• Author / Uploaded
• Richard Perez Medina

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INTERACTIVE SCHEMATIC Bookmarks

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Cover Page Tables Component Connector

Schematic Machine Views Chassis View Cab View Engine View

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EC-C2 EC-C3

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E-C60 E-C61

VIEW ALL CALLOUTS EC-C1

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ELECTRICAL SYMBOLS

HOTKEYS (Keyboard Shortcuts)

BASIC HYDRAULIC COMPONENT SYMBOLS

T

FUNCTION

KEYS

Zoom In Zoom Out Fit to Page Hand Tool Find

“CTRL” / “+” “CTRL” / “-” “CTRL” / “0” (zero) “SPACEBAR” (hold down) “CTRL” / “F”

Search

“CTRL” / “SHIFT” / “F”

Pressure Switch

Temperature Switch

Level Switch

Flow Switch

Circuit Breaker

Click here to view the Schematic Symbols and Definitions page

Pump or Motor

Variability

Fluid Conditioner

Spring (Adjustable)

UENR3228-04 January 2020

988K Wheel Loader Hydraulic System L8X1-UP LWX1-UP

© 2020 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos, “Caterpillar Yellow,” the “Power Edge” and Cat “Modern Hex” trade dress, as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.

SCHEMATIC SYMBOLS AND DEFINITIONS INTERNAL PASSAGEWAYS

VALVES ENVELOPES

Two Position

One Position

Three Position

PORTS

Two-way

Three-Way

FLOW IN ONE DIRECTION

FLOW ALLOWED IN EITHER DIRECTION

Infinite Positioning

Two Position

PARALLEL FLOW

PUMPS

Unidirectional

Three Position

BASIC HYDRAULIC COMPONENT SYMBOLS

FIXED DISPLACEMENT

CROSS FLOW

Pump or Motor

Variability

Fluid Conditioner

Spring (Adjustable)

Spring

Pressure Compensation

Control Valves

Line Restriction (Variable)

Restriction

Line Restriction (Fixed)

Line Restriction Variable and Pressure Compensated

2-Section Pump

Attachment

Pump: Variable and Pressure Compensated

Bidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

CYLINDERS

Four-Way

Unidirectional

Bidirectional

CONTROL AB

AB

P T

P T

Single Acting

FIXED DISPLACEMENT

Shifted Position

Normal Position

Infinite Position

CHECK

Basic Symbol

Spring Loaded

MOTORS

Double Acting

ACCUMULATORS

Shuttle

Unidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

Pilot Controlled

Spring Loaded Gas Charged

Unidirectional

Bidirectional MAIN AUX.

PILOT CONTROL

ROTATING SHAFTS

RELEASED PRESSURE

Unidirectional

External Return

Bidirectional

Bidirectional

Internal Return

REMOTE SUPPLY PRESSURE

Simplified

Complete

Internal Supply Pressure

Hydraulic Pneumatic Energy Triangles

COMBINATION CONTROLS

Solenoid

Solenoid or Manual

Solenoid and Pilot

Solenoid and Pilot or Manual

MEASUREMENT

LINES

Servo

Thermal

Detent

Crossing

Joining

Manual Shutoff

General Manual

Push Button

Pedal

Spring

Vented

Pressurized

Return Above Fluid Level

Return Below Fluid Level

ELECTRICAL SYMBOLS

HYDRAULIC SYMBOLS - ELECTRICAL G

Flow

FLUID STORAGE RESERVOIRS

MANUAL CONTROL

Push-pull Lever

Temperature

Pressure

M T

Transducer (Fluid)

Transducer (Gas / Air)

Generator

Electric Motor

Pressure Switch

Pressure Switch (Adjustable)

Temperature Switch

Electrical Wire

Pressure Switch

Temperature Switch

BASIC ELECTRICAL COMPONENT SYMBOLS

Level Switch

Circuit Breaker

HARNESS AND WIRE SYMBOLS Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).

Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it. Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component.

Flow Switch

L-C12 3E-5179

AG-C4 111-7898

1

Part Number: for Connector Plug

2 Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine. Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine. Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.

T

Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.

Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...) Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...)

L-C12 3E-5179 5A Fuse (5 Amps)

Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay. Solenoid: A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work. Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a permanent magnet. It has two coils (latch and unlatch) that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.

