04IMPL

Service Training MALAGA

320B/330B Hydraulic Excavators IV. IMPLEMENT & TRAVEL SYSTEM

The hydraulic system main control valve is similar to the 300A control valve arrangement that includes the attachment control valve as standard equipment. The control valve group has two negative flow control valves, a straight travel valve, a parallel tandem logic valve and a selector valve.

Francis June 97

Page:

MAIN CONTROL VALVE FLOW ILLUSTRATION (IN NEUTRAL)

2

14

d

9

8

7

6

13

b

a

5

4

3

2

Stick 2 Control Valve Boom 1 Control Valve Bucket Control Valve Attachment Control Valve Right Travel Control Valve Left travel Control Valve Swing Control Valve Stick 1 Control Valve Boom 2 Control Valve

10. Upper Pump 11. Lower Pump 12. Pilot Pump 13. Straight Travel Valve 14. Main Control Valves a. Center Bypass Passage b. Center Bypass Passage c. NFC Orifice d. NFC Orifice e. Return Passage

12 11

320B330B HYDRAULIC EXCAVATORS

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

c

CHAPTER : Implement & Travel System

10

1

Page:

INDIVIDUAL CONTROL VALVE OPERATION ( Bucket Cylinder Operation As A Typical Example )

3 20

15

Combined Check Valve Main Relief Valve Line Relief Valve (Rod End) Line relief Valve (Head End) Load Check Valve Bucket Cylinder. Parallel Feed Passage Return Line

16

19

3

10

11

18

17

e


15. 16. 17. 18. 19. 20. f. g.

f

14


g

a

Page:

NEGATIVE FLOW CONTROL OPERATION

4

h

b

a

14

c

i

d

11 21. 22. h. i.

NFC NFC NFC NFC

Relief Valve (Lower Pump) Relief Valve (Upper Pump) Passage Passage


10


22

21

Page:

COMBINED FLOW OPERATION CIRCUIT FLOW ILLUSTRATION )

5

l 9

k

24

6

b

13

a

5

3

4

2

d 26

25 24. 25. 26. 27. j. k. l.

Logic Valve. Pressure Control Valve. Check valve. Check Valve Parallel Feed Passage. Combined Flow Passage. Combined Flow Passage.

10 27

f 12 11

1

c


7


8

k

14

j

Page:

1

2

3

4

6

5

18

8

7

9

16

6 28 14

35

34

m

Stick 2 Control Valve Boom 1 Control Valve Bucket Control Valve Attachment Control Valve Right Travel Control Valve Left travel Control Valve Swing Control Valve Stick 1 Control Valve Boom 2 Control Valve Main Control Valve (Left Section) Main Relief Valve Line Relief Valve (Bkt rod end).

33 37

38 29

18. 28. 29. 30. 31. 32. 33. 34. 35. 37. 38. 39.

Line Relief Valve (Bkt head end) Line Relief Valve (stk head end) Line Relief Valve (Stk rod end) Inlet Port (Upper pump) Inlet Port (Lower pump) Boom Drift Reduction Valve Stick Combination Flow Port. PTL Signal Port MCV (Right Section0 Stick Line Relief Valve (Rod End) Stick Drift Reduction Valve Line Relief Valve (Bm head end)

MAIN CONTROL VALVE ( Outside View ) e. Return Port l. Return Port m. Outlet Combination Port


30 39

1. 2. 3. 4. 5. 6. 7. 8. 9. 14. 16. 17.

31

17

32


l

e

Page:

MAIN CONTROL VALVE (CROSS SECTION)

7 36

1

2

j

f

19 3

4

5

13

6

7

8

9

35

1. Stick-2 Spool 14. Left MCV Section 19. Load Check Valve 35. Right MCV Section 36. Logic Circuit a. Center Bypass Passage (Lft Sec) b. Center Bypass Passage (Rgh Sec)

a 30

b 31

d 14


c

l


e

320B330B HYDRAULIC EXCAVATORS CHAPTER : Implement & Travel System

NOMENCLATURE 1. Stick 2 Control Valve 2. Boom 1 Control Valve 3. Bucket Control Valve 4. Attachment Control Valve 5. Right Travel Control Valve 6. Left travel Control Valve 7. Swing Control Valve 8. Stick 1 Control Valve 9. Boom 2 Control Valve 10. Upper Pump 11. Lower Pump 12. Pilot Pump 13. Straight Travel Valve 14. Main Control Valves 15. Combined Check Valve 16. Main Relief Valve 17. Line Relief Valve (Rod End) 18. Line relief Valve (Head End) 19. Load Check Valve 20. Bucket Cylinder. 21. NFC Relief Valve (Lower Pump) 22. NFC Relief Valve (Upper Pump) 23. Selector Valve. 24. Logic Valve. 25. Pressure Control Valve. 26. Check valve. 27. Check Valve. 28. Line Relief Valve (stk head end) 29. Line Relief Valve (Stk rod end) 30. Inlet Port (Upper pump) 31. Inlet Port (Lower pump) 32. Line Relief Valve (Boom rod end) 33. Stick Combination Flow Port. 34. PTL Signal Port 35. MCV (Right Section a. Center Bypass Passage b. Center Bypass Passage c. NFC Orifice d. NFC Orifice. e. Return Port f. Parallel Feed Passage g. Return Line h. NFC Passage i. NFC Passage j. Parallel Feed Passage. k. Combined Flow Passage. l. Combined Flow Passage. m. Outlet Combination Port

