Retro 420D PDF

February 28, 2024 | Author: Anonymous | Category: N/A
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RENR7783-02 August 2010

FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN

Component Locations (Volume 1)

149-0686

1

G-6

Cartridge - P.O. Check

213-4072

2

C-3 , C-7

Connector - Orifice (Loader Valve)

220-8219

3

E-9

Connector - Orifice ( Left Hand Joystick)

164-9639

4

B-7

Connector - Orifice (Switching Valve)

220-8219

5

A-6 B-15

Cooler - Radiator

235-1974

6

Cover - End

191-4010

7

I-9

Cover - End (Backhoe Valve)

6E-4158

8

C-1

Cover Gp - Inlet

211-0180

9

C-9

Cylinder - Boom

206-3630

10

D-8

Cylinder - Bucket

191-7835

11

D-4

Cylinder - Lift (ST)

230-0980

12

G-11

Cylinder - Stabilizer (Left)

228-3499

13

H-4

Cylinder - Stabilizer (Right)

228-3500

14

H-2

Cylinder - Steer

167-4325

15

E-13 D-3

Cylinder - Stick

235-9829

16

Cylinder - Swing

228-3506

17

D-6

Cylinder - Tilt (ST)

200-7128

18

H-11

Filter

210-6243

19

G-13

Hand Metering Unit (HMU)

238-8550

20

D-14

Manifold - Return

186-3629

21

F-7

Pump Gp

244-2228

22

B-13

Tank Gp - Hydraulic

240-9721

23

B-14

Valve - Backhoe

201-0665

25

C-1

Valve - Boom

201-0668

26

C-7

Valve - Bucket

201-5358

27

C-4

Valve - Check

214-3524

28

C-10

Valve - Lift

130-6520

29

F-10

Valve - Line Relief (Boom)

187-0523

30

C-8 C-8

Valve - Line Relief (Boom)

6E-6285

31

Valve - Line Relief (Bucket)

187-0524

32

C-5

Valve - Line Relief (Bucket)

187-0527

33

C-5

Valve - Line Relief (Stick)

187-0529

34

C-3

Valve - Line Relief (Stick)

187-0528

35

C-3

Valve - Line Relief (Swing)

137-9466

36

C-6

Valve - Line Relief (Tilt)

6E-6285

37

H-9

Valve - Line Relief (Tilt)

204-4313

38

H-9

Valve - Stabilizer

192-0827

39

G-1, G-5

Valve - Steer Priority

188-7471

40

E-10

Valve - Stick

201-0669

41

C-3

Valve - Swing

201-5357

42

C-6

Valve - Tilt

201-5377

43

G-10

Valve - Tilt Down Pressure Limiter

210-6171

44

G-10

Valve Gp - 2 Bank Loader

200-7827

45

E-9

Valve Gp - Cushion Relief

206-3685

46

D-5

Valve Gp - P.C.F.R.

212-0732

47

C-9

Valve Gp - Pilot / Left Hand Joystick

185-5916

48

A-8

Valve Gp - Pilot / Right Hand Joystick

185-5915

49

A-3

Valve Gp - Pilot Shut Off

233-7132

50

F-7

Valve Gp - P-Lever 2 Bank/Detents/SW

185-5900

51

G-7

Valve Gp - Pressure Reducing

239-2226

52

F-6

Valve Gp - Stabilizer (2 Bank RE-Relief)

185-5898

53

G-1

Switch - Differential Pressure

134-0404

54

G-13

16

2A 11

20

23

191-7725

1A

C-2

Cylinder - E-Stick Bucket

191-7839

2A

D-4

Cylinder - MP Bucket

185-1839

3A

I-13

Valve - Auxiliary (Backhoe Valve)

190-3450

4A

C-8

Valve - Auxiliary (Loader Valve)

124-8818

5A

H-10

Valve - Backhoe (5 Bank)

201-0666

7A

C-1

Valve - Backhoe (6 Bank)

201-0667

9A

C-1

Valve - E-Stick

201-0664

10A

C-1

Valve - Line Relief (Aux Loader Valve)

