INTERACTIVE SCHEMATIC

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Tap Views

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Bookmarks X

EC-C3EC-C2 E-C60

EC-C1

E-C61

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Hydraulic System

©2011 Caterpillar, All Rights Reserved Printed in U.S.A.

Volume 2 of 2

RENR9044-02February 2011

24M Motor Grader

B9K1-336

Volume 1 of 2

Volume 1 of 2 COMPONENT LOCATION

Description PartNumber

MachineLocation

SchematicLocation

Accumulator Gp - LH Blade Cushion 219-8035 1 E-8 , F-2Accumulator Gp - RH Blade Cushion 219-8035 2 D-8 , F-1Cylinder Gp - Articulation 273-1733 3 D-4Cylinder Gp - Blade Tip 143-5988 4 D-5Cylinder Gp - Center Shift 276-7646 5 D-7Cylinder Gp - LH Blade Lift 276-7646 6 E-7 , F-3Cylinder Gp - LH Steering 270-8686 7 C-2Cylinder Gp - LH Wheel Lean 117-0836 8 E-7Cylinder Gp - RH Blade Lift 276-7646 9 D-8 , F-1Cylinder Gp - RH Steering 270-8686 10 C-2Cylinder Gp - RH Wheel Lean 117-0836 11 E-6Cylinder Gp - Ripper 113-7754 12 D-4Cylinder Gp - Side Shift 141-2914 13 E-5Filter Gp - Case Drain 197-1993 14 A-8Filter Gp - Pilot 197-1993 15 B-4Filter Gp - Return 341-2079 16 A-8Filter Gp - Return 341-2079 17 A-8Manifold Gp - Pilot Shutoff Solenoid 306-5134 18 B-5

Motor Gp - Circle Drive 121-9270 19 E-4Pump Gp - Implement & Steering 268-4763 20 A-6Pump Gp - Secondary Steering 117-5098 21 A-5Screen - Left Implement Control Valve 250-1420 22 E-4Screen - Right Implement Control Valve 250-1420 23 B-4Screen - Steer Pilot Manifold Valve 6E-5066 24 B-1Sensor Gp - Pressure (Implement Pump) 221-3404 25 B-6Switch As - Pressure (Case Drain Filter Bypass) 253-2673 26 A-8Switch As - Pressure (Pilot Filter Bypass) 253-2673 27 A-4Switch As - Pressure (Return Filter Bypass) 164-7577 28 A-8Switch As - Pressure (Return Filter Bypass) 164-7577 29 A-8Swivel Gp 260-6502 30 E-6Tank Gp - Hydraulic Oil 286-2964 31 B-7Valve - Shuttle (Load Signal Resolver) 6R-7605 32 A-3Valve Gp - Breaker Relief 117-9152 33 B-8Valve Gp - Check 193-9230 34 A-5Valve Gp - Check (Center Shift Cylinder) 223-2459 35 D-7Valve Gp - Check (Implement / Steer) 255-3631 36 A-3Valve Gp - Check (LH Blade Cylinder) 223-2459 37 E-7 , E-2Valve Gp - Check (RH Blade Cylinder) 223-2459 38 D-8 , E-1Valve Gp - Circle Flow Divider 112-9049 39 E-5Valve Gp - Left Implement Control 270-1612 40 F-4Valve Gp - Right Implement Control 270-1613 41 C-5Valve Gp - Ripper Sequence 140-0357 42 E-4Valve Gp - Secondary Steering Control 117-5099 43 A-4Valve Gp - Steering Control 308-0937 44 C-2Valve Gp - Steering Pilot Manifold 254-3415 45 C-1

Valve Gp - LH Constant Force 279-6521 46 E-2Valve Gp - RH Constant Force 279-6521 47 F-1

Constant Force Attachments

Volume 2 of 2 COMPONENT LOCATION

Description PartNumber

MachineLocation

SchematicLocation

Accumulator Gp - Brake 219-7282 50 F-7Adjuster Gp - LHR Service Brake Slack 2G-6535 51 D-2Adjuster Gp - RHR Service Brake Slack 2G-6535 52 E-2Control Gp - Service Brake Pedal 294-0978 53 E-4Filter Gp - Differential Lock 249-1750 54 B-4Manifold Gp - Fan/Brake Charge Control 272-0984 55 E-7Manifold Gp - Parking Brake Control 283-9560 56 F-6Motor Gp - Fan 213-5268 57 D-5Pump & Motor Gp - Brake (Electric) 5T-1060 58

