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Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit Number Identification

Wire Number Identification Codes

Current Standard

Previous Standard

Electrical Schematic Example Hydraulic Schematic Example

325-PK

Wire ColorCircuit Number Identification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer(Fluid)

Transducer(Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch (Adjustable)

Temperature Switch

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)

2-SECTION PUMP

MAIN AUX.

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

LINE RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-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

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID or MANUAL

SOLENOID and PILOT

SOLENOID and PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

T

©2007 CaterpillarAll Rights Reserved

Printed in U.S.A.

RENR9033-01March 2007

16M Motor GraderHydraulic SystemB9H1-UP

Description PartNumber

SchematicLocation

MachineLocation

Accumulator Gp - Blade Cushion 219-8035 D-5,D-7,D-8 1Accumulator Gp - Brake 260-9428 A-2 , B-2 2Breather Assembly 9R-9925 B-8 3Control Gp - Brake Pedal 301-4129 E-1 4Cylinder Gp - Articulation 290-8074 D-6 5Cylinder Gp - Blade Lift (LH) 270-7538 D-4 , E-7 6Cylinder Gp - Blade Lift (RH) 270-7538 D-5 , E-8 7Cylinder Gp - Blade Tip 9T-8944 F-3 8Cylinder Gp - Center Shift 262-1905 F-4 9Cylinder Gp - LH Steering 267-3863 E-3 10Cylinder Gp - Ripper Lift 113-5264 D-7 11Cylinder Gp - RH Steering 267-3863 E-2 12Cylinder Gp - Side Shift 257-5083 F-4 13Cylinder Gp - Wheel Lean 289-3054 F-6 14Filter Gp - Pilot 191-9784 B-4 15Filter Gp - Return 249-2307 A-8 16Lock Gp - Center Shift 246-4477 D-4 17Manifold Gp - Control Blade Cushion 253-1320 D-4 , D-5 18Manifold Gp - Pilot Shutoff Solenoid 263-1790 B-5 19Motor Gp - Circle Drive 9T-5977 F-6 20Motor Gp - Fan 304-1005 A-3 21Pump Gp - Fan / Brake 257-6832 B-7 22Pump Gp - Implement / Steering 246-4486 B-6 23Pump Gp - Secondary Steer 273-8714 A-5 24Screen - Implement Control Valve (Front) 250-1420 E-3 25Screen - Implement Control Valve (Rear) 250-1420 C-4 26Screen - Steer Pilot Manifold Valve 6E-5066 C-2 27Swivel - Blade 260-6502 F-4 28Tank Gp - Hydrualic Oil 275-6574 B-8 29Valve - Shuttle (Load Signal Resolver) 6R-7605 B-3 30Valve Gp - Check (E) 231-7701 B-5 31Valve Gp - Check (Implement / Steer) 255-3631 B-6 32Valve Gp - Check (Secondary Steer) 9T-1013 A-5 33Valve Gp - Constant Downforce 279-6521 D-7 ,D-8 34Valve Gp - Cooler Bypass 266-1595 A-4 35Valve Gp - Fan / Brake Control 251-8256 B-3 36Valve Gp - Implement Control (Front) (5-Bank) 261-3272

(6-Bank) 261-3273(7-Bank) 261-3274

Valve Gp - Implement Control (Rear) (3-Bank) 261-3278(4-Bank) 261-3281(6-Bank) 261-3283

Valve Gp - Relief (Secondary Steer) 9T-8071 A-5 39Valve Gp - Steering Control 301-5359 D-2 thru D-3 40Valve Gp - Steering Pilot Manifold 254-3415 C-1 41

C-4 thru C-8

37

38

Component Locations

F-2 thru F-8

Tap LocationsPressure, Sampling, and Sensor

TapNumber Description Schematic

LocationAA Implement / Steering Pump Load Sense B-6BB Implement / Steering Pump Pressure B-5CC Pilot Supply Pressure B-5DD Fan Motor Supply Pressure A-3EE Service Brake LH Pressure D-1FF Service Brake RH Pressure D-1

SOS Hydraulic Oil Sampling B-6

EE

FWD

FF

(LH)

(RH)

LH VIEW

29

19

23

AA BB CC

SOS

15

1519DD

35

10

11

12 14

2537

2638

181

7

6

9817

13

28 20452

5 2740

41

30

243 29

21

3635

3219

15

39 2322 16 33

34

1012

11

14

2537

181

76

98

17

13 28 20452

3826 30

2740

41

24

316

29

1933

32

21

363915

35 2322

34

SERVICE BRAKES COMPONENT LOCATIONS

FAN / BRAKE CONTROLIMPLEMENT / STEERING CIRCUIT

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NR

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THIS SCHEMATIC IS FOR THE 16M Motor GraderPART #: 254-7844 CH02Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letter

