.

a

2. Error code memory function • Controller takes in memory the error code diagnosed about an abnormality which occurred in advanced system. Refer to the "TESTING AND ADJUSTING" section as for the details of display and how to reset.

a

10-144

PC130-7



SYSTEM COMPONENTS ENGINE SPEED SENSOR

FUNCTION • The engine speed sensor is installed on the ring gear of the engine flywheel. It electrically counts number of gear teeth that pass its front side and sends the counting to the controller.

1. 2. 3. 4. 5.

Magnet Terminal Case Boots Connector

Remarks : Number of ring gear teeth is 127. •

For the count, a magnet is used which generates current every time a gear tooth passes its front side.

PC130-7

10-145



PPC HYDRAULIC SWITCH

SPECIFICATION Contact structre : Normally opened Operating (ON) pressure : 490 ± 98.1 kPa {5.0 ± 1.0 kg/cm2} Resetting (OFF) pressure : 294 ± 49.0 kPa {3.0 ± 0.5 kg/cm2}

1. Plug 2. Switch 3. Connector

FUNCTION • 8 switches installed to junction block sense operating condetion of each actuator, and send it to controller. • 1 switch installed to travel PPC valve sense travel operating condition, and send it to controller.

10-146

PC130-7



CONTROLLER

PC130-7

10-147



Input/output signals CN-1

CN-2

Pin No.

Signal name

Input/ output

Pin No.

CN-3 Signal name NC

Input/ output

Pin No.

Output

1

Control power supply

Input Input

Signal name

1

NC

Input

1

2

NC

Input

2

Swing prolix switch

Input

2

Solenoid power supply

3

NC

Input

3

NC

Input

3

SOL_COM

4

Signal GND

5

NC

6 7 8

Input/ output

—

—

4

232C_RxD

Input

4

Battery relay drive

Output

Input

5

NC

Input

5

Motor drive a (+)

Output

NC

Input

6

6

LS_EPC

Output

Input

Over load caution enable switch

Input

Overload pressure sensor

Input

Output

Input

Machine select 4

NC

Pump pressure sensor

7

7

NC

Output

8

NC

Output

Input

8 9

NC

Output

10

NC

Input

11

NC

Output

12

CAN shield

13

Machine select 5

14

232C_TxD

15

NC

16

NC

Input

17

Machine select 3

Input

18

NC

Output

19

NC

Output

20

NC

Input

21

S_NET

22

CANO_L

23

CAN1_L

9

NC

10

Signal GND

—

11

Knob switch

Input

12

NC

Input

13

Feed back signal

Input

14

NC

Input

15

NC

Input

16

SENS_PWR

17

Start switch (C)

Input

18

NC

Input

19

Fuel dial

Input

20

NC

Input

21

Analog GND

Output

—

22

POT_PWR

23

Start switch (Acc)

Input

24

NC

Input

10-148

Output

— Input Output Input

Input/ Output Input/ Output Input/ Output

9

Bucket curl switch

Input

10

Boom ralse switch

Input

11

Control power supply

Input

12


Input

13

SOL_COM

—

14

Key signal

Input

15

Motor drive a (-)

Output

16

PC-EPC

Output

17

NC

Output

18

Heater relay solenoid

Output

19

Bucket dump switch

Input

20

Boom lower switch

Input

21

GND

22


23

SOL_COM

24

Key signal

25

Motor drive b (+)

— Input — Input Output

24

Flash memory write enable signal

Input

26

NC

Output

25

NC

Input

27

Travel speed solenoid

Output

26

NC

Input

28

2-stage rellef solenoid

Output

27

Machine select 2

Input

29

Swing switch

Input

28

NC

Input

30

Arm curl switch

Input

29

Puls GND

—

31

GND

—

30

NC

Input

32

GND

—

31

GND (S_NET GND)

—

33

GND

—

32

CAN0_H

34

NC

33

CAN1_H

Input/ Output Input/ Output

35

Motor drive b (-)

Output

34

GND (232C GND)

—

36

NC

Output

35

Service switch

—

37

Swing brake solenoid

Output

36

NC

Input

38

NC

Output

37

Machine select 1

Input

39

Travel switch

Input

38

Swing lock switch

Input

40

Arm dump switch

Input

39

Puls GND

40

Eng. speed

— Input

PC130-7



PUMP PRESSURE SENSOR

1. Plug 2. Sensor 3. Connector

FUNCTION • Mounted on the inlet circuit of control valve, this sensor changes discharging pressure of pump into voltage, and send it to automatic travel speed change controller.

