SistHidraul.420F

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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E-C60 E-C61

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VIEW ALL CALLOUTS

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ELECTRICAL SYMBOLS

HOTKEYS (Keyboard Shortcuts)

BASIC HYDRAULIC COMPONENT SYMBOLS

T

FUNCTION Zoom In Zoom Out Fit to Page Hand Tool Find

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

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

Unidirectional

CONTROL AB

AB

P T

P T

Single Acting

Spring Loaded

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

MOTORS

Double Acting

Infinite Position

CHECK

Basic Symbol

Variability

FIXED DISPLACEMENT

Shifted Position

Normal Position

Pump or Motor

Bidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

CYLINDERS

Four-Way

BASIC HYDRAULIC COMPONENT SYMBOLS

FIXED DISPLACEMENT

CROSS FLOW

ACCUMULATORS

Shuttle

Unidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

Pilot Controlled

Spring Loaded Gas Charged

Unidirectional

PILOT CONTROL

Bidirectional

ROTATING SHAFTS

RELEASED PRESSURE

External Return

Bidirectional

Unidirectional

Internal Return

Bidirectional

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

Transducer (Fluid)

Transducer (Gas / Air)

M

Generator

Electric Motor

Flow

Return Above Fluid Level

Return Below Fluid Level

ELECTRICAL SYMBOLS

HYDRAULIC SYMBOLS - ELECTRICAL G

Temperature

Pressure

FLUID STORAGE RESERVOIRS

MANUAL CONTROL

Push-pull Lever

MAIN AUX.

T

Pressure Switch

Pressure Switch (Adjustable)

Temperature Switch

Electrical Wire

Pressure Switch

Temperature Switch

BASIC ELECTRICAL COMPONENT SYMBOLS

Level Switch

Flow 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.

AG-C4 111-7898 Part Number: for Connector Plug

1

L-C12 3E-5179

2

Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine.

Receptacle Pin or Socket Number

Plug

Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.

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, ...)

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. 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.

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

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

9X-1123

Component Part Number

325-AG135 PK-14 Wire Gauge Wire Color

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.

UENR3236 April 2012

420F and 430F Backhoe Loader Hydraulic System 420F: LTG1-UP SKR1-UP

430F: LDY1-UP

© 2012 Caterpillar, All Rights Reserved

Printed in U.S.A.

COMPONENT LOCATION COMPONENT LOCATIONS

Pump GP - Implement

Part Number 307-3069

Machine Location 1

Schematic Location B-4

Tank - Hydraulic

358-9301

2

A-5

Tank Group - Filter / Breather / Sight Gage

351-5888

3

A-5

Cooler - Hydraulic

337-9751

4

B-4

Description

Filter - Hydraulic

359-7232

5

B-3

Valve HMU - Load Sense Relief

341-7654

6

C-6

214-5097

7

B-6

8

B-8

Cylinder - Front Steer Cylinder - LIFT

LH:

358-5034

RH:

358-5035

Cylinder - Tilt

358-5044

9

B-8

Cylinder - MP Bucket (OPT)

185-1839

11

A-8

Cylinder - Stab Cylinder - Boom Cylinder - Stick Cylinder - Swing Cylinder - Bucket

LH:

291-2681

RH:

291-2682

420F:

210-7076

430F:

246-9884

420F:

210-7082

430F:

210-7092

LH:

381-8055

RH:

381-8054

420F:

210-7088

430F:

210-7096

12

F-6 F-3

13

F-5

14

F-4

15

F-5

16

F-4

Cylinder - E-Stick

210-7098

17

F-3

Accumulator - Pilot

226-0420

18*

C-5

Valve - Ride Control (OPT)

245-8780

19

C-8

Accumulator (OPT)

382-8033

20

C-8

Sensor - Ride Control (OPT)

344-7391

21

C-8

Sensor - Temp (OPT)

264-4297

22

C-3

Switch - Diff Temp (OPT)

134-0404

23*

C-3

Valve - Loader (PL/IT)

359-7211

27

C-7

28

F-6 D-6

Valve - Backhoe

6 Bank:

359-7208

7 Bank:

359-7210

8 Bank:

359-7212

Valve - Pattern Change

300-4491

29

Valve - Cushion

206-3685

30

F-5

Valve - Check (Stab)

359-7213

31

F-3, F-6

359-7227

32

F-8, F-1

34*

E-8

Valve GP - Pilot (HOE) Valve GP - Pilot (STAB)

STD:

359-7246

W/SWITCH:

359-7247

DTNT and SWITCH:

359-7248

Manifold - Pilot (BASIC +4)

359-7224

35

D-4

Sensor - Pump Discharge

344-7391

36

C-5

Valve - Boosted Brake

220-8226

37

D-3

Valve - Coupler (HOE)

358-2091

50*

A-3

Cylinder - Coupler (HOE)

