8/3/2019 HIDRAULIC 320C

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RENR3819-07August 2005

320C ExcavatorsHydraulic SystemBEA1-UP

FBA1-UP

GAA1-UP

GHA1-UP

GLA1-UP

MAA1-UP

PAA1-UP

ANB1-UP

BCB1-UP

BDB1-UP

MAB1-UP

PAB1-UP

AMC1-UP

BBC1-UP

BDC1-UP

FBC1-UP

GAC1-UP

HBC1-UP

CCD1-UP

BDE1-UP

ALF1-UP

BEF1-UP

DBG1-UP

EAG1-UP

GNG1-UP

JTG1-UP

AKH1-UP

AXK1-UP

BBL1-UP

EGL1-UP

BCN1-UP

SBN1-UP

BER1-UP

BPR1-UP

HKT1-UP

RAW1-UP

BRX1-UP

BMZ1-UP

© 2005 Caterpillar 

All Rights Reserved

Printed in U.S.A.

Pi4

HR

R3

HL

Pi2Pi1

AR5

aR5 aR4 a R3 aR2 aR1 aL1 aL2 a L3 aL4

AR 4 AR 3 A R2 AR1 Pi4 AL1 AL2 AL3 AL4

BR5 BR4 BR3 BR2 BR1 BL1 BL2 BL3 R2 Pi3

bR5 bR4 bR3 bR2 b R1 D ST b L1 b L2 b L3 b L4

P1

P2

PIN

PSA2

PSA1

PAC

T-OUT(2)

DR2

RD3

RD4

Pi2

DR5

T-OUT(1)

DRG

45

46

48

47

23 22 21 20 19 18 16 15 1314

10 MAIN CONTROL VALVE

41 PILOT OIL MANIFOLDf04860

17

30

ONE POSITION T WO POSI T ION T H R EE POSI TI ON

V EN TE D P RE SS UR IZ ED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

L INE S CROS SING L INE S J OINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION

(FIXED)

2-SECTION PUMP

MAIN AUX.

SPRING

(ADJUSTABLE)

VARIABLILTY LINE RESTRICTION

(VARIABLE)

LINE RESTRICTION(VARIABLE and PRESSURE COMPENSATED)

PRESSURE

COMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLES

HYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

U NI DI RE CT IO NA L B ID IR EC TI ON AL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FLUID POWER SYMBOLS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNAL

SUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOID andPILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

B AS IC S YM BO L S PR IN G L OA DE D

CHECK VALVES

TWO

POSITION

INFINITE

POSITIONING

FLOW IN ONE

DIRECTION

FLOW ALLOWED IN

EITHER DIRECTION

THREE

POSITION

CROSS

FLOWPARALLEL

FLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P T

SH I F TED POSI T ION I N F I NI T E POSI T ION

CONTROL VALVES

8/3/2019 HIDRAULIC 320C

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Hydraulic Schematic

PILOT LINE

DRAIN LINE

IN

T

OUT

BDr 

Pi2

(LOCK)

Pi

Dr1

A3 M1

M2

A1

A2

NO3

TOUT1

PIN

PAC

Pi1P2P1 PSA2

DR6DR5

PSA1

DR4DR3DR2DR1

BP1 BT

B A

T

(LOWER)

DR

RR

FR

U

(OUT)

(IN)

T

S1

G

F

S3

Pn1

PsM2

Ps1

PsM1

(RAISE)

(REV)

(FWD)(R) (OPEN)

(CLOSE)

(L)

(FWD)

(REV)

(TRAVEL)

T

P1P2

B2

A 2 B 1

B8B7B6C B5B4B3B2B1

A8A7A6A5A4

Pn2

A3A2A1

E

D

C

B

G3

SDr 

PD6

ST

G4

DB6

Pm

PB2

SP1

A

SP2

P i3 D i3 DST

(IN)

PRPL

(OUT)

AR4

R1BR4

AR3BR3AR2BR2

Dr2

Ps2

SPi

SP3

(RAISE)

AR1BR1

BR5Di4

Pi4

AL1

bL3

AR5

G2

G1

AL4

DB2

BL1

    C    L    O    S    E

AL2

    O    P    E    N

A B

DB1

A1

R3BL2

BPi

AL3

PB1

    D    O    W    N

R2

BP3

    L    R

BP2

bR4

aR5Pi1aR4

bR5

HR

Di1

aR3

bR3

aR2

bR2

aR1

bR1

aL1

bL1HL

aL2

bL2bL4 Pi2

aL4

Di2

    I    N     U    P

Pp3Pp3

    O    U    T

NO1

TOUT2

(SW

PARKING)

BL3

aL3

MU

DR

AB

PG

158-8176

1 2 3

4

5 6 7 8

9

11

1

ItemComponent

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

ComponentNo.ItemNo.

21

22

23

COMPONENTS

Swing Motor 

Left Travel Motor 

Right Travel Motor 

Bucket Cylinder 

Swivel

Stick Drift Reduction Valve

Swing Control Valve

Right Travel Control Valve

Attachment Control Valve

Bucket Control Valve

Line Relief Valve (Stick Cylinder Head End)

Straight Travel Control Valve

24

25

26

27

28

29

30

Stick Unloading Valve

Main Relief Valve

Stick Cylinder 

Boom Cylinder 

Boom II Control Valve

Stick I Control Valve

Left Travel Control Valve

Straight Travel Control Solenoid

Stick Regeneration Valve

Negative Flow Control Relief Valve

Boom I Control Valve

Boom Drift Reduction Valve

Main Control Valve

Stick II Control Valve

Line Relief Valve (Bucket Cylinder Rod End)

Line Relief Valve (Bucket Cylinder Head End)

Boom Regeneration Valve

Pressure Switch

Pressure Switch

Pilot Control Valve (Swing and Stick)

Pilot Control Valve (Boom and Bucket)

Pressure Switch

Accumulator 

Reducing Valve (Boom/Swing Priority Mode)

Pressure Sensor (Left Pump)

Travel Speed Solenoid Valve

34

35

32

33

31

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

37

36

53

54

55

56

57

58

59

Valve

Left Pump

Pilot Pump

Slow Return Check Valve

Bypass Check Valve

Return Filter 

Right Pump

Pilot Relief Valve

Pilot Filter 

Pressure Sensor (Right Pump)60

Oil Cooler 

Pilot Control Valve (Travel)

Negative Flow Control Relief Valve

Travel Brake Valve (Left)

Travel Brake Valve (Right)

Line Relief Valve (Boom Cylinder Rod End)

Swing Parking Brake Solenoid Valve

Solenoid Valve (Hydraulic Activation)

Pilot Oil Manifold

1012

13 14 1516

18 19 20 21 22 23 24

25

17

28 3026

27

29

3 1 3 2 33 34

35

36 37

38

39

4041 42

43

44

45 46 47 48

49

5051

52

53

55

56

57 58 59 60

54

Variable Swing Priority Valve

Hydraulic Tank

Case Drain Filter 

7

4

8

9

55

5610

1535859574950543625

f04859

MAIN CONNECTOR LINE