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2002 Caterpillar

All Rights Reserved

Printed in U.S.A.

SENR9249-04July 2002

320B ExcavatorsHydraulic System

320B:

3MR1-UP

5BR1-UP

9KR1-UP

1CS1-UP

4XW1-UP

320B N:

4NR1-UP

320B L:

4MR1-UP

6CR1-UP

5CS1-UP

5GW1-UP

2WZ1-UP

T-OUT

DR6

DR5

DR4

B

B

A

A

S/N

CATERPILLAR

P/N1

54-0529HE00

R

Pm

S1D2 G1

G2

Pn2

Ps

Psg

M2P2JP1M1

Pn1

P

ItemNo. Description

ATTACHMENTCOMPONENTS

32

33

34

35

FrontPump

RearPump

PressureSwitch

PilotPump

19

18

52 53 54 12 44 46 4755

16 17 18

49

38

14

50

48

39

27 31 26

25

24

23

22

34

35

33

32

Main Control Valve

30Pilot Manifold

15

Note: 320B 320B L:

3MR1-UP 4MR1-UP

2WZ1-UP

:

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STICK SWING

BOOMBUCKET

JR1JR3

JR2JR4

JRTJRP

JL4 JL2JL1JL3

JLTJLP

Pp3

Pp3

T T

ABBA

TRAVEL MOTOR (RIGHT)TRAVEL MOTOR (LEFT)

AR1

BR1

ST

AL2BL2

X

DR

R2

HL

dL5

aL5

aL4

AL3BL3aL3

aL2

AL1BL1aL1PSWaR1aR2AR2BR2aR3

dR4

Y

HR

AR4

R1

dSW bR2 bR1 dST1 PLPR PP bL1 PAT bL2 bL3 PiB bL4

BOOM(1)

BUCKETATCHTRAVEL(R)

PiLbR3aR4

SA5 SA4 SA3SA2

SA1

SB5SB4SB3SB2 SB1SP

(F)

BP 1 B T

BPi

BP3

(F)(B)(R)(L)

SWING

(B) AL4

J

R1

S

R2

X1

X2

M3

X3

A1

M1

A2

M2

R1

A3

AP2

DR2

PAC

PSA

DR3

Pi3

DR1

TOUT

PG

PG

PIN

JPi

Pi5

Pi8

C/V

PEU

DR4

DR5

Pi2

(LEVELING)

Pi1

DR6

(TRAVEL)

(SWING)

(PUMP)

(RELIEF)

R3

R4

R3AR3

STICK (1)

STICK(2)

BOOM(2)

TRAVEL(L)

AP1

PTA

AT

MOTOR

MU

DR

TT

AB

TP

TRAVEL(R)TRAVEL(L)

TLA2

BDr

TLA1 TRA1

TRA2

PSL

APiBL4

BR3

ADr BP2

4

1 2 3

6 78

5

11 13

15 16 1714

18

19

20

21

22

23 24 25 26 27

2829

30 31

36

37

39 40

4138

42

32

33

34

35

1

ItemComponent

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1718

19

20

STANDARDCOMPON ENTS

ComponentNo.ItemNo.

28

29

30

31

32

33

34

35

36

37

38

39

21

22

25

26

23

24

40

41

42

Swing Motor

TravelMotor(Left)

TravelMotor(Right)

Stick Cylinder

Travel Brake Valve (Left)

Travel Brake Valve (Right)

BucketCylinder

Boom Cylinder

TravelControlValve (Left)

TravelControlValve (Right)

BoomDriftReduction Valve

Stick DriftReduction Valve

Main ControlValve

Implement/Swing Pressure Switch

TravelPressure SwitchMain Relief Valve

Boom Raise Pressure Switch

PilotControlValve (Travel)

PilotControlValve (Swing/Stick)

Swivel

SolenoidValve (Fine Control)

SolenoidValve (TravelSpeed)

SolenoidValve (Swing Priority)

Accumulator

PilotOil Manifold

PilotRelief Valve

UpperPump

LowerPump

PilotPump

OilCooler

Check Valve

HydraulicTank

PilotFilter

FlowControlValve

HydraulicActivation ControlValve

BypassCheck Valve

Return Filter

27 PilotControlValve (Bucket/Boom)

Pressure Switch

44

4647

48

49

50

51

52

53

54

55

StraightTravelControlValve

LeftTravelControlValveBoom IIControlValve

Line Relief Valve (BucketCylinderHeadEnd)

Line Relief Valve (Stick CylinderHeadEnd)

Line Relief Valve (Boom CylinderHeadEnd)

Line Relief Valve (BucketCylinderRodEnd)

Stick IIControlValve

Boom IControlValve

BucketControlValve

AttachmentControlValve

1

2 5 3

4

7

8

6

9

1537

32 33

35 41

11

34

30

3628

PILOTLINE

DRAINLINE

Hydraulic Schematic

MAINCONNECTORLINE

115-9033

115-9034

Case Drian Filter

9

47

4944

46

55 54

48

51

53

50

52

Solenoid Valve (Swing Parking Brake)

ProportionalReducing Valve (PowerShift)

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