361-1139

51*

B-3

* COMPONENTS NOT SHOWN

TAP LOCATION

TAP LOCATIONS Pressure, Sampling, Sensor Tap Number

Description

Schematic Location C-5

T1

PUMP DISCHARGE PRESSURE

T2

RIGHT REAR SERVICE BRAKE

C-4

T3

REAR PARK BRAKES

D-5

8

7

6

5

(12) CYLINDER - STAB 291-2681

(32) VALVE GP - PILOT (HOE) 359-7227

4

(13) CYLINDER - BOOM 420F: 210-7076 430F: 246-9884

2

(14) CYLINDER - STICK 420F: 210-7082 430F: 210-7092

OPERATOR RIGHT JOYSTICK (32) VALVE GP - PILOT (HOE) 359-7227

(31) VALVE - CHECK (STAB) 359-7213

(30) VALVE - CUSHION 206-3685

(31) VALVE CHECK (STAB) 359-7213

1

(12) CYLINDER - STAB 291-2682

(16) CYLINDER - BUCKET 420F: 210-7082 430F: 210-7092

(15) CYLINDER - SWING LH: 381-8055 RH: 381-8054

OPERATOR LEFT JOYSTICK

3

(17) CYLINDER - E STICK (OPT) 210-7098

F L3 RS2 (28) VALVE - BACKHOE 6 BANK: 359-7208 7 BANK: 359-7210 8 BANK: 359-7212

L4

L2

L3

SA

BA

A1

LS2

R2

A2

B1

F

B2

A3

A5

B4

A4

B3

B5

EA

A6

A7

B6

R1

HAA

B7

A8

R3

R4

R2

B8

L1

(34) VALVE GP - PILOT (STAB) STD: 359-7246 W / SWITCH: 359-7247 DTNT and SWITCH: 359-7248

STABILIZER JOYSTICK OPERATOR LEFT

OPERATOR RIGHT

E

E

BOOM

RH STAB RS1

RS2

LS2

LS1

RS1

BUCKET

SWING

BB

LH STAB

STICK

R4

EB

LS1

L1

AUX

E-STICK

HAB

SB

T6

EB BB

SA

BA

SB

J2

P6

(29) VALVE - PATTERN CHANGE 300-4491

T2

T3

LAA (37) VALVE - BOOSTED BRAKE 220-8226

J3 LEFT BRAKE PEDAL

J1

TO REAR AXLE LEFT WHEEL BRAKE

D R1

L4

R3

D

L2 T1 TO REAR AXLE RIGHT WHEEL BRAKE

RIGHT BRAKE PEDAL

P

(27) VALVE - LOADER (PL/IT) 359-7211

ACC

BRK

DIAG

T3

(18) ACCUMULATOR - PILOT 226-0420

EA

LAB

(35) MANIFOLD - PILOT (BASIC +4) 359-7224

(20) ACCUMULATOR - OPTIONAL 382-8033

(19) VALVE - RIDE CONTROL (OPT) 245-8780

C

DLS

P

C

(21) SENSOR RIDE CONTROL (OPT) 344-7391

T2

ACC

PS

T1

(6) VALVE HMU - LOAD SENSE RELIEF 341-7654 T

(22) SENSOR - TEMP (OPTIONAL) 264-4297

D R

(36) SENSOR PUMP DISCHARGE 344-7391

H

LIFT

(8) CYLINDER - LIFT LH: 358-5034 RH: 358-5035

LIFT

(23) SWITCH - DIFF PRESS (OPTIONAL) 134-0404

T7

P7

LINE PATTERNS Pressure Line

(4) COOLER - HYDRAULIC 337-9751

B1

Pilot / Load Sensing Pressure

U

Drain / Return Lines

S

A1

Component Group

(5) FILTER - HYDRAULIC 359-7232

B

CALLOUTS YY

Callout Number

(Machine Location from Component LocationsTable)

TILT

(9) CYLINDER - TILT 358-5044

FRONT STEER CYL.

PILOT PUMP OUTPUT MAIN PUMP OUTPUT LIFT CYLINDER CIRCUIT BUCKET CYLINDER CIRCUIT LOAD SENSE CIRCUIT STEERING CIRCUIT STICK CYLINDER CIRCUIT SUPPLY LINE AUX CIRCUIT BOOM CYLINDER CIRCUIT TILT CYLINDER CIRCUIT LOADER VALVE CIRCUIT DRAIN / RETURN LINE STABILIZER CYLINDER CIRCUIT SWING CYLINDER CIRCUIT E-STICK CYLINDER CIRCUIT COUPLER CIRCUIT (HOE)

(7) CYLINDER - FRONT STEER 214-5079

(50) VALVE - COUPLER (HOE) 358-2091 (11) CYLINDER MP BUCKET (OPT) 185-1839

Component Name

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

(51) CYLINDER COUPLER (HOE) 347-2223

B2 A2

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

B

(1) PUMP GP - IMPLEMENT 307-3069

L

R

Taps (Pressure, Sampling, Sensor - by letter)

AUX

BOOSTED BRAKE OIL CIRCUIT

A

A

B3 AUX

(2) TANK - HYDRAULIC 358-9301

A3

T7

P7

BACKHOE COUPLER

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.

(3) TANK GROUP - FILTER / BREATHER / SIGHT GAGE 351-5888

8

7

6

5

THIS SCHEMATIC IS FOR THE 420F AND 430F BACKHOE LOADER HYDRAULIC SYSTEM MEDIA NUMBER: UENR3236 SCHEMATIC PART NUMBER: 362-9207, CHANGE: 01, VERSION: -

4

3

2

1

FRONT VIEW VIEW ALL CALLOUTS

8

9

4

20

REAR MACHINE VIEW VIEW ALL CALLOUTS

11 16

14 32 13

15

12

BOOM VIEW - WITH E-STICK VIEW ALL CALLOUTS

17

UNDER CAB VIEW VIEW ALL CALLOUTS

3 2

7

37 T1

1 22 5

6 T2

36 27 30 28 21 19

REAR FRAME VIEW VIEW ALL CALLOUTS

35 29 31

T3