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Schematic Symbolsand Definitions page

INTERACTIVE SCHEMATIC

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Cover Page

Tables

Schematic

Machine Views

Component

Connector

Chassis View

Cab View

Engine View

Features

Options

Bookmarks X

EC-C3

EC-C2 E-C60

EC-C1

E-C61

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FUNCTION

Zoom In

HOTKEYS (Keyboard Shortcuts)

Zoom Out

Fit to Page

Hand Tool

“CTRL” / “+”

KEYS

“CTRL” / “-”

“CTRL” / “0” (zero)

“SPACEBAR” (hold down)

Find “CTRL” / “F”

Pressure

SwitchTemperature

SwitchLevel

SwitchFlow

Switch Circuit Breaker

T

ELECTRICAL SYMBOLS

Spring

(Adjustable)

Variability

Fluid

Conditioner

Pump

or Motor

BASIC HYDRAULIC

COMPONENT SYMBOLS

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SCHEMATIC SYMBOLS AND DEFINITIONS

HYDRAULIC SYMBOLS - ELECTRICAL

Transducer (Fluid)

Transducer (Gas / Air)

G

Generator ElectricalWire

PressureSwitch

M

ElectricMotor

Pressure Switch(Adjustable)

TemperatureSwitch

PressureSwitch

TemperatureSwitch

LevelSwitch

Flow

Switch Circuit Breaker

T

ELECTRICAL SYMBOLS

Spring

Control

Valves

Restriction Line Restriction

(Fixed)

2-Section

Pump

MAIN AUX.

Spring

(Adjustable)

Variability

Line Restriction

(Variable)

Pressure

Compensation

Pump: Variable and

Pressure Compensate

Hydraulic Pneumatic

Energy Triangles

Fluid

Conditioner

Attachment

Pump

or Motor

BASIC HYDRAULIC

COMPONENT SYMBOLS

Line Restriction

Variable and Pressure

Compensated

Vented Pressurized Return Above Fluid Level Return Below Fluid Le

FLUID STORAGE RESERVOIRS

Pressure Temperature Flow

MEASUREMENT

Unidirectional Bidirectional

ROTATING SHAFTS

One Position Two Position Three Position

Two-way Three-Way Four-Way

ENVELOPES

PORTS

CONTROL

Basic

SymbolSpring

Loaded

Normal Position

A B

P T

A B

P T

Shifted Position Infinite Position

Shuttle Pilot

Controlled

VALVES

CHECK

Solenoid

or Manual

Solenoid

and Pilot

Solenoid and

Pilot or Manual

Solenoid Servo Thermal Detent

COMBINATION CONTROLS

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 indicatesthat 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.

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.

BASIC ELECTRICAL COMPONENT SYMBOLS

Push-pull Lever PedalGeneral Manual Push Button SpringManual Shutoff

MANUAL CONTROL

External Return Internal Return

Simplified CompleteInternal

Supply Pressure

RELEASED PRESSURE

REMOTE SUPPLY PRESSURE

PILOT CONTROL

Spring Loaded Gas Charged

ACCUMULATORS

Crossing Joining

LINES

Double ActingSingle Acting

CYLINDERSUnidirectional

Bidirectional

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT

NON- COMPENSATED

PUMPS

Unidirectional

Bidirectional

Unidirectional

Bidirectional

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT

NON- COMPENSATED

MOTORS

Unidirectional

Bidirectional

Two

Position

Infinite

Positioning

FLOW IN ONE

DIRECTION

FLOW ALLOWED IN

EITHER DIRECTION

Three

Position

CROSS

FLOW

PARALLEL

FLOW

INTERNAL PASSAGEWAYS

1

2

AG-C4

111-7898

L-C12

3E-5179

Pin or Socket Nu

Part Number: for

Connector Plug

Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)

Plug Receptacle

Wire, Cable, or Harness Assembly Identification:

Includes Harness Identification Letters and Harness

Connector Serialization Codes (see sample).

