Diagrama Hidraulico 345 b

RENR3756-04 September 2011

FLUID POWER SYMBOLS BASICCOMPONENTSYMBOLS M AI N

STANDARDCOMPONENTS Item No.

Item No.

Component

1 2 3

Left Swing Motor 

4 5

TravelMotor(Right)

TravelMotor(Left)

TravelBrakeValve(Left)

12 13 14 15 16 17 18

Stick Drift Reduction Valve

TravelBrakeValve(Right) BucketCylinder  BoomCylinder 

MainControlValve Implement/SwingPressureSwitch TravelPressureSwitch Line Relief Valve (Boom Cylinder Head End)

Line Relief Valve (Stick Cylinder Head End)

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

Valve (Regeneration )

65

Boom Drift Reduction Valve Pilot Control Valve (Trav el)

19 20 21 22 23 24

Boom II Control Valve Stick I Control Valve SwingControlValve LeftTravelControlValve StraightTravelControlValve

25 26 27

Main Relief Valve Right Travel Control Valve  Attachment Control Val ve

28 29

BucketControlValve Boom I Control Valve

30 31 32 33

Stick II Control Valve

SPRING (ADJUSTABLE)

Line Relief Valve (Bucket Cylinder Head End)

CONT R O L V AV L ES

LIN ERES T RI C ITO N (VARIABLE)

PRESSURE COMPENSATION

REST R I C ITO N

LINERE S T RC I TIO N (FIXED)

A U X

PUMP (2-SECTION)

HYDRAULIC PNEUMATIC ENERGYTRIANGLES

PUMP (VARIABLE&PRESSURE COMPENSATED)

LINERESTRICTION  ATTACHME NT NT (VARIABLE&PRESSURE COMPENSATED)

VALVES

VALVE EN VELOPES

VALVE PORTS

Line Relief Valve (Boom Cylinder Rod End) Negative Flow Control Relief Valve PilotControlValve(Stick/Swing)

PG

PSA

ONEPOS ITIO N

T W OP O STI I O N

Pilot Filter 

THRE EPOSIT ION

T W O- W AY

T HR E E -W AY

CONTROLVALVES

HydraulicActivationControlValve

 A B

 A B

PT

PT

FOU R - W AY

CHECKVALVES

 Accumulator  PilotControlValve(Boom/Bucket)

NORMALPOSITION

SHIFTEDPOSITION

BASIC SYMBOL

INFINITEPOSITION

Drain Filter 

45 46 47 48 49

Line Relief Valve (Stick Cyliner Rod End)

VAR IAB I LTI Y

Line Relief Valve (Bucket Cylinder Rod End)

42 43 44

Swivel Boom Raise Pressure Switch

S P RN IG

Component

Logic Valve

36 37 38 39 40 41

StickCylinder 

FLUIDCONDITION ER

PressureControlValve

34 35

Right Swing Motor 

6 7 8 9 10 11

PUMPORMOTOR

SPRING LOADED

SHU T TE L

PIL OT CONTROLLED

FLUIDSTORAGERESERVOIRS

SolenoidValve(FineControl) Solenoid Valve (Travel Speed) SolenoidValve(Swing) 43

ProportionalReducingValve(Powershift)

345B Series II Excavator  Hydraulic System

50

Pilot Relief Valve P-IN

PAC

PilotOilManifold UpperPump Pi1

LowerPump

VEN TED

PRE SSU RE

49

C/V

 Automatic Travel Sp eed Change Valv eed e

345BII: ALB1-UP ALD1-UP AMD1-UP AKJ1-UP AMJ1-UP

DR1 Pi2

CoolingPump

T-OUT JPi

PilotPump

48 DR2

Pi3

Slow Return Check Valve

DR3

DR5

47

Pi5

BypassCheckValve Pi8

Return Filter 

PR E S SU RI Z E D

DR6

Oil Cooler 

46

Radiator 

REU T RN A B O VEFL U I DL E VE L

ROTATING SHAFTS

TEM PER A TU R E

FLO W

SOLENOID

SOLENOID OR MANUAL

SOLENOID &PILOT

B I DR I ECT IONA L

SOLENOID& PILOTORMANUAL

SERVO

THERMAL

DETENT

MANUALCONTROLSYMBOLS

PUSH - PULL LEVER

MANUALSHUTOFF

G EN ER AL M A N UA L

HydraulicTank

P US H BU T ON

PEDAL

PILOTCONTROLSYMBOLS

RELEASEDPRESSURE

CoolingPumpReliefValve 51

UNID IREC TION AL

COMBINATIONCONTROLS

AMN1-UP AYR1-UP AGS1-UP DCW1-UP AKX1-UP

Fan Motor 

Screen

REU T RN B E L OWFL U I DL E VE L

MEASUREMENT

PEPU

S PR N I G

REMOTESUPPLYPRESSURE

Pilot Oil Manifold

Valve(RegenerationandCut) EXTER NALRET URN

INTE RNALR ETUR N

ACCUMULATORS

DR4

SIMPLIFIED

COMPLETE

CROSSING&JOININGLINES

INTERNAL SUPPLYPRESSURE

HYDRAULIC&PNEUMATICCYLINDERS

f03780

S P RN I GL O A D E D

GASCHA RGED

LINE S C R O S SNI G

HYDRAULICPUMPS FIXED DISPLACEMENT

FIXED DISPLACEMENT

UNIDIRECTIONAL

SINGLEACTING

DOUBLEACTING

INTERNALPASSAGEWAYS

VARIABLEDISPLACEMEN T NON-COMPENSATED

INFINITE POSITIONING

3POSITION

2POSITION

FLOWINONE DIRECTION

PARALLEL CROSS FLOW FLOW

FLOW IN EITHER DIRECTION

UNIDIRECTIONAL

BIDIRECTIONAL

© 2011 Caterpillar, AllRights Reserved

LINE S J O I NN IG

HYDRAULICMOTORS

VARIABLEDISPLACEMENT NON-COMPENSATED

BIDIRECTIONAL

Printed in U.S.A.