B-7Pump Gp - Fan/Brake & Diff Lock 270-2720 59

A-5

Pump Gp - Transmission Charge 270-2721 60 B-7Sensor Gp - Pressure (Brake Accumulator) 237-0957 61 E-7Sensor Gp - Temperature (Hydraulic Oil) 264-4297 62 C-5Switch As - Differential Lock Filter Bypass 227-6744 63 B-4Switch As - Parking Brake Pressure 229-1537 64 F-5Valve Gp - Check (Electric Brake Pump & Motor) 164-7474 65 E-8Valve Gp - Check (Fan Anti Cavitation) 193-9230 66 D-6Valve Gp - Cooler Bypass 200-6311 67 C-5Valve Gp - Differential Lock Relief 266-1601 68 B-3Valve Gp - Differential Lock Solenoid 277-8874 69 A-3

Volume 1 of 1TAP LOCATION

TapNumber Description Schematic

LocationAA Implement Pump Pressure B-7BB

Implement / Steering Pump PressureB-6

CC

Implement / Steering Pump Load Sense

B-6DD Implement B-5EE Pilot Supply Pressure A-4FF Pilot Filter Bypass Pressure B-4GG Case Drain Filter Bypass Pressue A-8HH Return Filter Bypass Pressure A-8JJ Return Filter Bypass Pressure A-8

SOS 1 Hydraulic Oil Sampling A-4SOS 2 Hydraulic Return Oil Sampling A-8SOS 3 Hydraulic Return Oil Sampling A-8

Volume 2 of 2 TAP LOCATION

TapNumber Description Schematic

LocationKK Fan/Brake Pump Pressure C-7LL Differential Pump Pressure B-4MM Differential Lock Pressure A-3NN Right Hand Rear Brake Pressure E-3OO Left Hand Rear Brake Pressure C-3

FLUID POWER SYMBOLS

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

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

SOLENOIDor MANUAL

SOLENOIDand 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

ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)

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)

T

Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

VOLUME 1 of 2

SCHEMATIC PART NUMBER: 266-1589, CHANGE: 03, VERSION: -MEDIA NUMBER: RENR9044-02

THIS SCHEMATIC IS FOR THE _24M MOTOR GRADER HYDRAULIC SYSTEM

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)YY

DRAIN / RETURN LINE

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT / STEERIMG PUMPS OUTPUT

FAN / BRAKE PUMP OUTPUT

STEERING CYLINDER CONTROL CIRCUIT

PILOT SHUTOFF CIRCUIT

RIPPER CYLINDER CONTROL CIRCUIT

TRANSMISSION PUMP OUTPUT

SECONDARY STEERING PUMP OUTPUT

SUPPLY LINE

WHEEL LEAN CYLINDERS CONTOL CIRCUIT

CIRCLE DRIVE MOTOR CONTROL CIRCUIT

CENTER SHIFT CYLINDER CONTROL CIRCUIT

ARTICULATION CYLINDER CONTROL CIRCUITSERVICE BRAKE CYLINDERS CONTROL CIRCUIT

PARKING BRAKE CYLINDERS CONTROL CIRUIT

ELECTRIC BRAKE PUMP OUTPUTDIFFERENTIAL LOCK PUMP OUTPUT AND CONTROL CIRCUIT

BLADE TIP CYLINDER CONTRO CIRCUIT

SIDE SHIFT CYLINDER CONTROL CIRCUIT

IMPLEMENT AND STEERING PUMP LOAD SENSE CIRCUIT

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

)(

BLADE LIFT WHEEL LEAN SIDE SHIFT CIRCLE DRIVE RIPPER

GaugeP1

P LS T

Ts

Ps

LE

RE

L

R

CL CR

SOS

QD

)(

LH BLADELIFT VALVESECTION

RH BLADELIFT VALVESECTION

(24) SCREEN(STEER PILOT

MANIFOLDVALVE)