Receptacle Pin or Socket Number

Plug

9X-1123

Component Part Number

325-AG135 PK-14 Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".

Wire Gauge* Wire Color

*Wire gauge is shown in AWG (American Wire Gauge) but could also be shown in metric denoted with mm

1 2

Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.

1 2

Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.

COMPONENT LOCATION Schematic Location

Machine Location

Accumulator Gp - Brake Supply

E-2

1

Sensor Gp - Pressure Brake Oil

Accumulator Gp - Pilot Oil

B-11

2

Sensor Gp - Temperature (Front Axle)

Accumulator Gp - Ride Control

D-8

3

Sensor Gp - Temperature (Hydraulic Oil)

Actuator Gp - Pilot Control (Dump)

D-12

4

Sensor Gp - Temperature (Rear Axle)

Actuator Gp - Pilot Control (Lower)

D-13

5

Actuator Gp - Pilot Control (Rackback)

D-12

Actuator Gp - Pilot Control (Raiser)

Description

Description

Schematic Location

Machine Location

J-3

54

I-10, J-7

55*

B-3

56

H-7, I-13

57

Solenoid - Fan Pump

B-2

58

6

Spool - Secondary Steering Diverter

E-4

59

D-13

7

Switch As - Pressure (Fan Filter)

D-3

60

Bracket

B-5

8

Tank Gp - Hydraulic

B-4

61

Brake Gp - Parking

J-2

9

Valve - Load Check (LH Lift)

D-12

63

Breather (Hydraulic Tank)

B-3

10

Valve - Load Check (Tilt)

D-12

64

Coil As - Implement Pump

B-11

11

Valve As - Check (Primary Pilot Source)

D-7

65

Control Gp - Foot Brake

J-4

12

Valve Gp - Accumulator (Charging)

D-1

66

Cooler As - Oil Cooler (Front)

I-9

13

Valve Gp - Bank 2 (Steering)

E-6

67

Cooler As - Oil Cooler (Rear)

I-14

14

Valve Gp - Brake Control

I-4

68

Core As - Oil Cooler (Hydraulic)

D-3

15

Valve Gp - Brake Control (Parking)

I-3

69

Cylinder Gp - Lift (LH)

F-13

16

Valve Gp - Bypass (Hydraulic Fan)

E-3

70

Cylinder Gp - Lift (RH)

F-10

17

Valve Gp - Bypass (Thermal - Front)

J-10

71

Cylinder Gp - Steering (LH)

F-7

18

Valve Gp - Bypass (Thermal - Rear)

J-13

72

Cylinder Gp - Steering (RH)

F-7

19

Valve Gp - Check & Relief (Steering)

E-7

73

Cylinder Gp - Tilt

F-12

20

Valve Gp - Check (Control Valve)

C-14

74

Elbow As - Orifice

E-6

21

Valve Gp - Check (Pilot Pressure)

E-14

75

Filter Gp - Oil (Brake)

C-2

22

Valve Gp - Check (Ride Control)

C-9

76

Filter Gp - Oil (Case Drain) (Fan)

C-3

23

Valve Gp - Check (Secondary Steering)

D-6

77

Filter Gp - Oil (Case Drain) (Implement Pump)

B-10

24

Valve Gp - Check (Steering)

D-7

78

Filter Gp - Oil (Case Drain) (Steering Pump)

C-4

25

Valve Gp - Control (Cylinder)

E-14

79

Filter Gp - Oil (Fan)

D-3

26

Valve Gp - Diverter

E-4

80

Filter Gp - Oil (Front Axle Cooler)

I-10

27

Valve Gp - Fan Reversing

H-3

110

Filter Gp - Oil (Rear Axle Cooler)

J-13

28

Valve Gp - Manual Lowering

B-13

83

Fitting - Quick Discount (Implement Pump Case Air Bleed)

A-10

29

Valve Gp - Pilot (Stick Steering)

C-8

84

Fitting - Quick Discount (Pump Case Air Bleed)

C-5

30

Valve Gp - Pilot Pressure

C-13

85

Impeller

B-11

31

Valve Gp - Press Reducing (Implement Pilot Supply)

D-1

86

Indicator - Filter Bypass

C-2

32

Valve Gp - Press Reducing (Steering Pilot Supply)