Monitor panel Refer to the section describing the "Monitor System".

a

PC valve LS valve PC-EPC valve Refer to the section describing the "Hydraulic Pump (Piston pump)". LS-EPC valve Refer to the section describing the "Hydraulic Pump (Piston pump)".

a a

PPC lock solenoid valve 2nd speed select solenoid valve Swing hold brake solenoid valve 2-stage relief solenoid valve Refer to the section describing the "Solenoid Valve".

a

PC130-7

10-149


MONITOR SYSTEM

MONITOR SYSTEM

1. 2. 3. 4. 5.

Monitor panel Battery Controller Sensors and switches Wiper motor, window washer motor

Description • The monitor system monitors conditions of the machine with sensors mounted on its each section, processes promptly the information obtained, and displays it on panel to let operator know the conditions of the machine.

Input/Output signals a. Power supply b. Switch signal c. Caution signal d. Sensor/switch signal e. Sensor/switch signal f. Output for driving

10-150

PC130-7


MONITOR SYSTEM

MONITOR PANEL

OUTLINE • The monitor panel has the functions to display a monitor, gauge, service meter and electric system. It has also an alarm buzzer built in. • A CPU (Central Processing Unit) mounted inside processes, displays and outputs information.

Input/Output signals AMP070-12P [CN-P01] Pin No. 1 2 3 4 5 6 7 8 9 10 11 12

PC130-7

Signal name Starting switch (battery) Starting switch (battery) Window washer motor output Starting switch (C-terminal) Wiper W-contact GND GND VB + (24V) Wiper motor (+) Wiper motor (–) Alarm buzzer ON signal Wiper P-contact

•

•

The monitor's switch section consists of three flat type sheet switches. Pressing any of these switches changes the conditions of the machine, which are shown by LEDs located above the switches turned ON. The monitor does not give correct display if any of the monitor panel unit, controller, or the wiring between monitor-panel and controller is in abnormal condition.

AMP040-20P [CN-P02] I/O signal Input Input Output Input Input — — Input Output Output Input Input

Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Signal name Engine coolant temperature Fuel level Radiator coolant level NC Air cleaner clogging NC Engine oil pressure Engine oil level S-NET signal S-NET signal Battery charge level Hydraulic oil level GND (analog signal) NC Pull-up window limit switch Alarm buzzer cancel Swing lock Preheating Lamp switch GND (S-NET)

I/O signal Input Input Input Input Input Input Input Input Input/Output Input/Output Input Input — — Input Input Input Input Input —

10-151


MONITOR SYSTEM

METER DISPLAY

No. 1

Display category

Display item

Service meter

[*1] Display 2 3a Gauge 3b Caution

Coolant temperature

4a Gauge 4b Caution 5

6

Pilot

8 9

Caution

11 12

Display method

Time counting while engine is in operation (alternator is generating) (Always lit even if starting switch is OFF) Count time during engine operates. Alphanumerics in 2 Displays 2 digit alphanumerics (user code or digits service code) if electric control system is in abnormal condition. See picture above All the segments of the corresponding level and lower are turned ON. Specified tempera- (Level 8 (102°C or higher):Monitor lamp blinks. ture (102°C) or Level 9: Monitor lamp blinks and alarm buzzer higher sounds.) See picture above All the segments of the corresponding level and lower are turned on. (Level 1 (42 l or less): Specified level Monitor lamp blinks.) (42 l) or lower

Display Remarks color

0 – 99999.9 h

Blue

LCD

Red

LED

Blue

LCD

Red

LED

Turned on for about 30 seconds after starting switch was turned to "HEAT". It blinks (for about 10 seconds) after preheating was over to notify it to operator, and then it is turned off. • Turned on when the swing lock function is acWhen swing-lock is tive. Swing lock in operation • Blinks when swing holding brake release Green switch was turn on. • Turned ON when specified oil maintenance periods (125h, 250, and 500h) elapsed. (Also, When specified oilOil elapsed time and telephone No. of your dealmaintenance perimaintenance er are shown on service meter.) ods elapsed • Not turned on if no oil maintenance period has been specified. Engine oil level Max. low level Battery charge Charge in fault (charge voltage < level battery voltage) Turned ON when starting switch was turned on; Air cleaner turned off after engine started running. At clogging clogging In normal condition : turned OFF Red In abnormal condition : turned ON Lower than the Engine oil specified pressure (As for engine oil pressure, charge and over pressure 49 kPa {0.5 kg/cm2} load alarm buzzer sounds if the pressure became abnormal when engine was running.) Min. specified presOver load sure 16.7 MPa {170 kg/cm2} Preheating

[*2] 7

10

Fuel level

Display area

During preheating

Lamp

[*1] As for display and operation, refer to the "Self Diagnosis Function" section. [*2] As for display and operation, refer to the "Troubleshooting" chapter.

