345BserieIIexcavator Hydraulic System

FLUID POWER SYMBOLS

RENR5349-01 July 2003

BASICCOMPONENT SYMBOLS

MAIN AUX. MAIN  AUX.

PUMP orMOTOR

SPRING

FLUIDCONDITIONE R

SPRING (ADJUSTABLE)

VARIABILITY

CONTROLVALVES

RESTRICTION

PRESSURE COMPENSATION

LINERESTRICTION (VARIABLE)

LINERESTRICTION (FIXED)

PUMP:VARIABLEand 2-SECTIONPUMP PRESSURE COMPENSATED

LINERESTRICTION (VARIABLEandPRESSURECOMPENSATED)

HYDR A U LC I PNEU M A TC I ENERGYTRIANGLES

VALVES VALVE ENVELOPES

T WO P O SI TI ON

ONE POSITION

VALVE PORTS

T HR EE P O SI TI ON

TWO-WAY

CHECKVALVES

 AB

PT NORMALPOSITION

PT S HFI T ED P O STI I ON

I N FI NTI E P O SI TO I N

BASIC SYMBOL

MEASUREMENT

37

36

35

34

33

31

32

30

29

28

26

FOUR-WAY

THREE-WAY

CONTROL VALVES  AB

PRESSURE

SPRING LOADED

ROTATING SHAFTS

FLOW

TEMPERATURE

UNIDIRECTIO NAL

BIDIRECTIONAL

FLUIDSTORAGE RESERVOIRS

25

345B Series II Excavator  Hydraulic System

21

CCC1-UP

44

V ENT ED

RETURNABOVE FLUIDLEVEL

P R E SS URI ZE D

RETURNBELOW FLUIDLEVEL

COMBINATIONCONTROLS

SOLENOID

SOLENOID orMANUAL

SOLENOID andPILOT

FEE1-UP

SOLENOIDand PILOT orMANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

PUSH-PULLLEVER

GENERALMANUAL

PEDAL

PUSHBUTTON

SPRING

PILOT CONTROL SYMBOLS

RELEASEDPRESSURE

B

EXTERNALRETURN

B

REMOTE SUPPLY PRESSURE

INTERNALRETURN

ACCUMULATORS

SIMPLIFIED

CROSSING ANDJOINING LINES

INTERNAL SUPPLY PRESSURE

COMPLETE

HYDRAULICANDPNEUMATIC CYLINDERS

XXXX

R 1772640

SPRING LOADED

GAS CHARGED

HYDRAULICPUMPS FIXED DISPLACEMENT

46

45

Main Control Valve

PG

LINES JOINING

HYDRAULICMOTORS

FIXED DISPLACEMENT

VARIABLEDISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

©2003 Caterpillar   All Rights Reserved

PSA

49 62 P-IN

PAC

PEPU

61

C/V 61 Pi2

T-OUT JPi

60 DR2 DR3

Pi3

DR5

52

Pi5

Pi8

DR6

59

63

LINESCROSSING

SINGLE ACTING

DOUBLEACTING

INTERNALPASSAGEWAYS

INFINITE POSITIONING

FLOW INONE DIRECTION

TWO POSITION

THREE POSITION

PARALLEL FLOW

CROSS FLOW

FLOW ALLOWEDIN EITHERDIRECTION

27

22

Pi1

VARIABLEDISPLACEMENT NON-COMPENSATED

Pilot Oil Manifold DR4

f06197

Printed in U.S.A.

7

Hydraulic Schematic 211-2036 MAINCONNECTORLINE

1

PILOTLINE

2

3

4

5

6

5

6

DRAINLINE

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

1

48

36 37 39 40 41 42 BR

BR

PG2

PG3

T1

T1

T2

T2

L'

PG1

38 6 12

C C

  )     (  

X

X

    (     )

63

L'

55 70

DR1

Dr 

DR2

MU

69

Dr 

5

A

A X

7

53

43 44 45 46 47

X )(

)(

MU

Pi

10

9

8

B' B'

A' A'

B'

12

11

A'

