©2003 CaterpillarAll Rights Reserved

Printed in U.S.A.

RENR7137January 2003

322C ExcavatorsHydraulic System DAA1-UPFED1-UPBTE1-UPKCF1-UPHBG1-UPADX1-UP

DR2

T-OUT(2)

PSA1

DR1PSA2

P-IN

Pi1

P2

PAC

P1

DR6

T-OUT(1)

DR5

Pi2

DR4

X

TANK3

AL4 AL3AL2

AL1

BL4 BL3 BL2BL1

18

Main Conrol Valve

Pilot Oil Manifold

14

38

23

24

49

47

46

45

50

30 28 27 26 25 22 21 20

T

BDr

Pi2NO3

TOUTPIN

PACPi1P2P1 PSA2

DR6DR5

PSA1

DR4DR3DR2DR1

G

P T G

E FD

C

BA

A B

L

BP1 BT

B A

T

Pi

Dr1

A3 M1

M2

A1

A2

A4

S1

S3

Pn1

PsM2

Ps1

PsM1

Pn2

DrM

M3

M4

Pm

Dr2

Ps2

S4

T

T

P1P2

B2

A2 B1

P4

SDr

STSP1

SP2

Pi3 Di3 DST PRPL

AR4R1BR4

AR3BR3AR2BR2

SPi

SP3

AR1BR1

BR5

RR

R3

G2

Di4Pi4

AL1

bL3

AR5

FR

U

AL4

G1

BL1AL2

A B

A1

BL2

BPi

AL3

B8B7B6

R2

C

BP3

B5B4B3B2B1

BP2

bR4

aR5Pi1aR4

bR5HR

Di1

aR3

bR3

aR2

bR2

aR1

A8

bR1

A7

aL1

bL1

A6

HL

A5

aL2

bL2bL4 Pi2

aL4

Di2

A4A3A2A1

Pp3Pp3

P3

NO1 (SW

BL3aL3

MU

DR

AB

PG

PILOT LINE

DRAIN LINE

Hydraulic Schematic

MAIN CONNECTOR LINE

ItemComponent

STANDARD COMPONENTS

No.

12345

ItemComponentNo.

Stick Cylinder

Swing Motor

Left Travel Motor Right Travel Motor

Travel Brake Valve (Left)

Travel Brake Valve (Right)

Bucket Cylinder

Boom Cylinder

Swivel Pilot Control Valve (Travel)

Stick Drift Reduction Valve Main Control Valve

Boom Drift Reduction Valve

Pressure Switch

Line Relief Valve (Boom Cylinder Head End)

Boom II Control Valve

Stick Regeneration Valve

Stick I Control Valve

Swing Control Valve

Left Travel Control Valve

Straight Travel Solenoid Valve

Straight Travel Control Valve

Right Travel Control Valve

Attachment Control Valve

Bucket Control Valve

Boom I Control Valve

Line Relief Valve (Boom Cylinder Rod End)

Stick II Control Valve

Relief Valve (Negative Flow)

Pilot Control Valve (Swing and Stick)

Pilot Control Valve (Boom and Bucket)

Relief Valve (Negative Flow)

Stick Unloading Valve

Line Relief Valve (Stick Cylinder Head End)

Variable Swing Priority Valve

Main Relief Valve Line Relief Valve (Bucket Cylinder Rod End)

Line Relief Valve (Bucket Cylinder Head End)

Boom Regeneration Valve

Logic Valve

Relief Valve (Fan Pump)

Bypass Check Valve Travel Speed Solenoid Valve

Swing Parking Brake Solenoid Valve

Accumulator

Solenoid Valve (Hydraulic Activiation)

Pilot Oil Manifold

Pressure Reducing Valve for Swing Priority

Pressure Reducing Valve for Boom Priority

Pressure Sensor (Left Pump)

Left Pump

Oil Cooler

Gear Pump (Fan Motor)

Return Filter

Hydraulic Tank

Drain Filter

Pressure Sensor (Right Pump)

Pilot Pump

Proportional Reducing Valve (Power Shift)

Cooling Pump

Right Pump

Hydraulic Activated Valve

Anti-Reaction Valve

206-3169

1

2

3 4

5 6 78

9 9

10

11

12

1314

1516

1717

18 1920

6789

101112131415161718192021222324252627282930313233

343536373839404142434445464748495051525354555657585960616263646566

2

66 56 55

63

62

10

9

113433

6059

61

51

58

57

67

64

2122

23

2425

262827

29

30

31

32 33

34

35 36 37 3839 40 41

42

43

44

45 46

47

48

49

50

51 52

53

54

55

5657

58 59

60 6162 63

64

65

66

Line Relief Valve (Stick Cylinder Rod End)

Pilot Oil Relief Valve Pilot Oil Filter

63

74

1

8

161413

g00949684