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FLUID POWER SYMBOLS

RENR1185-03 May 2003

BASIC COMPONENT SYMBOLS MAIN AUX.

PUMP or MOTOR

LINE RESTRICTION (FIXED)

RESTRICTION

PRESSURE COMPENSATION

LINE RESTRICTION (VARIABLE)

SPRING (ADJUSTABLE)

VARIABILITY

22

CONTROL VALVES

SPRING

FLUID CONDITIONER

PUMP: VARIABLE and PRESSURE COMPENSATED

2-SECTION PUMP

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

ATTACHMENT

LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED

VALVES VALVE ENVELOPES

VALVE PORTS

TWO POSITION

ONE POSITION

TWO-WAY

THREE POSITION

CONTROL VALVES

19

29

23

24

25

26

CHECK VALVES

AB

AB

P T SHIFTED POSITION

P T NORMAL POSITION

INFINITE POSITION

a4

a3

a2

ROTATING SHAFTS

a1 PRESSURE

FLOW

TEMPERATURE

A2

A3

A4

A5

M312, M315 and M318 Wheeled Excavators Hydraulic System

P2 LS

B1

B2

B3

B4

VENTED

T1

b5

b4

b3

b2

8AL1020-UP 6TL410-634 7ML860-1214 6ES229-UP 8SS1-UP

b1

RETURN BELOW FLUID LEVEL

COMBINATION CONTROLS

SOLENOID or MANUAL

SERVO

SOLENOID and PILOT or MANUAL

SOLENOID and PILOT

DETENT

THERMAL

MANUAL CONTROL SYMBOLS

MANUAL SHUTOFF

PUSH-PULL LEVER

GENERAL MANUAL

PUSH BUTTON

PEDAL

SPRING

PILOT CONTROL SYMBOLS RELEASED PRESSURE

EXTERNAL RETURN

REMOTE SUPPLY PRESSURE

INTERNAL RETURN

SIMPLIFIED

CROSSING AND JOINING LINES

ACCUMULATORS

SPRING LOADED

GAS CHARGED

LINES CROSSING

HYDRAULIC PUMPS FIXED DISPLACEMENT

MAIN CONTROL VALVE

BIDIRECTIONAL

RETURN ABOVE FLUID LEVEL

PRESSURIZED

SOLENOID

B5

UNIDIRECTIONAL

FLUID STORAGE RESERVOIRS

15 A1

SPRING LOADED

BASIC SYMBOL

MEASUREMENT a5

FOUR-WAY

THREE-WAY

HYDRAULIC AND PNEUMATIC CYLINDERS

SINGLE ACTING

LINES JOINING

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLE ACTING

INTERNAL PASSAGEWAYS

HYDRAULIC MOTORS

VARIABLE DISPLACEMENT NON-COMPENSATED

INTERNAL SUPPLY PRESSURE

COMPLETE

FLOW IN ONE DIRECTION

TWO POSITION

THREE POSITION

INFINITE POSITIONING

PARALLEL FLOW

CROSS FLOW

FLOW ALLOWED IN EITHER DIRECTION

16

Printed in U.S.A.

© 2003 Caterpillar All Rights Reserved

Electrical Symbols Table 6

Hydraulic Symbols (Electrical)

36 4 34 14 20 21

30

G

35

STANDARD COMPONENTS

49

48

66

4A

3A

M

1A

2A

T1/2

H 5A

6A

T4 PST

3T

62

64

P

Component

Stabilizer Solenoid Valve Steering Valve Swing Motor Stick Cylinder Bucket Cylinder Boom Cylinder Stabilizer Cylinder Wheel Brake Oscillating Axle Accumulator Oscillating Axle Cylinder Steering Cylinder Travel Brake Valve Bottom Swivel Brake Light Pressure Switch Attachment Control Valve Main Control Valve Travel Motor Wheel Brakes Accumulator Main Relief Valve Low Brake Pressure Switch Wheel Brake Valve Implement/Travel Signal Limiter Valve Stick Control Valve Travel Control Valve Bucket Control Valve Boom Control Valve Transmission Top Swivel Dozer/Stabilizer Control Valve Implement/Travel AEC Pressure Switch Downshift Inhibitor Dozer/Stabilizer Pilot Control Valve Oscillating Axle/Operating Brake Valve

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

Component

Transducer (Fluid)

2

Travel Pilot Control Valve

62

Boom/Bucket Pilot Control Valve

Transducer (Gas / Air)

Generator

Electric Motor

8

Low Transmission Clutch Pressure Switch Trnsm Shift/Parking Brake Control Valve

5

45

Transmission Clutch Accumulator Blade Cylinder

46

Blade Solenoid Valve Governor Actuator

Pressure Switch (Adjustable)

Pressure Switch

44

Main Pump

Electrical Wire

Temperature Switch

43

Swing Pump Swing Charge Filter

60

Oil Cooler

Electrical Symbols (Electrical)

Swing Brake Solenoid Valve Travel Activation Solenoid Valve Implement Activation Solenoid Valve 40

Pilot Manifold

3

T

Pilot Oil Filter 46

Steering Flow Control Valve 59

Return Oil Manifold

18

Pressure Symbol

10

66

Brake/Pilot Pump

12

Steering/Cooling Pump

Temperature Symbol

Flow Symbol

Level Symbol

7

13

Wire Number Identification Codes

Engine Swing Charge Pump

Electrical Schematic Example

Pilot/Transmission Drain Oil Screen

Hydraulic Schematic Example

Main/Swing Pump Drain Oil Screen

Current Standard

Current Standard

Return Oil Filter Creeper Speed Solenoid Valve

Harness identification code This example indicates wire 135 in harness "AG".