10-152

PC130-7


MONITOR SYSTEM

MONITOR SWITCH

No. 1

2

3

4

* 5

*

a

Name

Function

Operation

Used to select a travel speed from two of them. "Lo" is lit: Travel in low speed. Travel speed selector switch "Hi" is lit: Travel in high speed. Lo Hi Activates the function to reduce fuel consumption. Turned ON: The function is active. ON OFF Auto-deceleration switch Turned OFF: The function is not active. (Lit) Activates wiper of front glass. "ON" is lit: Wiper works continuously. OFF INT ON Wiper switch "INT" is lit: Wiper works intermittently. (Not lit) (Intermittent) (Continuous) Not lit: Wiper is not working. [When wiper is not working] ON : Washer fluid is sprayed and wiper works continuously. OFF : Wiper works twice and stops after the switch was released. [When wiper is working intermitWind washer switch Sprays washer fluid onto front glass. tently] ON : Washer fluid is sprayed and wiper works continuously. OFF : Wiper works twice and returns to intermittent operation after the switch was released. Sets the movement and force of the working equipment. "A" is lit: A mode (for heavy duty work) Operation mode selector A E L B "E" is lit: E mode (for fuel economical operation) switch "L" is lit: L mode (for fine control work) "B" is lit: B mode (for breaker work)

You can change the default settings which become active when starting switch is turned on. Refer to the "TROUBLESHOOTING" chapter. Signs written in bold fonts in the "Operation" column above represent the positions switches default to when starting switched is turned on.

PC130-7

10-153


MONITOR SYSTEM

SENSORS • • •

Signal from a sensor is directly entered to the panel. There are two types of sensors, contact type and resistance type. One end of a contact type sensor is connected to the ground on the machine body. Display class Caution Gauge

Sensor type Engine oil pressure Coolant temperature Fuel level Hydraulic oil temperature

Sensing approach Contact Resistance Resistance Resistance

When normal OFF (open) — — —

When failed ON (closed) — — —

ENGINE OIL PRESSURE SENSOR

1. Plug 2. Contact ring 3. Contact

4. Diaphragm 5. Spring 6. Terminal

COOLANT TEMPERATURE SENSOR HYDRAULIC OIL TEMPERATURE SENSOR

1. Connector 2. Plug 3. Thermistor

10-154

PC130-7


MONITOR SYSTEM

FUEL LEVEL SENSOR

1. 2. 3. 4.

Float Connector Cover Variable resisto

PC130-7

10-155

40 MAINTENANCE STANDARD

SWING MACHINERY .............................................................. 40- 2 SWING CIRCLE ...................................................................... 40- 4 TRACK FRAME, IDLER CUSHION......................................... 40- 5 IDLER ...................................................................................... 40- 6 CARRIER ROLLER ................................................................. 40- 7 TRACK ROLLER ..................................................................... 40- 8 SPROCKET ............................................................................. 40- 9 TRACK SHOE ......................................................................... 40-10 HYDRAULIC PUMP................................................................. 40-14 CONTROL VALVE ................................................................... 40-15 SUCTION SAFETY VALVE ..................................................... 40-24 SELF PRESSURE REDUCTION VALVE ................................ 40-25 TRAVEL MOTOR..................................................................... 40-26 SWING MOTOR ...................................................................... 40-27 SOLENOID VALVE .................................................................. 40-28 CENTER SWIVEL JOINT ........................................................ 40-29 PPC VALVE ............................................................................. 40-30 HYDRAULIC CYLINDER ......................................................... 40-34 WORK EQUIPMENT ............................................................... 40-36 DIMENSION OF WORK EQUIPMENT.................................... 40-38

PC130-7

40-1

MAINTENANCE STANDARD

SWING MACHINERY

SWING MACHINERY

40-2

PC130-7


SWING MACHINERY

Unit: mm No.