D-1

87

Manifold Gp - Control

H-12

33

Valve Gp - Pressure Control (Steering)

E-6

88

Valve Gp - Pressure Reducing (Dead Engine Lower)

E-14

89

Valve Gp - Relief (Direct Operated)

E-5

90

Motor Gp - Piston (Main Fan)

D-2

Motor Gp - Piston (Reversing Fan)

G-4

Plug - Orifice (Ride Control)

D-9

35

Valve Gp - Relief (Implement Pump)

D-10

91

Pump & Motor Gp - Axle Oil Clr

I-11

36

Valve Gp - Relief (Lift Head End)

E-13

92

Pump Gp - Gear (Axle Oil Cooler)

H-12

37

Valve Gp - Relief (Lift Rod End)

E-13

93

Pump Gp - Gear (Secondary Steering)

D-4

38

Valve Gp - Relief (Steering)

E-6

94

Pump Gp - Piston (Basic Demand Fan) (STD)

B-2

39

Valve Gp - Relief (Tilt Head End)

E-12

95

Pump Gp - Piston (Brake, Pilot)

B-2

40

Valve Gp - Relief (Tilt Rod End)

E-12

96

Pump Gp - Piston (Implement)

B-11

41

Valve Gp - Ride Control

C-9

97

Pump Gp - Piston (Steering)

C-5

42

Valve Gp - Selector & Press Cont (Main Supply)

D-6

98

Screen - Cushion Orifice (1)

E-7

43

Valve Gp - Selector & Press Cont (Secondary Supply)

E-5

99

Screen - Cushion Orifice (2)

E-6

44

Valve Gp - Shuttle (Dead Engine Lower)

E-13

100

Screen (Hydraulic Tank)

B-4

45

Valve Gp - Shuttle (Steering)

Screen As

B-5

46

Valve Gp - Solenoid (Axle Oil Cooler)

Screen Gp - Steering

B-4

47

Valve Gp - Solenoid (Excess Flow)

Screw - Bleeder

F-12

48

Sensor - Pressure (Hydraulic Oil) (Steering)

C-6

Sensor - Pressure (Implement Pump)

34

E-6

101

H-12

102

E-7

103

Valve Gp - Solenoid (Implement Pilot)

D-14

104

49

Valve Gp - Solenoid (Lift)

C-14

105

B-12

50

Valve Gp - Solenoid (Ride Control Activation)

D-9

106

Sensor Gp - Pressure (Brake Accumulator)

D-2

51

Valve Gp - Solenoid (Ride Control)

C-9

107

Sensor Gp - Pressure (Parking)

I-2

52

Valve Gp - Steering Neutralizer (LH)

C-7

108

Sensor Gp - Pressure (Steering Valve)

D-6

53

Valve Gp - Steering Neutralizer (RH)

C-7

109

Check part numbers in Parts Manual for your specific machine *NOTE: NOT SHOWN ON GRAPHICS

TAP LOCATION Tap Number A

Front Brake Pressure

Schematic Location I-8

B

Rear Brake Pressure

I-7

Description

AA

Implement Pilot Pressure

B-12

BB

Brake Charge Pressure

C-2

CC

Fan Charge Pressure

B-3

DD

Front Axle Accumulator Pressure

D-2

EE

Rear Axle Accumulator Pressure

E-2

FF

Tilt Rod End Line Relief Pressure

E-12

GG

Tilt Head End Line Relief Pressure

E-12

JJ

Pilot Supply Port

D-1

SOS

Oil Sampling Port

D-3

14

13

12

11

10

8

9

7

6

5

4

3

2

1

IMPELLER CLUTCH PEDAL POSITION SIGNAL (TO TRANSMISSION CONTROL)