6E-5066

(45) VALVE GPSTEERING PILOTMANIFOLD254-3415

(44) VALVE GPSTEERINGCONTROL308-0937

(10) CYLINDER GPRH STEERING270-8686

(7) CYLINDER GPLH STEERING270-8686

(32) VALVESHUTTLE(LOAD SIGNALRESOLVER)6R-7605

(23) SCREENREAR IMPLEMENT

CONTROL VALVE250-1420

(22) SCREENLEFT IMPLEMENTCONTROL VALVE

250-1420

(15) FILTER GPPILOT197-1993

(18) MANIFOLD GPPILOT SHUTOFFSOLENOID306-5134

(20) PUMP GPIMPLEMENT

AND STEERING268-4763

(21) PUMP GPSECONDARY

STEERING117-5098

(43) VALVE GPSEC STEERCONTROL117-5099

(36) VALVE GPCHECKIMP/STEER255-3631

(31) TANK GPHYDRAULIC286-2964

(33) VALVE GPBREAKER

RELIEF117-9152

(14) FILTER GPCASE DRAIN197-1993

(40) VALVE GPLEFT IMPLEMENTCONTROL270-1612

(41) VALVE GPRIGHT IMPLEMENTCONTROL270-1613

(5) CYLINDER GPCENTER SHIFT276-7646

(9) CYLINDER GPRH BLADE LIFT276-7646

(6) CYLINDER GPLH BLADE LIFT276-7646

(11) CYLINDER GPRH WHEEL LEAN117-0836

(8) CYLINDER GPLH WHEEL LEAN117-0836

(13) CYLINDER GPSIDE SHIFT141-2914

(4) CYLINDER GPBLADE TIP143-5988

(30) SWIVEL GP260-6502

(42) VALVE GPRIPPER SEQUENCE140-0357

(3) CYLINDER GPARTICULATION273-1733

(12) CYLINDER GPRIPPER113-7754

(19) MOTOR GPCIRCLE DRIVE121-9270

(39) VALVE GPCIRCLE FLOWDIVIDER112-9049

(1) ACCUMULATOR GPLH BLADE CUSHION

219-8035

(2) ACCUMULATOR GPRH BLADE CUSHION

219-8035

(37) VALVE GPCHECK(LH BLADE CYL)223-2459

(38) VALVE GPCHECK(RH BLADE CYL)223-2459

(35) VALVE GPCHECK(CENTER SHIFT CYL)223-2459

(37) VALVE GPCHECK(LH BLADE CYL)223-2459

(38) VALVE GPCHECK(RH BLADE CYL)223-2459

(46) VALVE GPLH CONSTANT FORCE279-6521

(47) VALVE GPRH CONSTANT FORCE279-6521

(9) CYLINDER GPRH BLADE LIFT

276-7646

(2) ACCUMULATOR GPRH BLADE CUSHION219-8035

(6) CYLINDER GPLH BLADE LIFT

276-7646

(1) ACCUMULATOR GPLH BLADE CUSHION219-8035

(34) VALVE GPCHECK

193-9230

FROM FAN PUMP & MOTOR CASE DRAINSLOC VOL 2 SEC B-1TO FAN PUMP

LOC VOL 2 SEC A-8

FROM BRAKE MANIFOLDLOC VOL 2 SEC C-8

FROM COOLER BYPASS VALVELOC VOL 2 SEC C-8

TO ELEC. BRAKE PUMPLOC VOL 2 SEC A-8

(25) SENSOR GPPRESSURE

IMPLEMENT PUMP221-3404

(27) SWITCH ASPRESSUREPILOT FILTERBYPASS253-2673

(26) SWITCHASPRESSURECASE DRAINFILTERBYPASS253-2673

(28) SWITCHASPRESSURERETURNFILTERBYPASS164-7577

(29) SWITCHPRESSURERETURN FILTERBYPASS164-7577

BLADE LIFT CENTER SHIFT BLADE TIP CIRCLE DRIVE ARTICULATION

IMPLEMENT IMPLEMENT/STEERING

CONSTANT FORCE ATTACHMENT

EESOS1

DD

AACC

BB

FF

GG

HH

SOS2

JJ

SOS3

(16) FLTRGPRETURN341-2079

(17) FILTER GPRETURN341-2079

Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

VOLUME 2 of 2: DESCRIPTION FROM COVER PAGE

SCHEMATIC PART NUMBER: 266-1589, CHANGE: 03, VERSION: -MEDIA NUMBER: RENR9044-02

THIS SCHEMATIC IS FOR THE _24M MOTOR GRADER HYDRAULIC SYSTEM

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)YY

