HIDRAULIC 320C

Pi1

Pi4

RENR3819-07 August 2005

Pi2

FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN AUX.

PUMP or MOTOR

CONTROL VALVES

SPRING

FLUID CONDITIONER

LINE RESTRICTION (FIXED)

RESTRICTION

HR HL R3

PRESSURE COMPENSATION

LINE RESTRICTION (VARIABLE)

SPRING (ADJUSTABLE)

VARIABLILTY

TWO POSITION

ONE POSITION

aR5

aR4

23 AR5

aR3

22 AR4

aR2

21 AR3

aR1

19 18

20

AR1

AR2

Pi4

aL1

30

aL2

16

AL1

aL3

15

14 AL3

AL2

13

bR5

bR4

BR3

bR3

BR2

BR1

bR1

bR2

10 MAIN

DST

bL1

BL2

bL2

BL3

bL3

INFINITE POSITION

SPRING LOADED

BASIC SYMBOL

MEASUREMENT

ROTATING SHAFTS

AL4 PRESSURE

BL1

FOUR-WAY

THREE-WAY

CHECK VALVES

P T SHIFTED POSITION

P T NORMAL POSITION

320C Excavators Hydraulic System

BR4

TWO-WAY

THREE POSITION

AB

AB

17

BR5

VALVE PORTS

CONTROL VALVES

aL4

LINE RESTRICTION (VARIABLE and PRESSURE COMPENSATED)

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

VALVES

VALVE ENVELOPES

PUMP: VARIABLE and PRESSURE COMPENSATED

2-SECTION PUMP

R2

BEA1-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

Pi3

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

UNIDIRECTIONAL

BIDIRECTIONAL

FLUID STORAGE RESERVOIRS

VENTED

RETURN ABOVE FLUID LEVEL

PRESSURIZED

RETURN BELOW FLUID LEVEL

COMBINATION CONTROLS

SOLENOID or MANUAL

SOLENOID

SERVO

SOLENOID and PILOT or MANUAL

SOLENOID and PILOT

DETENT

THERMAL

MANUAL CONTROL SYMBOLS

PUSH-PULL LEVER

PEDAL

PUSH BUTTON

GENERAL MANUAL

SPRING

PILOT CONTROL SYMBOLS RELEASED PRESSURE

EXTERNAL RETURN

ACCUMULATORS

SPRING LOADED

GAS CHARGED

HYDRAULIC PUMPS FIXED DISPLACEMENT

REMOTE SUPPLY PRESSURE

INTERNAL RETURN

VARIABLE DISPLACEMENT NON-COMPENSATED

SIMPLIFIED

CROSSING AND JOINING LINES

LINES CROSSING

LINES JOINING

HYDRAULIC MOTORS FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

© 2005 Caterpillar All Rights Reserved

bL4

FLOW

TEMPERATURE

INTERNAL SUPPLY PRESSURE

COMPLETE

HYDRAULIC AND PNEUMATIC CYLINDERS

SINGLE ACTING

DOUBLE ACTING

INTERNAL PASSAGEWAYS INFINITE POSITIONING

FLOW IN ONE DIRECTION

TWO POSITION

THREE POSITION

PARALLEL FLOW

CROSS FLOW

FLOW ALLOWED IN EITHER DIRECTION

Printed in U.S.A.

CONTROL VALVE

P1

45

RD4 Pi2

46 PSA2

T-OUT(2)

47

PSA1

48

T-OUT(1)

DRG

DR2

PAC

f04860

DR5

41

PILOT OIL MANIFOLD

16 Page, B/W

PIN

RENR3819-07

RD3

P2

4

Hydraulic Schematic 158-8176 MAIN CONNECTOR LINE PILOT LINE DRAIN LINE

1

2

3

10

56

55 8 PG

4

7

DR

9

MU

5

Pp3

6

Pp3

8

T

T

B

7

A

A

B

B

A

9 10

11

12

35

5

3

54

50

49

57

59

58

53

1

SP2

SDr

BDr

BP3

SP3 SP1 T

6

BPi

BP2 SPi

2

AL4 aL4

BL3

ST

R2

BL2

aL3

AL3

aL2

(IN)