Swing Pump Pressure Reducing Valve

Wire Circuit Number Identification

Swing AEC Pressure Switch Main Pump Pressure Reducing Valve

Wire Color

325-AG135 PK-14

Pilot Accumulator

325-PK

Pilot Pressure Relief Valve

Circuit Identification Number

Pressure Tap Block

Wire Color

Wire Gauge

Stick/Swing Pilot Control Valve

Previous Standard g01004706

17

Wire Color

Wire 31

65

11

325-PK-14 B

Pilot Manifold

50

Circuit Number Identification

A

Wire Gauge (EXAMPLE VALVE)

16 Page, DGM

47

61

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

M

37

Item No.

RENR1185-03

Item No.

3

LINE PATTERNS 1

L

2

R

Main Connector Line Pilot / Load Sensing Pressure

9

7

6

5

4

Drain / Return Lines

36 4 34 14 20 21

Component Group

6

L

30

Attachment

7

35

Z

37

Air Line

8 8

10

10

AB

U

T

6

CALLOUTS YY

Taps (Pressure, Sampling,Sensor) by letter

52

Components by number

2 62 8

5

45 44 46

P

T

MC 43 6 5 1 3 2 4 0

11 A

B

60

40

16

15

12

3 46

13 B1 A'

L

B'

G

B2

Br

b5

A5

b4

B4

A4

b3

B3

A3

b2

B2

A2

B1

b1

A1

18

10

66 12

18

7

13

19

14 17

B5

59

19

x

x

U

18 20 d

A'

T

D

B'

22

N

21

Br

26 P

T

X X1

E K

27 17 B

28

J

P

LS

a5

MT

P2 P1

25

24

23

2 5 1 4 6 3

11

T

30 33

32 B K

36 37

1

2

1

2

3

B

B

2

35

4

38 A

31

a1

a2

29

M

31

a3

a4

A

1

1

2

3

4

34 STANDARD COMPONENTS Item No.

8

P

A

39

8

B

MC

40 T

41

16 Page, B/W, DGM

RENR1185-03

T

P

T

P

T

42 L

47 A4

44

P M

B

R T1

T2

X

Z

48

49 A1

A2

H

M

51 Fe

Fa

43

52

T

Y1

Y3

Y2

A3

P

P

46

45

50

A

T1 PS R

C

E

A

D

T1/2

T2 A6

B

M6

T3

A5

M5

T4

SP

PST

F

MB

61

53 Qmax

Qmin

58 A

54

55

56

62

X1

S

M1

X2

G

S

59

B

63

G

64 66 65

57

MA

P

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

Component

Stabilizer Solenoid Valve Steering Valve Swing Motor Stick Cylinder Bucket Cylinder Boom Cylinder Stabilizer Cylinder Wheel Brake Oscillating Axle Accumulator Oscillating Axle Cylinder Steering Cylinder Travel Brake Valve Bottom Swivel Brake Light Pressure Switch Attachment Control Valve Main Control Valve Travel Motor Wheel Brakes Accumulator Main Relief Valve Low Brake Pressure Switch Wheel Brake Valve Implement/Travel Signal Limiter Valve Stick Control Valve Travel Control Valve Bucket Control Valve Boom Control Valve Transmission Top Swivel Dozer/Stabilizer Control Valve Implement/Travel AEC Pressure Switch Downshift Inhibitor Dozer/Stabilizer Pilot Control Valve Oscillating Axle/Operating Brake Valve

Item No.

Component

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

Travel Pilot Control Valve

60 61 62 63 64 65

Return Oil Filter

66 67

Pilot Pressure Relief Valve

Boom/Bucket Pilot Control Valve Low Transmission Clutch Pressure Switch Trnsm Shift/Parking Brake Control Valve Transmission Clutch Accumulator Blade Cylinder Blade Solenoid Valve Governor Actuator Main Pump Swing Pump Swing Charge Filter Oil Cooler Swing Brake Solenoid Valve Travel Activation Solenoid Valve Implement Activation Solenoid Valve Pilot Manifold Pilot Oil Filter Steering Flow Control Valve Return Oil Manifold Brake/Pilot Pump Steering/Cooling Pump Engine Swing Charge Pump Pilot/Transmission Drain Oil Screen Main/Swing Pump Drain Oil Screen

Creeper Speed Solenoid Valve Swing Pump Pressure Reducing Valve Swing AEC Pressure Switch Main Pump Pressure Reducing Valve Pilot Accumulator

Pressure Tap Block

Stick/Swing Pilot Control Valve

67

MA

g01004706

60 PUMP

Ls

PILOT

PROP P

PROP SW

STEERING

WHEEL BRAKE

BRAKE SW

AUX

THIS SCHEMATIC IS FOR THE M312, M315 and M318 WHEELED EXCAVATORS Part #: 129-0083 Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.