Harness Connector Serialization Code: The "C" stands fo

"Connector" and the number indicates which connector in t

harness (C1, C2, C3, ...)

HARNESS AND WIRE SYMBOLS

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UENR3879November 2012

444F Backhoe Loader

Hydraulic System

LJJ1-UP

FBN1-UP

Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved

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COMPONENT TABLE

Description Part NumberMachine

Location

Schematic

Location

IMPLEMENT PUMP GP 307-3069 1 B-4

HYDRAULIC TANK 358-9301 2 A-5

TANK GROUP 351-5888 3 A-5

HYDRAULIC COOLER 337-9751 4 B-4

HYDRAULIC FILTER 359-7232 5 B-3

HMU 341-7654 6 C-6

STEER CYL-FRONT 217-5097 7 B-6

LH: 374-8060

RH: 374-8059

TILT CYL (PL/IT) 370-7083 9 B-8

MP BUCKET CYL (OPT) 185-1839 10 A-8

F-6

F-3

BOOM CYL 320-6522 12 F-6

STICK CYL 320-6523 13 F-4

LH: 381-8055

RH: 381-8054BUCKET CYL 320-5937 15 F-4

E-STICK CYL (OPT) 320-5935 16 F-3

ACCUMULATOR (PILOT) 226-0420 17 C-5

RIDE CNTRL VALVE (OPT) 245-8780 18 C-8

RIDE CNTRL ACC (OPT) 382-8033 19 C-8

RIDE CNTRL SENSOR (OPT) 344-7391 20 C-8

TEMP SENSOR (OPT) 264-4297 21 C-4

DIFF PRES SWITCH (OPT) 134-0404 22 C-4

COUPLER VALVE (LDR) 359-7228 23 A-8

COUPLER CYL (LDR) 178-3713 24 A-8

LOADER VALVE (PL/IT) 359-7211 25 C-7

BACKHOE VALVE 359-7216 26 F-7

PATTERN CHANGING VALVE 300-4491 27 D-6

SWING CUSHION VALVE 320-7812 28 F-5

F-3

F-6

F-2

F-8

VALVE GP-PILOT (LDR) 382-4996 31 D-7

STD: 359-7246

W/SWITCH 359-7247

DTNT and SWITCH: 359-7248

PILOT MANIFOLD (BASIC +4) 359-7224 33 D-4

PUMP DISCHARGE PRES SNSR 344-7391 34 C-5

BOOSTED BRAKE VALVE 220-8226 35 D-3

ALL WHEEL STEER VALVE (NOT SHOWN) 373-6998 36 A-6

HOSE BURST CHECK VALVE (BOOM) 347-1128 37 F-6HOSE BURST CHECK VALVE (STICK) 347-1129 38 F-4

HOSE BURST CHECK VALVE (LIFT) 262-7081 39 B-8

HOSE BURST CHECK VALVE (TILT) 262-7079 40 B-8

POWERED SIDESHIFT VALVE 351-1637 41 B-2

POWERED SIDESHIFT CYL 347-2223 42 F-1

8TH AUXILIARY VALVE 319-2155 43 E-1

8TH AUXILIARY PILOT VALVE 373-7028 44 D-1

9TH AUXILIARY VALVE 319-2158 45 D-2

9TH AUXILIARY PILOT VALVE 373-7029 46 C-1

COUPLER VALVE (HOE) 358-2091 47 A-3

COUPLER CYLINDER (HOE) 361-1139 48 B-3

VALVE - CHECK 424-2971 49 C-6

COMPONENT LOCATIONS

8 B-8

STABILIZER CYL

SWING CYL 14 F-5

LIFT CYL

VALVE GP-PILOT (STAB) 32 E-8

320-5938 11

VALVE GP-PILOT (HOE) 359-7227 30

308-3437 29STAB CHECK VALVE

= Graphic not avalible at time of publication.(NOT SHOWN)