(72) VALVE GP BYPASS (THERMAL-REAR) 260-3789

(12) CONTROL GP FOOT BRAKE 305-5531

STOPLAMP SW

FRONT AXLE

(28) FILTER GP OIL (AXLE COOLER) REAR 230-3633

(71) VALVE GP BYPASS (THERMAL-FRONT) 260-3789

(9) BRAKE GP PARKING 380-3895

THROTTLE LOCK DISCONNECT SW

J

(52) SENSOR GP PARKING BRAKE OIL PRESSURE 344-7391

(55) SENSOR GP FRONT AXLE OIL TEMP 288-8390

(14) COOLER AS REAR OIL COOLER 340-9352

(69) VALVE GP BRAKE CONTROL (PARKING) 545-7861

(13) COOLER AS FRONT OIL COOLER 340-9352

C

(27) FILTER GP OIL (AXLE COOLER) FRONT 230-3633

I (57) SENSOR GP TEMPERATURE (REAR AXLE) 288-8390

BRAKE VALVE RETURN

B

I P

(55) SENSOR GP TEMPERATURE (FRONT AXLE) 288-8390

(102) VALVE GP SOLENOID (AXLE OIL CLR) 149-2610

A FRONT BRAKE SUPPLY

T

(68) VALVE GP BRAKE CONTROL 388-6321

REAR BRAKE SUPPLY

36 Page,

(36) PUMP AND MOTOR GP AXLE OIL CLR 447-0798

PARK BRAKE RETURN

(33) MANIFOLD GP CONTROL 112-2240

H

H

(37) PUMP GP GEAR (AXLE OIL COOLER) 333-3781

(57) SENSOR GP REAR AXLE OIL TEMP 288-8390

IMPLEMENT PILOT SUPPLY

(110) VALVE GP FAN REVERSING 366-5759 HYDRAULIC CIRCUIT COLOR DESCRIPTIONS PILOT PUMP OUTPUT IMPLEMENT PUMP OUTPUT SECONDARY STEERING PUMP OUTPUT TILT CYLINDER CONTROL CIRCUIT STEERING CIRCUIT HYDRAULIC OIL COOLING CIRCUIT SUPPLY LINE REAR PUMP COOILING CIRCUIT BRAKE CIRCUIT DRAIN / RETURN LINE LIFT CYLINDER CONTROL CIRCUIT AXLE COOLING FAN PUMP OUTPUT FRONT PUMP COOILING CIRCUIT

(34) MOTOR GP PISTON (REVERSING FAN) 333-3794

AXLE OIL COOLING PUMP INLET

G

G

REAR AXLE FAN MOTOR DRAIN

AXLE OIL COOLING PUMP RTN

LINE PATTERNS Pressure Line

COOLER SUPPLY

RIGHT TURN

(16) CYLINDER GP LIFT (LH) 355-7378 490-7560 (LOGGER)

Drain / Return Lines

(17) CYLINDER GP LIFT (RH) 355-7377 490-7561 (LOGGER)

(20) CYLINDER GP TILT 354-0798 490-7324 (LOGGER)

Pilot / Load Sensing Pressure FAN MOTOR SUPPLY

(19) CYLINDER GP STEERING (RH) 313-7668

(18) CYLINDER GP STEERING (LH) 313-7668

Air Line Component Group

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

YY

(89) VALVE GP PRESSURE REDUCING (DEAD ENGINE LOWER) 370-0438 (79) VALVE GP CONTROL (CYLINDERS) 362-2165 (2 FUNCTION) 362-3144 (3 FUNCTION)

(88) VALVE GP PRESSURE CONTROL (STEERING) 361-2429

(48) SCREW BLEEDER 9F-2167

(100) VALVE GP SHUTTLE (DEAD ENGINE LOWER) (93) VALVE GP 4T-1860 RELIEF (LIFT ROD END) 423-7707

IMPLEMENT SUPPLY

FF

GG

(95) VALVE GP RELIEF (TILT HEAD END) 423-7709

HH

(96) VALVE GP RELIEF (TILT ROD END) 423-7706

(75) VALVE GP CHECK (PILOT PRESS) 4T-5896

VALVE GP RELIEF (RH AUX) 423-7706

1.2 mm

2.1 mm

(99) VALVE GP SELECTOR (21) ELBOW AS (SECONDRY SUPPLY) ORIFICE 6E-5566 335-3968

RACKBACK SOLENOID

(6) ACTUATOR GP (RACKBACK) 217-6720

3RD FUNCTION REARWARD SOL

ACTUATOR GP (REARWARD) 217-6720

D

(104) VALVE GP SOLENOID (IMP PILOT) 396-1209

(44) SCREEN GP CUSHION ORIFICE (2) 6E-5066

(7) ACTUATOR GP (RAISER) 217-6720

(85) VALVE GP PILOT PRESSURE 6E-1291

DUMP SOLENOID

(105) VALVE GP SOLENOID (LIFT) 147-1223

3RD FUNCTION FORWARD SOL

ACTUATOR GP (FORWARD) 217-6719

(73) VALVE GP CHECK AND RELIEF (STEERING) 370-6923

(65) VALVE AS CHECK (PRIMARY PILOT) 123-4750

(77) VALVE GP CHECK (SECONDARY STEERING) 185-4026 LEFT NEUT

RIGHT NEUT

(109) VALVE GP STEERING NEUTRALIZER (RH) (108) VALVE GP 296-5662 STEERING NEUTRALIZER (LH)

