d8r Hydraulic System

SENR8330 December 1995

FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS

MAIN AUX.

PUMP or MOTOR

SPRING

FLUID CONDITIONER

SPRING (ADJUSTABLE)

VARIABILITY

CONTROL VALVES

PRESSURE COMPENSATION

LINE RESTRICTION (VARIABLE)

LINE RESTRICTION (FIXED)

RESTRICTION

PUMP: VARIABLE and PRESSURE COMPENSATED

2-SECTION PUMP

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

 ATTACHMENT

LINE RESTRICTION VARIABLEandPRESSURE COMPENSATED

VALVES VALVE ENVELOPES

VALVE PORTS

TWOPOSITION T ION

ONEPOSITION

THREE POSITION T ION

TWO-WAY

HYDRAULIC SYSTEM COMPONENTS No.

DESCRIPTION

1

S t ee r n i g M o to r G r ou p

2

S t ee r n i g P u mp G r ou p

3

Steering i ng Pilot ValveGroup

4

Bulldozer Dual Tilt Cylinder Group

5

Bulldozer Lift Cylinder Group

6

Q u ci k -D r op V a vl e

7

Bulldozer Tilt Cylinder Group

8

Steering i ng Charge LoopFilter Group

9

T an k G ro ro up

10

C ove r  

11

Bulldozer Tilt Valve

12

Bulldozer Lift valve

13

R i pp e r V a vl e

14

I n le t M a ni f ol d

15

Ripper Lift / Tilt Valve

16

Pilot Operated ReliefValve

17

Charging Relief Valve

18

Implement Pump Group

19

Bypass / Pressure Control Valve

20

C oo le r  

21

Ripper Tip Cylinder 

22

Ripper Lift Cylinder 

23

Ripper Diverter Valve

24

P i n P u l e r C y il n de r  

FOUR-WAY

THREE-WAY

CONTROL VALVES

CHECK VALVES

 A B

 A B

PT SHIFTED POSITION T ION

PT NORMALPOSITION

INFINITE POSITION T ION

SPRING LOADED

BASIC SYMBOL

MEASUREMENT

PRESSURE

S HU TT LE

P IL OT CONTROLLED

ROTATING SHAFTS

FLOW

TEMPERATURE

UN D I I RE CT O I NA L

BI DI RECT O I N AL

FLUID STORAGE RESERVOIRS

D8R Track-Type Tractor  Hydraulic System 7XM1-UP 9EM1-UP

V EN TE D

RETURNABOVEFLUIDLEVEL

P RE SS UR IZ ED

RETURNBELOWFLUIDLEVEL

COMBINATIONCONTROLS

SOLENOID

SOLENOID or MANUAL

SOLENOIDand PILOT or MANUAL

SOLENOID and PILOT

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

PUSH-PULL LEVER

MANUALSHUTOFF

GENERAL MANUAL

PUSH BUTTON

PEDAL

SPRING

PILOT CONTROL SYMBOLS RELEASED PRESSURE

EXTERNALRETURN

REMOTE SUPPLY PRESSURE

INTERNALRETURN

SIMPLIFIED

CROSSING AND JOINING LINES

ACCUMULATORS

SPRINGLOADED

GAS CHARGED

LINES CROSSING

HYDRAULIC PUMPS FIXED DISPLACEMENT

SINGLEACTING

LINES JOINING

VARIABLEDISPLACEMENT NON-COMPENSATED

FIXED DISPLACEMENT

VARIABLEDISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLEACTING

INTERNAL PASSAGEWAYS

HYDRAULIC MOTORS

UNIDIRECTIONAL

INTERNAL SUPPLYPRESSURE

COMPLETE

HYDRAULIC AND PNEUMATIC CYLINDERS

TWO POSITION

THREE POSITION

INFINITE POSITIONING

PARALLEL FLOW

FLOWINONE DIRECTION

© 1995 Caterpillar   All Rights Reserved

CROSS FLOW

FLOWALLOWEDIN EITHERDIRECTION

Printed in U.S.A.

Electrical Symbols Table Hydraulic Symbols (Electrical)

M

G Transducer  (Fluid)

Transducer  (Gas / Air)

Generator 

Electric Motor 

PRESSURE TAP LOCATIONS L ET TE R

D ES CR IP TI ON

 A

Right Steer Loop (at Motor)

B

R i gh t S t e er L o op ( a t P u m p)

C

L e ft S t ee r A c tu a to r  

D

R i gh t s t ee r A c tu a to r  

E

Pressure Switch (Adjustable)

Pressure Switch

Electrical Wire

Temperature Switch

L e ft S t ee r L o op (a t M o to r )

F

L e ft S t ee r L o op ( a t P u m p)

G

C h ar g e P u m pR e li e f  

H

C on trtr ol ol S u pp ly

J

R ig ht ht S te te e rP i o l t

K

L ef ef t S te te er er P i o l t

L

R ip pe r P il ot ot

M

C as e R et et ur n

N

C h ar g e P u m pD i s ch a rg e

P

C h ar g e P u m pR e li e f  

R

Cool er  

S

Implement Pump Discharge (at Valve)

T

Implement Pump Signal (at Valve)

U

I m pl e me n t P u m p S i g na l

V

Implement Pump Discharge

W

D o wn s tr e am F i l te r  

Electrical Symbols (Electrical)

T

Pressure Symbol

Temperature Symbol

Flow Symbol

Level Symbol

Wire Number Identification Codes Electrical Schematic Example

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

Hydraulic Schematic Example Current Standard

Current Standard Wire

Circuit Number  Identification

Wire Color 

325-AG135 PK-14 325-PK CircuitIdentification Number 

Wire Color 

Wire Gauge

Previous Standard Wire Color 

Wire

325-PK-14 B Circuit Number  Identification

A

Wire Gauge (EXAMPLE VALVE)

    0     0       0    M     3    G     D     3   e ,     8   g    a     P     R     2     1     N     E     S

6

5

4

1

 A

3

B

2

2

1

D

C

F

F 3

24

J E

F

G

K

H

E

E

4

22 20 5

23

21

M

P

N

R 6

19 L

D

D 5 22

4

21 17 16

18

T

U S 15

C

C

V

14

13

    0     M     0   -    G     0    D  ,     3    2    r     3    l   o    o     8    C  ,     R   e    g    a     N     P     2     E     1     S

7 12

B

B

9

LINE PATTERNS

W

Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines

11

Component Group  Attachment  Air Line

8

HYDRAULICCIRCUITCOLOR DESCRIPTIONS

10

 A

CALLOUTS

SteeringPumpOutput. Implement Pump Output. RipperCylinderGroup.

YY

Taps (Pressure, Sampling,Sensor) by letter 

52

Components by number 

Supply Line. Drain / Return Line. Dual Tilt Cylinder Group Lift Cylinder Group TiltCylinderGroup Steering Pilot Valve Group LoadSensing

THIS SCHEMATIC IS FOR THE D8R TRACK-TYPE TRACTOR

PinPullerCylinder 

Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.

6

5

4

3

2

1

 A