320 B Hydraulic

SENR9249-04 July 2002

19

A

   R

   R    A   0    0    L   E    L   H    I    P   9    2    R   5    E   0      T   4    5    A   1    C   N    /    P

   N    /    S

B A

18

B

320B Excavators Hydraulic System 52

53

54

55

12

44

46

47

48 16

17

18

320B:

320B N:

320B L:

3MR1-UP

4NR1-UP

4MR1-UP

5BR1-UP

6CR1-UP

9KR1-UP

5CS1-UP

1CS1-UP

5GW1-UP

4XW1-UP

2WZ1-UP

50 49

38 39

© 2002Caterpillar   All Rights Reserved 14

Main Control Valve

15

: 320B

Note: 27

31

320B L:

26

3MR1-UP

4MR1-UP 2WZ1-UP

34

P

25

T-OUT

M1

P1

J

P2

M2 Psg

24

DR5

Ps Pn1

23

Pn2

DR6

35

Pm

22 G2

D2

S1

G1

33 DR4

ATTACHMENTCOMPONENTS

32

Pilot Manifold

Item No.

32

30

Description FrontPump

33

RearPump

34

PressureSwitch

35

PilotPump

f05847

Printed in U.S.A.

Hydraulic Schematic 115-9033 115-9034

1

2

3

TRAVEL MOTOR (LEFT)

4

TRAVEL MOTOR (RIGHT)

MAINCONNECTORLINE PILOTLINE

MOTOR

DRAINLINE

37

35

28

15

34 36 41

PG DR Pp3 Pp3

MU

7

T

5

T 6

4

7

8

8

A

9 B

B

B

1 9

A

11

A 11

13

14

16

15

17

AP2

50 BPi

ADr  APi

BL4

BR3

AT

aR3 dR4

PSL AR3

R1

R3

BR2

BR1 aR2

AR2

(L)

(R)

(B)

aL2 46

AR1 aR1

PSW

PTA

aL1

(F)

BL1

AL1

(B)

(F)

BL2 AL2

aL3 BL3

BP2

2 5

33

32

30

3 6

BDr 

aL4 AL3

BP3

BP 1

B T

aL5

AL4 R2

53

AP1

49

R4

55

44

54

52

STICK(2)

18

HL 48

R3

AR4 51

HR

47 BOOM(2) Y

aR4

bR3

TRAVEL(R)

TRAVEL(L) PiL

bR2 bR1

dSW

DR

BOOM(1)

SWING STICK (1) 19

dST1

PR

PL

PP

bL1

ATCH

BUCKET

b L2

bL3

STANDARDCOMPON ENTS Item No.

X

1

PAT

PiB

bL4

dL5

FlowControlValve

29

HydraulicActivation ControlValve

3

TravelMotor(Right)

30

PilotOil Manifold

Stick Cylinder 

31 32

Travel Brake Valve (Right)

33

LowerPump

7

BucketCylinder 

34

Pressure Switch

Boom Cylinder 

35

PilotPump

Solenoid Valve (Swing Parking Brake)

36

Case Drian Filter 

9 JLP

JLT

10 11

STICK JL3 JL1 TLA2 TLA1

23

SWING JL4

JL2

TRA2

22

     i      P      J

     5      i      P

     8      i      P

TRA1

25

24

26

27

JRP

JRT

R2

(PUMP) TRAVEL(L)

X1 BUCKET

TRAVEL(R)

JR4 (LEVELING)

JR2

BOOM JR3

JR1

M3

(TRAVEL)

X3 A1

(RELIEF) PAC

32 SP

SB5SB4 SB3 SB2 ST SB1

29

J

M1

34

S

28 30

SA5 SA4

SA3

SA2

     1      2      3      4      5      6      R      R      R      R      R      R      D      D      D      D      D      D

     3      2      i      i      P      P

     1      i      P

     T      U      N      I      O      T      P

     G      P

A2

OilCooler 

38

Check Valve

TravelControlValve(Right)

39

BypassCheckValve

BoomDriftReductionValve

40

Return Filter 

Stick DriftReduction Valve

41

HydraulicTank

MainControlValve

42

PilotFilter 

16

Implement/Swing Pressure Switch

44

17

TravelPressureSwitch

46

18

Main Relief Valve

47

Boom IIControlValve

19

Boom Raise Pressure Switch

48

Line Relief Valve (BucketCylinderHeadEnd)

20

PilotControlValve(Travel)

49

Line Relief Valve (Stick CylinderHeadEnd)

21

PilotControlValve (Swing/Stick) ck)

50

Line Relief Valve (Boom CylinderHeadEnd)

22

SolenoidValve(FineControl)

51

23

SolenoidValve(TravelSpeed)

52

24

SolenoidValve(Swing Priority)

53

Boom IControlValve

25

ProportionalReducing Valve(PowerShift)

54

BucketControlValve

55

AttachmentControlValve

26

33

31

37

13

15

(SWING)

TravelControlValve(Left) Swivel

12

14

     A      S      P

     U      E      P

     V      /      C

PilotReliefValve UpperPump

Travel Brake Valve (Left)

6

8

21

TP

Component

28

TravelMotor(Left)

4

TT

Item No.

2

5

20

Component Swing Motor 

27

Accumulator 

StraightTravelControlValve LeftTravelControlValve

Line Relief Valve (BucketCylinderRodEnd) Stick IIControlValve

PilotControlValve (Bucket/Boom) /Boom)

M2 A3

SA1

35 37 X2

R1

36 41

38 39

f05857

40

R1

42