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TAP TABLE

Tap Number DescriptionSchematic

Location

T1 PUMP DISCHARGE PRESSURE C-5

T2 RIGHT REAR SERVICE BRAKE C-4

T3 REAR PARK BRAKES D-5

TAP LOCATIONS

Pressure, Sampling, Sensor

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LINE PATTERNS

Drain/ ReturnLines

Component Group

Pilot / LoadSensing

PressureLine

Attachment

AirLine

CALLOUTS

Taps (Pressure, Sampling,Se

Components by number

YY

52

444F BACKHOE LOADERHYDRAULICSCHEMATIC

MEDIANUMBER: UENR3879-00

PARTNUMBER: 362-9207, CHANGE: 02, VERSION: --

Components are showninstalledonafully operablemachine.

RefertotheappropriateServiceManualforTroubleshooting, Specifications.

DRAIN/ RETURNLINE

HYDRAULICCIRCUITCOLORDESCR

IMPLEMENTANDSTEERING

SWING CYLINDERCIRCUIT

STEERING CYLINDERCIRC U

PILOTOILCIRC UIT

BUCKETCYLINDER CIRCUIT

STICK CYLINDERCIRC UIT

LOADSENSE CIRCUIT

SUPPLYLINE

BACKHOE VALVE AUX CIRCU

E-STICK CYLINDERCIRCU IT

BOOMCYLINDER CIRCUIT

STABILIZERCYLINDERCIR CU

BOOSTEDBRAKE OILCIRCU

LIFTCYLINDER CIRCUIT

TILTCYLINDERCI RCUIT

LOADERVALVE CIRCUIT

POWERSIDE-SHIFT CYLINDE

SIDE-SHIFTLOCK CYLINDER

COUPLERCIRCUIT (HOE)

12345678

A

B

C

D

E

F

12345678

359-7227320-5935

320-5938

308-3437

320-6523

381-8054381-8055

320-5937

347-1129

320-7812

320-5938

320-6522

308-3437

347-1128

359-7216

359-7227

359-7247359-7248

359-7246

319-2155

347-2223

373-7028

373-7028

373-7029

347-2223

351-1637

359-7232

134-0404

264-4297

307-3069

344-7391

347-2223

358-2091

351-5888

358-9301

214-5079

373-6998

370-7083

185-1839

178-3713

359-7228

262-7079

359-7211

344-7391

382-8033

245-8780

374-8060

262-7081

374-8059

226-0420

341-7654

424-2971

220-8226

359-7224

300-4491

382-4996

337-9751

D

DLS

LIFT

TILT

AUX

FRONT STEERCYL.

ACC

R

T

PS

H

RHSTAB BOOM SWING BUCKET STICK LHSTAB E-STICK

A4 B4B3 A6 B6 A1 B1

LB

LA

TA

TB

LAB

LAA

RS2

RS1

BA

BB R4

R2

SB

SA

LS1

LS2EA

EB

J1

J2 T2 T3 J3

T1

P ACC DIAG

OPERATORLEFT JOYSTICK

OPERATOR

LEFT

OPERATOR

RIGHT

STABILIZERJOYSTICK

TILTLIFT

LOADERJOYSTICK

P

LAAEB

LABEA

TBTALALB

LS2LS1RS2RS1

L1L3L2L4

R2R4R3R1

SBBABB SA

L4R1 R3 L2

A1

B1

A2

B2

A3

B3

A3

BRK

LEFT

BRAKE

PEDAL

TO REARAXLE

LEFT WHEEL

BRAKE

TO REARAXLE

RIGHT WHEEL

BRAKE

S

ULIFT

TILT

AUX

A2 B2 A5 B5 A7 B7

PilBL

C2

V2 PilBL

C2

V2

SIDESHIFT

LOCK

R L

B A

P8

LS8

T8

T7P7

T6

P6

B A

L1

L3

OPERATORRIGHT JOYSTICK

RIGHT

BRAKE

PEDAL

(3)TANK GROUP-FILTER/ BREATHER/ SIGHTGAGE

(2)TANK -HYDRAULIC

(4)COOLER-HYDRAULIC

(1)PUMPGP- IMPLEMENT

(7)CYLINDER-FRONTSTEER

(36)VALVE GP-AWS

(5)FILTER-HYDRAULIC

(22)SWITCH-DIFF PRESS(OPTIONAL)