ELECTRICAL SYMBOLS TABLE 5

29

30

27

28

23

26

21

22

12

HYDRAULICSYMBOLS(ELECTRICAL)

20

25

24 17

G

M

19

13

18

TRANSDUCER (FLUID)

TRANSDUCER (GAS/ AIR)

GENERATOR

ELECTRICMOTOR

PRESSURE SWITCH

PRESSURESWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

2 14

36

1 8

PSW

PTA  AL4

60 61 9 PiH

ELECTRICALSYMBOLS(ELECTRICAL)

 AR3

 AR4

63

BL3

X

BL 2

BL1

BR1

BR2

T

PRESSURE SWITCH

10

TEMPERATURE SWITCH

LEVEL SWITCH

FLOW SWITCH

Y

WIRENUMBERIDENTIFICATIONCODES E LE CT RI CA L SC HE MA TI C EX AM PL E BR3

SER

I ES

BL4

II

AL3

AL1

AL2

CURRENT STANDARD

AR2

 AR1

H YD RA UL C I S CH EM AT C I E XA MP LE CURRENT STANDARD

HARNESSIDENTIFICATIONCODETHIS EXAMPLE INDICATESWIRE135 INHARNESS“AG” WIRE

55

CIRCUITNUMBER IDENTIFICATION

325-AG135 PK-14

WIRECOLOR

54 CIRCUITNUMBER IDENTIFICATION

38

WIRE COLOR

WIREGAUGE

325-PK

PREVIOUSSTANDARD 3

6

37

59

WIRE

31

41

B

325-PK-14

45

56

WIRECOLOR

 A

53

14 32

4

7

Main Control Valve

CIRCUITNUMBER IDENTIFICATION

WIREGAUGE

(EXAMPLEVALVE )

   )   s   e    h   c   n    i    4    2   x   s   e    h   c   n    i    4    3   :   s   n   o    i   s   n   e   m    i    D    (

   4    0      6    5    7    3    R    N    E  e ,    R  g   a

   P    6    1

7

6

5

4

3

2

1

Hydraulic Schematic 165-9624 MAIN CONNNECTOR LINE PILOTLINE DRAIN LINE

E

E

TRACK

2

1

LEFT

RIGHT

4

PG 2

SWING MOTOR

SWING MOTOR

P G3

`

BR

3

BR

T1

T1

T2

T2

L'

PG1 DR1

L'

DR2 X

5

MU

X

MU

7 B' B'

6

 A '  A'

B'

D

B

MB

MA

MB

B

9

8

 A'

D

MA

 A

A  A

B

B

 A

11

10

16

15

12

13

 AR3

BPi

bR3

BR3

aR4 R1 (UP)

 AL4

17

14

 APi  ADr 

(IN)

BR1 BR2  AR2 (R)

(L)

 AR1

aR1

(L)

(F)

(FWD)

(B)

PSW

PTA

aL1 (FWD)

BL1

 AL1

(F)

(B)

C

BL2

 AL2

aL3

BL3

 AL3

(OPEN)

bL4

aL5

BL4 (DOWN)

29

28

27

21

20

18

BDr 

bL2

aR2

C

30

STICK(2)

R3

HL

25

R2

 AR4 HR

19

22

TT

26

23 24

TP

39

39 Y BOOM(2)

32

31

33

STICK(1)

   )   s   e    h   c   n    i    4    2   x   s   e    h   c   n    i    4    3   :   s   n   o    i   s   n   e

   4    0      6    5    7    3    R    N    E  e ,    R  g   a

T L A2

TRAVEL(L)

TLA1

T R A 2

dR4

TRA1

aR3

dR5

 APi2

(OUT)

PiL

dSW

36

35

(R)

SWING

TRAVEL(L)

b R2 b R1

(BACK)

 ATCH

TRAVEL(R) PR P L

PP2

Pp1

bL1

(BACK)

37

X

BUCKET (UP)

(CLOSE)

PAT

aL2

DR

BOOM(1)

bL3

38

(IN,OUT,DOWN)

aL4

dL5

TRAVEL(R)

JLP

40

JLT

B

B 41 STICK JL1

JL3

SWING JL2

JL4

R2

ST

SB5 SB4 SB3 SB2

SB1 SP

Pi8

43

Pi3

JPi

42

Pi5

C/V

PIN

Pi1 Pi2

SA3

SA2

JRP

PSA PG

SA1

JR4

BOOM JR3

B

X3  A1 M1

JR1

X

54

M3 BUCKET JR2

50

49

X1

JRT

44

PAC

PEU

47 SA5 SA4

  m    i    D    (

   P    6    1

PSL

34

52 S

58

57

45 59

DR4 DR6

(SWING)

(SLOW) (TRAVEL)

DR5

DR3

(OIL)

DR2

(PUMP)

DR1

53

(RELIEF)

TOUT

M2  A3

65

60

46

(COOLANT)

55

 A2

51

48

56

 A

S

L1

L

 A

X2

61

62 63

S2

R1

64 R1

THISSCHEMATICISFORTHE345BSERIESII EXCAVATORHYDRAULICSYSTEM MEDIANUMBER: RENR3756-03 SCHEMATICPART NUMBER: 165-9624 Components are shown installed on a fully operable machine with the key and engine off, transmission shifter  in neutraland with parking brake set. Refer to the appropriate Service Manualfor Troubleshooting, Specif ications and Systems Operations.