Check item

Criteria

Remedy

Standard clearance

Clearance limit

0.07 – 0.18

0.4

Backlash between No.1 sun gear and No.1 planetary gear.

0.13 – 0.31

0.6

3

Backlash between No.1 planetary gear and ring gear.

0.15 – 0.34

0.7

4

Backlash between No.1 planetary carrier and No.2 sun gear.

0.14 – 0.34

0.7

5

Backlash between No.2 sun gear and No.2 planetary gear.

0.13 – 0.31

0.6

6

Backlash between No.2 planetary gear and ring gear.

0.15 – 0.34

0.7

7

Backlash between No.2 planetary carrier and swing pinion.

0.08 – 0.19

0.4

8

Backlash between swing pinion and swing circle.

0.13 – 1.16

2.3

Standard size

Repair limit

9

Wear of swing pinion surface contacting with oil seal.

0

144.8

1

Backlash between swing motor shaft and No.1 sun gear.

2

PC130-7

145 - 0.1000

Replace

Apply hardchrome plating recondition, or replace

40-3


SWING CIRCLE

SWING CIRCLE

Unit: mm No.

1

40-4

Check item

Axial clearance of bearing

Criteria

Remedy

Standard clearance

Clearance limit

0.10 – 0.25

0.9

Replace

PC130-7


TRACK FRAME, IDLER CUSHION

TRACK FRAME, IDLER CUSHION

Unit: mm No.

1

2

Check item

Idler guide top and bottom width

Idler guide left and right width

Criteria Standard size

Clearance limit

Track frame

84

89

Idler support

82

77

Rebuild or replace

Track frame

185

193

Rebuild

Idler support

183

175

Rebuild or replace

Standard size 3

Recoil spring

PC130-7

Remedy

Rebuild

Repair limit

Free length

Installed length

Installed load

Free length

Installed load

502

390

84.3 kN {8,600 kg}

490

75.0 kN {7,650 kg}

Replace

40-5


IDLER

IDLER

Unit: mm No.

Check item

Criteria

Remedy

Standard size

Repair limit

527

—

Outer diameter of tread

489

477

3

Depth of protruding portion

19

25

4

Width of protruding portion

52

42

5

Total width

115

107

6

Width of tread

31.5

36.5

1

Outer diameter of protruding portion

2

7

Clearance between idler shaft and bushing

Standard size 54

8

Interference between idler and bushing

Standard size 61

9

Side clearance of idler (on one side)

10

Tread wall thickness (at center of tread)

40-6

Tolerance

Rebuild or replace

Shaft

Hole

Standard clearance

Clearance limit

– 0.250 – 0.280

+ 0.074 0

0.250 – 0.354

1.5

Tolerance Shaft

Hole

+ 0.117 + 0.087

+ 0.030 0

Standard in- Interference terference Replace limit 0.057 – 0.117

Standard clearance

Clearance limit

0.18 – 0.38

1.5

Standard size

Repair limit

15

9

—

Rebuild or replace

PC130-7


CARRIER ROLLER

CARRIER ROLLER

Unit: mm No.

Check item

1


2

Width of tread

3

Clearance between shaft and bushing


Repair limit

116

106

123

—

Standard size 40

4

Interference between collar and bushing

Standard size 47

5

Play on carrier roller in axial direction

6

Tread wall thickness (at 10 mm away from end face roller)

PC130-7

Remedy

Tolerance Shaft

Hole

Standard clearance

+ 0.055 – 0.035

+ 0.261 + 0.200

-0.145 – 0.226

Tolerance Shaft

Hole

+ 0.061 – 0.036

+ 0.025 0

Rebuild or replace —

Clearance limit — Replace

Standard in- Interference terference limit 0.011 – 0.061

Standard size

Repair limit

0.363 – 0.537

1.5

17.7

12.7

—

Rebuild or replace

40-7


TRACK ROLLER

TRACK ROLLER

Unit: mm No.

1

Check item

Criteria

Diameter of flange (outside)

Remedy

Standard size

Repair limit

158

—

2


130

120

3

Flange width

26.5

—

4

Total width

176

—

5

Width of tread

35

—

6

Clearance between shaft and bushing

Standard size 48

7

Interference between roller and bushing

Standard size 55

8

Track roller side clearance (on one side)

9

Tread wall thickness (at center of width)

40-8

Tolerance

Rebuild or replace

— Rebuild or replace

Shaft

Hole

Standard clearance

Clearance limit

– 0.250 – 0.350

+ 0.186 – 0.025

0.225 – 0.536

1.5

Tolerance Shaft

Hole

+ 0.190 + 0.110

+ 0.093 + 0.063

Standard in- Interference terference Replace limit 0.017 – 0.127

Standard clearance

Clearance limit

0.160 – 0.345

1.5

Standard size

Repair limit

37.5

32.5

—

Rebuild or replace

PC130-7


SPROCKET

SPROCKET

Unit: mm No.