QUICK COUPLER SUPPLY

(83) VALVE GP MANUAL LOWERING 112-1817

B

IMPLEMENT PILOT SUPPLY

(53) SENSOR GP PRESSURE (STEERING VALVE) 344-7389

(30) FITTING QUICK DISCOUNT 6V3965 PUMP CASE FILL PORT PUMP CASE AIR BLEED

PS

(87) VALVE GP PRESS REDU (STEERING PILOT) 498-7475

(66) VALVE GP ACCUMULATOR (CHARGE) 520-1857

PARK BRAKE RETURN

C

(23) FILTER GP OIL (CASE DRAIN FAN) 376-6640

(22) FILTER GP OIL (BRAKE) 295-6259

(32) INDICATOR FILTER BYPASS 490-0662

AUTOLUBE RETURN

BB

AUTOLUBE SUPPLY

(47) SCREEN GP (STEERING) 7J-2656

(58) SOLENOID FAN PUMP 272-9660

(61) TANK GP HYDRAULIC 361-8247

B CC

(10) BREATHER (HYDRAULIC TANK) 157-7911

IMPLEMENT SUPPLY

(46) SCREEN AS 9T-9227 IMPLEMENT PUMP CASE DRAIN BRAKE VALVE RETURN

PUMP CASE AIR BLEED

(29) FITTING QUICK DISCONNECT 6V-3965

T1

(25) FILTER GP OIL (CASE DRAIN STEERING) 376-6640

AXLE OIL COOLING RETURN

HYDRAULIC RESONATOR

(41) PUMP GP PISTON (IMPLEMENT) 384-9438

(60) SWITCH AS PRESSURE (FAN FILTER) 376-7257

IMPLEMENT RETURN

(31) IMPELLER 146-8990

IMPLEMENT PILOT SUPPLY

P

(8) BRACKET 378-5363

PUMP CASE FILL PORT

D

JJ

PS1

296-5662

IMPLEMENT PILOT DRAIN

(11) COIL AS IMPLEMENT PUMP 373-1585

SOS

(42) PUMP GP PISTON (STEERING) 362-9620

(2) ACCUMULATOR GP PILOT OIL 245-2975 (CHARGED) 455-1904 (SELO APPROVED)