DRAIN / RETURN LINE

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT / STEERIMG PUMPS OUTPUT

FAN / BRAKE PUMP OUTPUT

STEERING CYLINDER CONTROL CIRCUIT

PILOT SHUTOFF CIRCUIT

RIPPER CYLINDER CONTROL CIRCUIT

TRANSMISSION PUMP OUTPUT

SECONDARY STEERING PUMP OUTPUT

SUPPLY LINE

WHEEL LEAN CYLINDERS CONTOL CIRCUIT

CIRCLE DRIVE MOTOR CONTROL CIRCUIT

CENTER SHIFT CYLINDER CONTROL CIRCUIT

ARTICULATION CYLINDER CONTROL CIRCUITSERVICE BRAKE CYLINDERS CONTROL CIRCUIT

PARKING BRAKE CYLINDERS CONTROL CIRUIT

ELECTRIC BRAKE PUMP OUTPUTDIFFERENTIAL LOCK PUMP OUTPUT AND CONTROL CIRCUIT

BLADE TIP CYLINDER CONTRO CIRCUIT

SIDE SHIFT CYLINDER CONTROL CIRCUIT

IMPLEMENT AND STEERING PUMP LOAD SENSE CIRCUIT

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

TRANS CHARGE

DIFFERENTIALBEARING LUBE

FAN/BRAKE PUMP

(59) PUMP GPFAN/BRAKE

& DIFF LOCK270-2720

(67) VALVE GPCOOLERBYPASS200-6311

(57) MOTOR GPFAN213-5268

(52) ADJUSTER GPRHR SERVICE BRAKESLACK2G-6535

(53) CONTROL GPSERVICE BRAKE PEDAL294-0978

(56) MANIFOLD GPPARKING BRAKE CONTROL 283-9560

(64) SWITCH ASPARKING BRAKEPRESSURE229-1537

(51) ADJUSTER GPLHR SERVICE BRAKESLACK2G-6535

(68) VALVE GPDIFF LOCKRELIEF266-1601

(54) FILTER GPDIFF LOCK249-1750

(69) VALVE GPDIFF LOCKSOLENOID

277-8874

DIFFERENTIALLOCK

(58) PUMP & MOTOR GPBRAKE (ELECTRIC)

5T-1060

(60) PUMP GPTRANSMISSION

CHARGE270-2721

(66) VALVE GPCHECK

FANANTI CAVITATION

193-9230

(55) MANIFOLD GPFAN/BRAKE CHARGECONTROL272-0984

(50) ACCUMULATOR GPBRAKE219-7282

(65) VALVE GPCHECK

ELECTRICBRAKE PUMP

& MOTOR164-7474

TO CASE DRAIN FILTERLOC VOL 1 SEC A-6

FROM FAN SUCTION PORTLOC VOL 1 SEC A-7

TO RETURN MANIFOLDLOC VOL 1 SEC A-3

TO TANKLOC VOL 1 SEC A-3

FROM TANK SUCTION PORTLOC VOL 1 SEC A-7

(61) SENSOR GPPRESSURE

(BRAKE ACCUMULATOR)

237-0957

(63) SWITCH ASDIFF LOCKFILTERBYPASS227-6744

(62) SENSOR GPTEMPERATUREHYDRAULIC OIL264-4297

LL

MM

KK

NN

OO

MACHINE COMPONENT LOCATIONS 1

47

47

46

4645

4544

44

43

43

42

42

41

41

40

40

39

39

38

38

37

37

36

36

35

35

34

34

33

33 32

32

31

31

30

30

29

29

28

28

27

27

26

26

25

25

24

24

23

2322

22

21

21

20

20

19

19

18

18

17

17

16

16

15

15

14

14

13

13

12

12

11

11

10

109

9

8

8

7

7

6

6 5

54

4

43

3

3

2

21

1

MACHINE COMPONENT LOCATIONS 2

69

69

68

68

67

67

66

66

65

65

64

64

63

63

62

62

61

61

60

60

59

59

58

58

57

57

56

56

55

55

54

54

53

53

52

52

51

51

50

50

DIFFERENTIAL LOCK

MM

LL

69

6863

54

FILTERS AND HYDRAULIC TANK

FF

GG

SOS3

SOS2

HH

JJ

31

29

28

27

26

17

16

15

14

IMPLEMENT/STEER PUMPS

20

CCBBAA

PILOT SHUTOFF MANIFOLD

18

EESOS1DD

SERVICE BRAKES

65

OO

NN

KK

58

56

55

53

52

51

50