Check item

Criteria

Remedy

Standard size

Tolerance

Repair limit

547.4

+ 1.0 – 2.0

535

Wear on addendum diameter

607

—

595

3

Wear on addendum width

27

—

22

4

Wear on tooth bottom width

42

± 1.5

39

5

Tooth bottom wall thickness

111.7

+ 0.465 – 1.160

105.5

1

Wear on tooth bottom diameter

2

PC130-7

Rebuild or replace

40-9


TRACK SHOE

TRACK SHOE TRIPLE SHOE, ROAD LINER, CITY PAD SHOE

a

1 Triple shoe and city pad shoe 2 Road liner P portion shows the link of bushing press fitting end.

40-10

PC130-7


TRACK SHOE

Unit: mm No.

1

Check item

Criteria

Link pitch

Standard size

Repair limit

175.25

178.25

Bushing outside diameter 46.3

3

Link height

4

Thickness of link metal (bushing pressfitting portion)

Turn of replace

When turned

Standard size 2

Remedy

Normal road

Impact road

—

42.3

Standard size

Repair limit

86

81

24

19

5

Rebuild or replace

102.4 Replace

6

Shoe bolt pitch

86.4

7

57

8 9

Inside diameter Link

10

52.4

Overall width

35

Tread width

30.1

11

Protrusion of pin

5.5

12

Protrusion of regular bushing

3.75

13

Overall length of pin

173

14

Overall length of bushing

86.7

15

Thickness of bushing metal

16

Thickness of spacer

17 18

Press fitting force

*19

Rebuild or replace

Adjust of replace

Standard size

Repair limit

7.8

3.8 —

Bushing

39.2 –137.2 kN {4 – 14 ton}

Regular pin

78.4 –186.3 kN {8 – 19 ton}

Master pin

39.2 – 98.1 kN {4 – 10 ton}

—

a The items marked * are for dry type track. PC130-7

40-11


TRACK SHOE

Unit: mm No.

Check item

Criteria

Remedy

Tightening torque (Nm {kgm}) Additional tightening angle (deg) a. Regular link Shoe bolt 20 b. Master link

Triple shoe City pad shoe

196 ± 20 {20 ± 2}

90 ± 10

Road liner

147 ± 10 {15 ± 1}

50 ± 5

Tightening torque (Nm {kgm})

Additional tightening angle (deg)

Lower limit torque (Nm {kgm})

—

—

—

No. of shoe (each side)

21

22

23

Interference between bushing and link

Interference between regular pin and link

Clearance between regular pin and bushing

43 Standard size

*24

*25

a

Height of grouser

Standard interference

46

+ 0.387 + 0.347

+ 0.062 0

0.285 – 0.387

30

+ 0.150 0

– 0.198 – 0.250

0.198 – 0.400

Standard size

Standard size

Standard size 30

26

Tolerance Hole

30

Clearance between master pin and bushing

—

Shaft

30

Interference between master pin and link

Retighten

a. Road liner

Tolerance

Standard clearance

Shaft

Hole

+ 0.150 0

– 0.830 – 0.330

0.180 – 0.830 Adjust or replace

Tolerance Shaft

Hole


+ 0.020 – 0.020

– 0.198 – 0.250

0.178 – 0.270

Tolerance


Shaft

Hole

– 0.200 – 0.300

+ 0.630 + 0.230

0.430 – 0.930

Standard size

Repair limit

58

21

Replace

The items marked * are for dry type track.

40-12

PC130-7


TRACK SHOE

RIPLE SHOE, CITY PAD SHOE

Unit: mm No.

Check item

1

Height of grouser

2

Overall height of shoe

3

Thickness

4 5


Repair limit

20

10

29.5

19.5 9.5 14

Length of grouser top

6

PC130-7

Remedy

Repair by build-up welding or replace

13 15

40-13


HYDRAULIC PUMP

HYDRAULIC PUMP

40-14

PC130-7


CONTROL VALVE

CONTROL VALVE (1/9)

PC130-7

40-15


CONTROL VALVE

(2/9)

Unit: mm No.