AA

(26) FILTER GP OIL (FAN) 416-8308

A2

A1

(86) VALVE GP PRESS REDU (IMPLEMENT PILOT) 488-2889

PT1

QUICK COUPLER RETURN

U

(51) SENSOR GP BRAKE ACCU PRESSURE 344-7391

3800 kPa

(49) SENSOR GP PRESSURE (HYDRAULIC OIL STEERING) 349-1178

STRG

(76) VALVE GP CHECK (RIDE CONTROL) 566-4768

(50) SENSOR GP PRESSURE (IMPLEMENT) 349-1178

FRONT BRAKE SUPPLY

PT2

(84) VALVE GP PILOT (STICK STEERING) 249-5615

(97) VALVE GP RIDE CONTROL 462-1793

E

EE

(98) VALVE GP SELECTOR (MAIN SUPPLY) 6E-5566

(78) VALVE GP CHECK (STEERING) 149-4617

(107) VALVE GP SOLENOID (RIDE CONTROL) 251-3268

(63) VALVE CHECK (LH LIFT) 102-4156

(74) VALVE GP CHECK (CONTROL VALVE) 9T-1013

(15) CORE AS OIL COOLER (HYDRAULIC) 372-9123 (34) MOTOR GP PISTON (MAIN FAN) 214-1099

REAR BRAKE SUPPLY

(38) PUMP GP GEAR (SECONDRY STEERING) 562-0951

U

(5) ACTUATOR GP (LOWER) LOWER SOLENOID 217-6719

C

(106) VALVE GP SOLENOID (RIDE CONTROL ACTIVATION) 352-2734

(64) VALVE CHECK (TILT) 102-4156

(4) ACTUATOR GP (DUMP) 217-6719

(70) VALVE GP BYPASS (HYDRAULIC FAN) 459-1718

(90) VALVE GP RELIEF (DIRECT OPERATED) 377-2231

HYDRAC ON/OFF

(35) PLUG ORIFICE (RIDE CONTROL) 1T-0936

F

(1) ACCUMULATOR GP BRAKE SUPPLY 516-6260 516-6288 CE APPROVED 350-5576 CE/CRN APPROVED

DD

(91) VALVE GP RELIEF (IMPLEMENT) 143-8912

Component Name

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

(59) SPOOL SECONDRY STEERING DIVERTER 112-9636

(94) VALVE GP RELIEF (STEERING) 4T-7581

(3) ACCUMULATOR RIDE CONTROL (CHARGED) 480-1570 CE 480-1572 NACD/CA

VALVE CHECK (3RD FUNCTION) 102-4156

(52) VALVE GP - CONTROL 138-1234 Part Number

34500 kPa

(92) VALVE GP RELIEF (LIFT HEAD END) 423-7708 RAISE SOLENOID

Callout Number

(80) VALVE GP DIVERTER 373-5855

(103) VALVE GP SOLENOID (EXCESS FLOW) 313-7668

Connectors (By letter)

D

(Machine Location from Component LocationsTable)

II

VALVE GP RELIEF (LH AUX) 423-7706

DL

(67) VALVE GP BANK 2 (STEERING) 361-2413

(43) SCREEN GP (101) VALVE GP CUSHION SHUTTLE ORIFICE (1) (STEERING) 6E-5066 260-8590

EXCESS FLOW

F

E

DL

SCREW BLEEDER (AUX) 9F-2167

U

(Dimensions: 48 inches x 35 inches)

(54) SENSOR GP BRAKE OIL PRESSURE 344-7390

U

UENR3228-04

J

(24) FILTER GP OIL (CASE DRAIN) 376-6640

(45) SCREEN (HYDRAULIC TANK) 118-8693

AXLE OIL COOLING PUMP INLET

(56) SENSOR GP TEMPERATURE (HYDRAULIC OIL) 256-6453

(40) PUMP GP PISTON (PILOT, BRAKE) 333-3788

(39) PUMP GP PISTON (BASIC DEMAND FAN) 325-9784 (STD) 443-8469 (LOGGER)

IMPLEMENT PUMP INLET

A

A THIS SCHEMATIC IS FOR THE 988K WHEEL LOADER HYDRAULIC SYSTEM MEDIA NUMBER: UENR3228-04 SCHEMATIC PART NUMBER: 363-6751, CHANGE: 04, VERSION: SCHEMATIC PART NUMBER (BRAKE): 380-2670, CHANGE: 01, VERSION: Components are shown installed on a fully operable machine with the key and engine off, transmission shifter in neutral and with parking brake set. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations. Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.

14

13

12

11

10

9

8

7

6

5

4

3

2

1

CAB - FRONT VIEW VIEW ALL CALLOUTS

84

68

A

B

12

COOLING - RIGHT VIEW VIEW ALL CALLOUTS

15 14 71 34 37 70

13 72

110

102

33

MACHINE - BOTTOM VIEW VIEW ALL CALLOUTS

57

38

80

59

90

MACHINE - RIGHT VIEW VIEW ALL CALLOUTS

1

91

B

56

96

32

4

51

A

48

64

79

48 95

GG

FF

6

BB

83

7

60

66

93

92

SOS

22

89

75

86

26 8

5

104

3 DD 105 27

28

36

VIEW OF AREA “A”

87

JJ

EE

100

85

63

VIEW OF AREA “B” (ROTATED FOR CLARITY)

74

MACHINE - TOP VIEW VIEW ALL CALLOUTS

53

77

98

99

49

94

16 78 30

42

31

35

18

97

76

65

9

40 88 39

C

58

43

67

108 52 44

CC 50

103 11

54

AA 29

47

19

106

107

17

109 101

20

45 41

24

23

25

45

46

61

10

21 2

69

73 VIEW OF AREA “C”