    2    1     d    d     B    BB

Dr2

A

Pi

Dr1

X2 X1

13

OWD

15

14

16

18 17

)( Pi1

Pi3

B

MB

MA

MA

MB

T

Pi2

T

C

II IES SER

A A1 B

P2 A2

A

Pi

P1 B

A Dr  A

B

B

P1

A P2 Dr 

19

3

8

9 65 66 72 73 4 10 11 19

2 20 23

    3     R     A

AL4

25

22

APi

21

ADr       4      R     a

24

    3     R     B

    2     R     B

    3     R     b

    2     R     A

     2      R     a

    1     R     B

    1     R     A

    W     S     P

     1      R     a

    1     L    a

     A      T      P

    1     L     B

    1     L     A

    2     L     b

    2     2     L     L     B     A

    3     L    a

    3     L     B

    3     L     A

    4     L     b

    4     L     B

aL5

R1

26

28

27

R3

33

32

31

34

35

37

36

30 HL

29

R2

AR4

38

HR

TT

TP

DR

39

Y

41

42

43

X

40

TL A2

TLA1

TRA2

 d   R  4 

TRA1

P  S  L 

A P i   2 

 a R  3 

 d   R  5 

P i   L 

 b  R 2 

 d   S  W

 b  R 1 

P L 

 P  R

PP2

44

 b  L  1 

Pp1

PAT

 a L  2 

 b  L   3 

47

46

45

 d  L   5 

 a L  4 

STANDARD COMPONENTS Item No.

48

JLP

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

JLT

50 49 JL3

JL2

JL1

JL4

R2 ST

    5     B     S

    4     B     S

    3     B     S

SB2

SB1

JRP

SP

51

    8     i     P

    5     i     P

    i     P     J

     V       /      C

    3     i     P Pi2

Pi1

X1

JRT

53

    U     E     P

    N     I     P

67

PAC

X

PSA

M3

52 SA5

 S  A 4 

SA3

 S      A      2     

X3

PG JR2

SA1

JR4

JR3

S

57

54

B

A1

65

JR1

M1

66

58

56

DR4

55

A2

D R  6 

D R  3 

 D  R  5 

59

D R 2 

D R 1 

61

T  O  U

M2

T

64

A3

S

60

62

L1

X2

70

69

L

63 74 72

71 S2

R1

68 R1

73

Component

Item No.

Implement/SwingPressureSwitch

38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Left Swing Motor  Right Swing Motor  TravelMotor (Left) TravelMotor (Right) Boom Lowering ControlValve Boom Cylinder  Stick Cylinder  Pilot Brake Valve (Left) CounterbalanceValve (Left) Pilot Brake Valve (Right) CounterbalanceValve (Right) BucketCylinder  Check Valve (Smart Boom) SolenoidValve SolenoidValve Smart BoomManifold Spool Check Valve Swivel Stick Drift Reduction Valve Line Relief Valve (Stick Cylinder Rod End) Main ControlValve

Component Pilot ControlValve (Travel) Negative Flow ControlRelief Valve Valve (Regeneration) Valve (Regeneration and Out) Pressure ControlValve LogicValve Line Relief Valve (Bucket Cylinder Head End) Line Relief Valve (Bucket Cylinder Rod End) Line Relief Valve (BoomCylinder Rod End) Negative Flow ControlRelief Valve Pilot ControlValve (Stick/Swing) Accumulator  Pilot Filter  HydraulicActivationControlValve Solenoid Valve (TravelSpeed) PilotControlValve (Boom/Bucket) Slow Return Check Valve OilCooler  Bypass Check Valve Drain Filter  ReturnFilter  Solenoid Valve (Fine Control) Solenoid Valve (Swing)

TravelPressure Switch

61

ProportionalReducingValve(Powershift)

25

Line Relief Valve (BoomCylinder Head End)

26

Boom IIControlValve

62 63

Pilot OilManifold

27

Line Relief Valve (Stick Cylinder Head End)

28

Stick IControlValve

65

Upper Pump

29 30

Swing ControlValve

LowerPump

31

Straight TravelControlValve

66 67 68

32

Main Relief Valve

69

33

Right TravelControlValve

70

Radiator 

34

AttachmentControlValve

71 72

HydraulicTank

73 74

Cooling Pump

35 36 37

Left TravelControlValve

BucketControlValve Boom IControlValve Stick IIControlValve

64

Pilot Relief Valve

Screen

AutomaticTravelSpeedChangeValve Cooling Pump Relief Valve Fan Motor 

Pilot Pump

Cooling Pump ControlValve

f06187