(21)SENSOR-TEMP(OPTIONAL)

(35)VALVE -BOOSTEDBRAKE

(33)MANIFOLD-PILOT(BASIC+4)

(17)ACCUMULATOR-PILOT

(34)SENSOR-PUMPDISCHARGE

(6)VALVE HMU-LOADSENSE RELIEF

(27)VALVE -PATTERNCHANGE

(31)VALVE GP-PILOT

(25)VALVE -LOADER(PL/IT)

(20)SENSOR-RIDE CONTROL(OP T)

(19)ACCUMULATOR-OPTIONAL

(18)VALVE -RIDE CONTROL(OPT)

(8)CYLINDER-LIFT

(9)CYLINDER-TILT

(10)CYLINDER-MPBUCKET(OPT)

(24)CYLINDER-COUPLER

(23)VALVE -COUPLER(LDR)

(30)VALVE GP-PILOT(HOE)(16)CYLINDER-E STICK(OPT)

(12)CYLINDER-STAB

(29)VALVE -CHECK (STAB)

(13)CYLINDER-STICK(14)CYLINDER-SWINGLH:RH:

(15)CYLINDER-BUCKET

(38)VALVE -STICKHOSE BURST

(28)VALVE -CUSHION

(11)CYLINDER-STAB

(12)CYLINDER-BOOM

(29)VALVE -CHECK (STAB)

(37)VALVE -BOOMHOSE BURST

(26)VALVE -BACKHOE

(40)VALVE -TILTHOSE BURST

(39)VALVE -LIFTHOSE BURST

(30)VALVE GP-PILOT(HOE)

(32)VALVE GP-PILOT(STAB)

W / SWITCH:DTNT andSWITCH:

9THAUX

A2B2

PSS

A1B1

8THAUX

A2B2

T2

LS2

P2

LST M P

8TH AUXILIARY & POWERED SIDESHIFT

P8LS8T8

T6

P6

C2C1

P

TT6

P6

T8

P8

LSC1 C2

P

T

POWEREDSIDESHIFT

LS8

BACKHOE COUPLER

T7

P7

9THAUXILIARY

(44)VALV8THAUX

(45)VALVE -9THAUX

(43)VALVE -8THAUX

(42)CYLINDER-POWERSIDE SHIFT

(46)VALVE -PILOT9THAUX

(42)CYLINDER-POWERSIDE SHIFT

(41)VALVE -POWERSIDE SHIFT

(47)VALVE -COUPLER(HOE)

(48)CYLINDER-COUPLER(HOE)

ADDEDAS AN ADDITONALSLICE TO8THand POWEREDSIDESHIFT VALVE

F1

F2R2

R1

REARSTEERCYLINDER

FRONT STEERCYL.

AWS VALVE

HMU-RHMU-L

OPTIONALAT TACHMENT

OPTIONALATTA CHMENT(49)VALVE -CHECK

LH:RH:

OPTIONALAT TACHMENT

STD:

OPTIONALATTA CHMENT

(33)MANIFOLD-PILOT(BASIC+4)

T2

T1

T3

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RIGHT SIDE VIEW

T1 494645

4443

41

3433 32

3130

29

26

25

11

9

8

6

4321

VIEW ALL C

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LEFT SIDE VIEW

4

4039 35

1918

10

5

VIEW ALL C

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UNDERSIDE VIEW

T3 T2

48

4728

27 24

2322

21 2017 7

VIEW ALL C

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BOOM VIEW

38

37

16

15

13

12

VIEW ALL CALLO

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