Check item


1

Suction valve spring

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

46.8 x 7.50

40.6

5.50±0.40N {0.56±0.04kg}

—

4.40 N {0.45 kg}

2


16.0 x 16.0

12.0

5.70 N {0.58 kg}

—

4.50 N {0.46 kg}

3

Piston spring

20.0 x 7.0

14.0

1.20 N {0.12 kg}

—

0.98 N {0.10 kg}

40-16

Replace spring if any damages or deformations are found

PC130-7


CONTROL VALVE

(3/9)

Unit: mm No.

Check item


1

Spool return spring

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

—

45.0

53.5 N {5.46 kg}

—

—

2

Spool return spring

—

45.0

55.9 N {5.70 kg}

—

—

3

Spool return spring

—

41.0

92.2 N {9.4 kg}

—

—

PC130-7


40-17


CONTROL VALVE

(4/9)

Unit: mm No.

Check item


1

Flow control valve spring

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

—

23.5

29.4 N {3 kg}

—

—

2

Pressure reduction valve spring

27.5 x 14.2

18.0

17.7±0.98N {1.80±0.10kg}

—

13.7 N {1.40 kg}

3


28.2 x 14.5

26.0

29.4±2.94N {3.0±0.30kg}

—

23.5 N {2.40 kg}

4


32.5 x 14.2

23

17.6 N {1.8 kg}

—

14.1 N {1.44 kg}

40-18


PC130-7


CONTROL VALVE

(5/9)

Unit: mm No.

Check item


1

Check valve spring

PC130-7

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

41.5 x 8.50

31.5

5.88 N {0.60 kg}

—

4.71 N {0.48 kg}


40-19


CONTROL VALVE

(6/9)

Unit: mm No.

Check item


1

Lift check valve spring Cooler bypass valve spring

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

72.7 x 20.6

42.5

135±4.90N {13.8±0.50kg}

—

113 N {11.5 kg}

2

Lift check valve spring

72.7 x 20.6

42.5

67.7 N {6.9 kg}

—

—

3

Bleed spool return spring

23.3 x 12.5

23.0

3.92±0.98N {0.40±0.10kg}

—

2.94 N {0.30 kg}

40-20


PC130-7


CONTROL VALVE

(7/9)

Unit: mm No.

Check item


1

Travel junction spool

PC130-7

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

17.7 x 8.20

13.0

13.7±0.10N {1.40±0.10kg}

—

10.1 N {1.10 kg}


40-21


CONTROL VALVE

(8/9)

Unit: mm No.

Check item


1

Check valve spring

40-22

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

41.5 x 8.50

31.5

5.88 N {0.60 kg}

—

4.71 N {0.48 kg}


PC130-7


CONTROL VALVE

(9/9)

PC130-7

40-23



SUCTION SAFETY VALVE FOR SERVICE VALVE

Unit: mm No.

Check item


1

2


Piston spring

40-24

Free length x O.D.

Remedy Repair limit

Installed length

Installed load

Free length

Installed load

9.50

2.06 N {0.21 kg}

—

1.57 N {0.16 kg}

16.3 x 21.3 20.0 x 7.0

14.0

2.06 N {0.21 kg}

—

1.57 N {0.16 kg}


PC130-7


SELF PRESSURE REDUCTION VALVE

SELF PRESSURE REDUCTION VALVE

Unit: mm No.

Check item


1

Spring (pressure reduction main)

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

19.2 x 7.20

16.1

19.6 N {2.0 kg}

—

17.7 N {1.80 kg}

2

Spring (pressure reduction valve pilot)

16.5 x 7.20

12.7

20.6 N {2.10 kg}

—

18.6 N {1.90 kg}

3

Spring

71.0 x 18.0

59.0

200 N {20.4 kg}

—

186 N {19.0 kg}

4

Spring (safety valve)

16.1 x 7.80

13.4

61.7 N {6.30 kg}

—

58.8 N {6.0 kg}

PC130-7


40-25


TRAVEL MOTOR

TRAVEL MOTOR GM18VL-3

40-26

PC130-7


SWING MOTOR

SWING MOTOR KMF40ABE-3

Unit: mm No.

Check item


1

2

Check valve spring

Shuttle valve spring

PC130-7

Free length x O.D.