Page:

8


NEGATIVE FLOW CONTROL RELIEF VALVE ( Partial Cross Section Of Stick 2 Control Valve )

b

a

c

1 d

a

b

b

c

1

a c

1. 2. a. b. c. d.

Poppet Stem Orifice Passage (From center bypass passage) Return Passage Negative Control Signal Pressure

Page:

9

1

2

d

Page:

BUCKET CONTROL VALVE ( Neutral Position )

10

1. Bucket Control Valve 2. Centering Spring 3. Load Check Valve 4. Line Relief Valve (Head end) 5. Line Relief Valve (Rod end) 6. Stem a. Pilot Port (Bucket close) b. Pilot Port (Bucket open) c. Port (To head end) d. Port (To rod end) e. Center Bypass Passage f. Return Passage g. Parallel feeder passage

d

c

1

f

2

a

b g

4

5

a

b

e

7

6


3


e


BOOM 1 CONTROL VALVE (Boom Raise Position) 1. 2. 3. 4. 5. 6. 7. a. b. c. d.

Boom 1 Control Valve Load Check Valve Bucket Control Valve Regeneration Check Valve Spool Regeneration Valve Boom Anti-dift Valve Parallel Feeder Passage Center Bypass Passage Pilot Passage Vent Hole

c

W

1

2

7

3

W

a b

2

7

d 4

Page:

11

a

b

5

6

c


BOOM REGENERATION CIRCUIT (Hold)

1. 2. 3. 4. 5. 6. 7. 8. a. b. c. d.

Boom 1 Control Valve Load Check Vave Boom Generation Valve Spool Boom Generation Valve Boom Drift Reduction Valve Boom Down Line Relief Valve Top Pump Parallel feeder Path Open Center flow Path Tank Return Orifices Regeneration Orifices

1

b

2

6 2 d 7 c

3

a

12

4 1

b 8

Page:

a

5


BOOM REGENERATION CIRCUIT (Boom Lower)

1. Boom 1 Control Valve 2. Load Check Vave 3. Boom Generation Valve 4. Spool 5. Boom Generation Valve 6. Boom Drift Reduction Valve 7. Boom Down Line Relief Valve 8. Top Pump a. Parallel feeder Path b. Open Center flow Path c. Tank Return Orifices d. Regeneration Orifices e. Regeneration Passage f. Vent Hole

1

b

2

6 2 d 7 a

c

a

f

e 3

Page:

13

4

b 8

5

1


BOOM REGENERATION CIRCUIT (Boom Lower Down Pressure)

1. Boom 1 Control Valve 2. Load Check Vave 3. Boom Generation Valve 4. Spool 5. Boom Generation Valve 6. Boom Drift Reduction Valve 7. Boom Down Line Relief Valve 8. Top Pump a. Parallel feeder Path b. Open Center flow Path c. Tank Return Orifices d. Regeneration Orifices e. Regeneration Passage f. Vent Hole

1

b

2

2

6 d

7 a

c

a

f

e 3

Page:

14

4

b 8

5

1


SWING CIRCUIT SCHEMATIC 1. 2. 3. 4. 5. 6. 7. 9. 10. a. b. c.

Swing Motor Rotary Group. Swing Anti-reaction Valve Spool Line Relief Valve Main Control Valve Slow Return Check Valve Lower Pump Upper Pump Solenoid Valve Swing Brake Port Port Makeup Port

9 10

1

3

c

2

4

a

b

5 7 6

Page:

15


SWING MOTOR (CROSS SECTION FRONT VIEW)

1. 2. 3. 4. 5. a. b. c.

Stem Spring Piston Make-Up Valve Sleeve Inlet Port Return Passage (Make-Up Port) Piston Chamber

3

c 5

2 1 b

a

4

Page:

16


SWING RELIEF VALVE

2

3

1

b

4

a

d

MINIMUM RELIEF PRESSURE

e

5

b 3

1

a

1. 2. 3. 4. 5. a. b. d. e.

d

MAXIMUM RELIEF PRESSURE

Poppet Plug Sleeve Spring Stem Inlet Port (From Hyd. Control Valve) Return Passage (Make-Up Port) Orifice Orifice

Page:

17

e


TRAVEL MOTOR (Cross Section)

10

16

18

3

2

20

4

14

1

15

13

19

6

17 21

5 7 8

1. Drive Shaft 2. Ball Guide 3. Spring 4. Barrel 5. Slipper 6. Retainer 7. Piston 8. Friction Plate 9. Separator Plate 10. Piston Guide 11. Spring

Page:

18

12. 13. 14. 15. 16. 17. 18. 19. 20. 21.