Components by number

YY

52

Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations

DRAIN / RETURN LINE

LINES GROUP COLOR DESCRIPTIONSIMPLEMENT & STEERING PUMP OUTPUT

FAN & BRAKE PUMP OUTPUT

STEERING CYLINDER CONTROL CIRCUIT

SECONDARY STEERING PUMP OUTPUT

SIDE SHIFT CYLINDER CONTROL CIRCUIT

CENTERSHIFT LOCK CONTROL CIRCUIT

SUPPLY LINE

PILOT SHUTOFF CIRCUIT

WHEEL LEAN CYLINDER CONTROL CIRCUIT

CIRCLE DRIVE MOTOR CONTROL CIRCUIT

CENTERSHIFT CYLINDER CONTROL CIRCUIT

ARTICULATION CYLINDER CONTROL CIRCUITSERVICE BRAKE CONTROL CIRCUIT

BLADE LIFT CYLINDER CONTROL CIRCUITS

BLADE TIP CYLINDER CONTROL CIRCUIT

IMPLEMENT & STEERING LOAD SENSE CIRCUITS

RIPPER LIFT CYLINDER CONTROL CIRCUIT

SNOW WING & PLOW CYLINDER CONTROL CIRCUITS

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

BB CCAA

SOS

DD

FF

EE

)(

)(

LS

P

T

A1

PS

A2

FAN/BRAKE PUMP

CENTER SHIFTLOCK

EF

P LS T

Ts

Ps

LE

RE

L

R

CL CR

TANK GPHYDRAULIC275-6574

BREATHER AS9R-9925

PUMP GPIMPLEMENT/STEERING246-4486

PUMP GPFAN/BRAKE257-6832

PUMP GPSECONDARYSTEER273-8714

ACCUMULATOR GPCE BRAKE260-9428

VALVE GPFAN/BRAKECONTROL251-8256

SCREEN(FAN/BRAKECONTROL)6E-5066

SCREEN(STEER PILOTMANIFOLDVALVE)6E-5066

VALVESHUTTLE(LOAD SIGNALRESOLVER)6R-7605

VALVE GPSTEERING PILOTMANIFOLD254-3415

SWIVELBLADE260-6502

CYLINDER GPBLADE TIP9T-8944

CYLINDER GPSIDE SHIFT257-5083

CYLINDER GPCENTER SHIFT262-1905

CYLINDER GPWHEEL LEAN289-3054

MOTOR GPCIRCLE DRIVE9T-5977

CYLINDER GPBLADE LIFT (RH)270-7538

CYLINDER GPBLADE LIFT (LH)2270-7538

CYLINDER GPARTICULATE290-8074

IMPLEMENT/STEERING

BLADE LIFT (LEFT) BLADE LIFT (RIGHT)ARTICULATION

BLADE TIPSIDE SHIFTCENTER SHIFTCIRCLE DRIVEWHEEL LEAN

LOCK GPCENTER SHIFT298-2600

VALVE GP 261-3278 (4-BANK)261-3281 (5-BANK)261-3283 (6-BANK)

SCREENFRONT IMPLEMENTCONTROL VALVE250-1420

VALVE GPCHECK (IMP/STEER)255-3631

VALVE GPCHECK(SEC STEER)9T-1013

SCREENREAR IMPLEMENTCONTROL VALVE250-1420

ACCUMULATORBLADE CUSHION219-8035

ACCUMULATORBLADE CUSHION219-8035

MANIFOLD GPBLADE CUSHION(NOTE C)253-1320

MANIFOLD GPBLADE CUSHION(NOTE C)253-1320

PLOW LIFT

FILTER GPRETURN249-2307

MANIFOLD GPPILOT SHUTOFFSOLENOID263-1790

FILTER GPPILOT191-9784

VALVE GPRELIEF(SEC STEER)9T-8071

VALVE GPCHECK(E)231-7701

VALVE GPCOOLERBYPASS266-1595

MOTOR GPFAN304-1005

CONTROL GPBRAKE PEDAL301-4129

VALVE GPSTEERINGCONTROL308-0935

CYLINDER GPRH STEERING267-3863

CYLINDER GPLH STEERING267-3863

VALVE GPIMPLEMENTCONTROL(FRONT)261-3272 (5-BANK)261-3273 (6-BANK)261-3274 (7-BANK)

PLOW ANGLE

RIPPERWING LIFTWING TILT

CYLINDER GPRIPPER LIFT113-5264

CYLINDER GPBLADE LIFT (RH)270-7538

ACCUMULATORBLADE CUSHION219-8035

B A B A B A B A B A B A B A

B A B A B A B A B A B A

B A

CYLINDER GPBLADE LIFT (LH)270-7538

ACCUMULATORBLADE CUSHION219-8035

B A

CONSTANTFORCE

ATTACHMENTVALVE GPCONTANT FORCE279-6521

VALVE GPCONTANT FORCE279-6521

WING CYLINDERS SYMBOLSSAME AS PLOW CYLINDERS

WING CYLINDERS SYMBOLSSAME AS PLOW CYLINDERS

PLOW LIFT CYLINDERPLOW ANGLE CYLINDER

CONNECTS TOBLADE LIFTRT VALVE

CONNECTS TOBLADE LIFTLT VALVE