Remedy Repair limit

Installed length

Installed load

Free length

Installed load

23.0

1.28 N {0.13 kg}

—

0.98 N {0.10 kg}

33.0 x 13.8 16.4 x 8.90

11.5

13.7 N {1.40 kg}

—

10.8 N {1.10 kg}


40-27


SOLENOID VALVE

SOLENOID VALVE FOR PPC LOCK, 2ND TRAVEL SPEED SELECTOR, SWING AND PARK BRAKE, AND 2STAGE RELIEF SOLENOID VALVE

40-28

PC130-7


CENTER SWIVEL JOINT

CENTER SWIVEL JOINT

Unit: mm No.

1

Check item Clearance between rotor and shaft

PC130-7

Criteria

Remedy

Standard size

Standard clearance

Clearance limit

80

0.056 – 0.105

0.111

Replace

40-29


PPC VALVE

PPC VALVE FOR SWING, WORK EQUIPMENT

Unit: mm No.

Check item


1

Centering spring (for P3 and P4 ports)

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

44.45 x 15.5

34.0

29.4 N {3.0 kg}

—

23.5 N {2.40 kg}

2

Centering spring (for P1 and P2 ports)

47.93 x 15.5

34.0

39.2 N {4.0 kg}

—

31.4 N {3.20 kg}

3

Metering spring

26.53 x 8.15

34.0

16.7 N {1.70 kg}

—

13.7 N {1.40 kg}

40-30


PC130-7


PPC VALVE

FOR TRAVEL

Unit: mm No.

Check item


1

2

Metering spring

Centering spring

PC130-7

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

6.5 x 8.15

24.9

16.7 N {1.70 kg}

—

13.7 N {1.40 kg}

48.1 x 15.5

32.5

108 N {11.0 kg}

—

86.3 N {8.80 kg}


40-31


PPC VALVE

FOR SERVICE

Unit: mm No.

Check item


1

2

Centering spring

Metering spring

40-32

Remedy Repair limit

Free length x O.D.

Installed length

Installed load

Free length

Installed load

42.4 x 15.5

28.4

207.8 N {21.2 kg}

—

167 N {17.0 kg}

2.7 x 8.10

22.0

16.7 N {1.70 kg}

—

13.3 N {1.36 kg}


PC130-7


HYDRAULIC CYLINDER

HYDRAULIC CYLINDER BOOM CYLINDER

ARM CYLINDER

BUCKET CYLINDER

40-34

PC130-7


HYDRAULIC CYLINDER

Unit: mm No.

Check item Cylinder

1

2

3

Clearance between piston rod and bushing

Clearance between piston rod support shaft and bushing

5

6

Cylinder piston tightening torque

Cylinder piston lock screw tightening torque

PC130-7

Tolerance Shaft Hole

Standard clearance

Clearance limit

70

– 0.030 – 0.076

+ 0.259 + 0.063

0.093 – 0.335

0.435

Arm

75

– 0.030 – 0.076

+ 0.279 + 0.065

0.095 – 0.355

0.455

Bucket

65

– 0.030 – 0.076

+ 0.250 + 0.055

0.085 – 0.326

0.426

Boom

70

– 0.030 – 0.100

+ 0.190 + 0.070

0.100 – 0.290

1.0

Arm

70

– 0.030 – 0.100

+ 0.190 + 0.070

0.100 – 0.290

1.0

Bucket

65

– 0.030 – 0.080

+ 0.170 + 0.070

0.100 – 0.250

1.0

Boom

70

– 0.030 – 0.100

+ 0.190 + 0.070

0.100 – 0.290

1.0

70

– 0.030 – 0.100

+ 0.190 + 0.070

0.100 – 0.290

1.0

65

– 0.030 – 0.080

+ 0.170 + 0.070

0.100 – 0.250

1.0

Clearance between cylinder bottom supArm port shaft and bushing Bucket

Cylinder head tightening torque

Standard size

Remedy

Boom

Boom 4

Criteria

Arm

Replace bushing

172 ± 24.5 Nm {17.5 ± 2.5 kgm} 270 ± 39 Nm {27.5 ± 4.0 kgm}

Bucket

172 ± 24.5 Nm {17.5 ± 2.5 kgm}

Boom

294 ± 29.4 Nm {30.0 ± 3.0 kgm}

Arm

294 ± 29.4 Nm {30.0 ± 3.0 kgm}

Bucket

294 ± 29.4 Nm {30.0 ± 3.0 kgm}

Boom

66.2 ± 7.4 Nm {6.75 ± 0.75 kgm}

Arm

66.2 ± 7.4 Nm {6.75 ± 0.75 kgm}

Bucket

30.9 ± 3.4 Nm {3.15 ± 0.35 kgm}

Re-tightening

40-35


WORK EQUIPMENT

WORK EQUIPMENT

40-36

PC130-7


WORK EQUIPMENT

Unit: mm No.