(RAISE)

BL1

AL2

13

14

aR1

Pi4

AL1

BR1

AR1

aR2

BR2 AR2

17

16

19

18

aR3

BR3

22

AR5

BT

BP1 BR4

(LOWER)

21

20

AR4

Pi1

aR4

AR3

(CLOSE)

(REV)

(REV)

(L)

15

BR5

Di4

aL1

aR5 R3

R1

24

23 (IN)

36

PB2

DB2 DB1

37

DB6

COMPONENTS

PD6

39

PB1

25

38

26

27

Item No.

28

30

29

B1

A2

B2

B3

A4

B4

A5

C B5

A6

B6

A7

B7

UP

DOWN

OPEN

CLOSE

L

R A3

HL

bL4

Pi2

Di2

(R)

(OUT) bL3

Pi3

Di3

(FWD) bL1

bL2

(FWD) DST

PL

PR

32

bR2

34

33

(OPEN) bR1

(RAISE) bR4

bR3

(OUT) Di1

bR5

HR

A8

A2

A1

B1

41

40

DR

M2

U

42

B2 RR P2

45 P1 P2

51

A

52

46

47

Pi1

Pi2

NO1 (TRAVEL)

(SW PARKING)

44

G2

P1

Pn2

49

A2

Ps2

31

Line Relief Valve (Bucket Cylinder Rod End)

2

Left Travel Motor

32

Line Relief Valve (Bucket Cylinder Head End)

3

Right Travel Motor

33

Boom Regeneration Valve

4

Stick Cylinder

34

Line Relief Valve (Boom Cylinder Rod End)

5

Travel Brake Valve (Left)

35

Pilot Control Valve (Travel)

6

Travel Brake Valve (Right)

36

Pressure Switch

7

Bucket Cylinder

37

Pressure Switch

8

Boom Cylinder

38

Pilot Control Valve (Swing and Stick)

39

Pilot Control Valve (Boom and Bucket)

S3

PSA1 PSA2 NO3 (LOCK)

PAC

40

Pressure Switch

Stick Drift Reduction Valve

41

Pilot Oil Manifold

12

Boom Drift Reduction Valve

42

Accumulator

13

Boom II Control Valve

43

Reducing Valve (Boom/Swing Priority Mode)

14

Stick I Control Valve

44

Pressure Sensor (Left Pump)

15

Swing Control Valve

45

Travel Speed Solenoid Valve

16

Left Travel Control Valve

46

Swing Parking Brake Solenoid Valve

17

Straight Travel Control Solenoid

47

Valve

18

Main Relief Valve

48

Solenoid Valve (Hydraulic Activation)

19

Right Travel Control Valve

49

Left Pump

Attachment Control Valve

50

Pilot Pump

51

Slow Return Check Valve

22

Boom I Control Valve

52

Bypass Check Valve

23

Stick II Control Valve

53

Return Filter

Dr2

24

Negative Flow Control Relief Valve

54

Right Pump

Dr1

25

Negative Flow Control Relief Valve

55

Oil Cooler

G3

26

Stick Regeneration Valve

56

Hydraulic Tank

50

B

S1

C

PsM1

D

G F

E

Ps1

53 DR1 DR2 DR3 DR4 DR5 DR6

A1 TOUT1

TOUT2

PIN

54

55

Pn1

IN

OUT

20

27

Stick Unloading Valve

57

Case Drain Filter

58

Pilot Relief Valve

28

Line Relief Valve (Stick Cylinder Head End)

29

Variable Swing Priority Valve

59

Pilot Filter

30

Straight Travel Control Valve

60

Pressure Sensor (Right Pump)

Pi A3

T

Main Control Valve

11

Bucket Control Valve

G4

43

Swivel

21

PsM2

48

Component

Swing Motor

10

B8

Item No.

1

9

FR

16 Page, B/W

RENR3819-07

A1

IN

OUT

31

Component

M1 G1

Pm

56 f04859

57

58

59

60