Brake Piston Brake Pilot Valve Check Valve Check Valve Piston Piston Spring Spring Ball Ball

9

12

11


TRAVEL MOTOR Low Speed

1

2

3 3

a

1. 2. 3. 4. a. b. c. d.

Swashplate Servo Piston Speed Change Valve Check Valve Brake Valve From Left Tavel Control Valve From Two Speed Solenoid From Right Travel Control Valve Center Port

Page:

19

d

b

c


TRAVEL MOTOR High Speed

1

2

3 3

a

1. 2. 3. 4. a. b. c. d.

Swashplate Servo Piston Speed Change Valve Check Valve Brake Valve From Left Tavel Control Valve From Two Speed Solenoid From Right Travel Control Valve Center Port

Page:

20

d

b

c


AUTOMATIC CHANGE TRAVEL SPEED VALVE (Schematic)

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. a. b. c.

Upper Pump Lower Pump Pilot Pump Shuttle Valve Two speed solenoid valve (III) Aut. Travel Speed Change Val Sensor Travel Control Valve Swivel Speed Change Valve Brake Pilot Valve Crossover Relief Valve Pilot Line To Speed Change Valves Speed Change Valve Port

10

c 9

11

3 8 4

1 2

6

a

b

5 7

Page:

21


AUTOMATIC SPEED CHANGE VALVE Low Speed - Low System Pressure

5. 6. 7. 9. g.

Two speed solenoid valve AutTravel Speed Change Vale Press Sensor Control Valve. Speed Change Valve To Left Travel Motor

9

g 7

6

5

Page:

22


AUTOMATIC SPEED CHANGE VALVE High Speed - Low System Pressure

5. 6. 7. 9. g.


9

g 7

6

5

Page:

23


AUTOMATIC SPEED CHANGE VALVE High Speed - High System Pressure

5. 6. 7. 9. g.


9

g 7

6

5

Page:

24


PARKING BRAKE 2. 3. 4. 5. 6. 9. 10. 11. a. e. f. h. i.

Spool Piston (Low Speed) Piston (High Speed) Brake Pilot Valve Check Valves Orifice Friction Plates Separator Plates Pilot Port Port (From Travel Motor) Port (To Travel Motor) Passage (To Brake Piston) Port (To Pilot Valve)

6

i

5

i 8 11 10 5

h

12

9 3

4 2

a

i

Page:

25

e

5

6

f


STRAIGHT TRAVEL VALVE & MAIN RELIEF VALVE (Introduction)

Pilot from one or more implements

2

Impl.

R

L

Impl. 10 3

a

4

11

L+R Travel

1. 2. 3. 4.

Right Travel Control Valve Straight Travel Valve Left Travel Control Valve Main Control Valve

Page:

26

b Impl.

10. 11. a. b.

Upper Pump Lower Pump Line (To the left control valve section) Line (To the right control valve section)

1


STRAIGHT TRAVEL CIRCUIT (Travel Position Only)

e

b

d

a

c 10

8

9

6

5

SPB

f

Page:

27

3

7

11

1. Boom 1 2. Bucket 3. Attach 4. Right Travel 5. Travel Press. Sw 6. Imp. Press. Sw 7. Straight Travel 8. Left Travel 9. Swing 10. Stick 1 11. Boom 2

4

1

2

SPB

g

a. To Bucket Cyl b. To right Trv Motor c. To Left Paral Feed. Path d. To Swing Park Brake e. To Left Travel Motor f. From Left Trv Pilot Ctrl g. From Pilot Manifold h. From Top Pump i. From Bottom Pump j. From Right Trv Pilot Ctrl k. From Bucket Pilot Ctrl

h

i

j

k


STRAIGHT TRAVEL CIRCUIT (Travel/Impl Position)

e

b

d

a

c 10

8

9

6

5

11

SPB

f

1. Boom 1 2. Bucket 3. Attach 4. Right Travel 5. Travel Press. Sw 6. Imp. Press. Sw 7. Straight Travel 8. Left Travel 9. Swing 10. Stick 1 11. Boom 2

Page:

28

4

3

7

1

2

SPB

g

a. To Bucket Cyl b. To right Trv Motor c. To Left Paral Feed. Path d. To Swing Park Brake e. To Left Travel Motor f. From Left Trv Pilot Ctrl g. From Pilot Manifold h. From Top Pump i. From Bottom Pump j. From Right Trv Pilot Ctrl k. From Bucket Pilot Ctrl

h

i

j

k

04IMPL

Recommend Documents