1

Check item

Clearance between connecting pin and bushing of revolving frame and boom.

Criteria Tolerance

Remedy

Shaft

Hole

Standard clearance

Clearance limit

70

– 0.030 – 0.100

+ 0.130 + 0.065

0.095 – 0.230

0.8

Standard size

2

Clearance between connecting pin and bushing of boom and arm.

70

– 0.030 – 0.100

+ 0.141 + 0.074

0.104 – 0.241

0.8

3

Clearance between connecting pin and bushing of arm and link.

60

– 0.030 – 0.080

+ 0.129 + 0.074

0.104 – 0.209

0.8

60

– 0.030 – 0.080

+ 0.135 + 0.074

0.104 – 0.215

0.8

65

– 0.030 – 0.080

+ 0.133 + 0.074

0.104 – 0.213

0.8

4 5

Clearance between connecting pin and bushing of arm and bucket. Clearance between connecting pin and bushing of link and bucket.

Replace

6

Clearance between connecting pin and bushing of link and link.

60

– 0.030 – 0.080

+ 0.130 + 0.074

0.104 – 0.210

0.8

7

Clearance between the blade and track frame mounting pin and bushing

70

– 0.030 – 0.100

+ 0.198 + 0.124

0.154 – 0.298

1.5

PC130-7

40-37


DIMENSION OF WORK EQUIPMENT

DIMENSION OF WORK EQUIPMENT ARM

40-38

PC130-7



Unit: mm No.

Measuring position

1

—

Standard size 70

Tolerance Shaft

Hole

– 0.030 – 0.100

+ 0.100 0

81.5

+ 1.0 0

Cylinder head side

80

± 1.2

Boom side

226

+ 0.5 0

Arm side

226

– 0.2 – 0.7

Arm side 2

3 – 0.030 – 0.100

+ 0.100 0

4

—

70

5

—

264

± 2.0

6

—

213.5

± 1.0

7

—

640.6

± 0.5

8

—

2,491

—

9

—

2,101.9

± 1.5

10

—

290.4

± 0.5

11

—

493

± 0.2

12

—

422

± 0.5

13

—

374.9

—

14

—

1,175.1

—

15

—

60

– 0.030 – 0.080

+ 0.200 0

Link side

259

0 – 0.1

Bucket side

261

± 1.0

16

17

—

60

– 0.030 – 0.080

+ 0.200 0

Arm side

226

0 – 0.5

Bucket side

274

—

Min.

1,378

—

Max.

2,263

—

18

19

PC130-7

40-39



BUCKET

40-40

PC130-7



Unit: mm No.

Measuring position

Standard size

Tolerance

1

—

371.3

± 0.5

2

—

51.6

± 0.5

3

—

97.9°

—

4

—

374.9

—

5

—

1241.6

—

6

—

190.2

—

7

—

5°

—

8

—

0°

—

9

—

60

+ 0.2 0

10

—

64

—

11

—

80

12

—

261

± 1.0

13

—

50

—

14

—

85

—

15

—

380

+ 1.0 0

16

—

18

—

17

—

110

—

18

—

130

—

19

—

132

—

20

—

108

—

21

—

274

—

22

—

51

—

23

—

34

—

24

—

104.2

—

25

—

119.6

—

26

—

74

—

27

—

65

—

PC130-7

+ 0.25 0

40-41

90 OTHERS

HYDRAULIC CIRCUIT DIAGRAM........................................... 90- 3 ELECTRICAL CIRCUIT DIAGRAM (1/4)................................. 90- 5 ELECTRICAL CIRCUIT DIAGRAM (2/4)................................. 90- 7 ELECTRICAL CIRCUIT DIAGRAM (3/4)................................. 90- 9 ELECTRICAL CIRCUIT DIAGRAM (4/4)..................................90-11

PC130-7

90-1

HYDRAULIC CIRCUIT DIAGRAM

PC130-7

90-3

ELECTRICAL CIRCUIT DIAGRAM (1/4)

PC130-7

90-5


PC130-7

90-7


PC130-7

90-9


PC130-7

90-11

PC130-7

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