9T-0704

11A

I-9

Valve - Line Relief (E-Stick)

132-5303

12A

C-2

Valve - Pressure Controller (E-Stick)

211-3539

13A

C-2

Valve - Switching

164-2274

14A

A-6

200-7828

15A

E-9

162-3960

1B

D-12

Switch - Pressure

131-9203

2B

C-11

Valve Gp - Ride Control

243-2266

3B

D-12

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

LINE RESTRICTION (FIXED)

1A

BB

Pump Signal Pressure Test Port

B-12

Pilot Pressure Test Port

G-6

420D Backhoe Loader (BMC)

SEBP3584

432D Backhoe Loader (WEP & TDR)

SEBP3971

442D Backhoe Loader (TBD & SMJ)

SEBP3967

THREE - WAY

FOUR - WAY

P T BASIC SYMBOL

INFINITE POSITION

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

420D, 432D and 442D Backhoe Loader Hydraulic System 420D: BKC1-UP BMC1-UP

PRESSURIZED

432D: WEP1-UP TDR1-UP

RETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

MEASUREMENT

PRESSURE

ROTATING SHAFTS

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

442D: TBD1-UP SMJ1-UP

SOLENOID

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID & PILOT OR MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

10 PUSH - PULL LEVER

GENERAL MANUAL

MANUAL SHUTOFF

2 4A 5 7A 8

17

EXTERNAL RETURN

9 9A 10A 12A 13A

14A

25 26 27 28 30 14 39

13

31 32 33 34 35

1B 2B 3B

4 49

51

1

INTERNAL RETURN

PEDAL

SPRING

REMOTE SUPPLY PRESSURE

SIMPLIFIED

COMPLETE

CROSSING & JOINING LINES

ACCUMULATORS

INTERNAL SUPPLY PRESSURE

HYDRAULIC & PNEUMATIC CYLINDERS

48 19 22 54

15

12 44

3A SPRING LOADED

52 53

36 41 42 46 47

PUSH BUTTON

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

21 50

3 5A 7

GAS CHARGED

LINES CROSSING

SINGLE ACTING

LINES JOINING

HYDRAULIC MOTORS

HYDRAULIC PUMPS

DOUBLE ACTING

INTERNAL PASSAGEWAYS

11A 15A FIXED DISPLACEMENT

29 37 38 40 43 45

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

Volume 1 of 2: Single Tilt Loader With Center Pivot Backhoe

INFINITE POSITIONING

3 POSITION

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

RENR7778

Testing and Adjusting: (Hydraulic & Steering System)

RENR7779

Specifications: (Axles, Differentials & Brakes)

RENR7776

Testing and Adjusting: (Axles, Differentials & Brakes)

RENR7777

ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)

19 43

5A

47

G

29 40 22

22. 19. 45. BB.

M

TRANSDUCER (FLUID)

TRANSDUCER (GAS / AIR)

GENERATOR

ELECTRIC MOTOR

PRESSURE SWITCH

PRESSURE SWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

50

ELECTRICAL SYMBOLS (ELECTRICAL)

Hydraulic Pump Filter Loader Valve Group Signal Pressure Test Port

AA

22

The Pilot Shutoff Valve (50) is mounted to the front of the rear axle. The optional Pattern Changeover Valve (47) for the Backhoe Valve Group is mounted on the right side of the rear frame. The valve allows the operator to change from the excavator pattern to the backhoe pattern. Also shown is the Pilot Return Manifold (21).

The Loader Valve Group (45) consists of an inlet manifold with a Steering Priority Valve (40), a loader Lift Control Valve (29), a Tilt Control Valve (43), and an optional Auxiliary Valve (5A).

T

PRESSURE SWITCH

TEMPERATURE SWITCH

LEVEL SWITCH

FLOW SWITCH

WIRE NUMBER IDENTIFICATION CODES

ELECTRICAL SCHEMATIC EXAMPLE

HYDRAULIC SCHEMATIC EXAMPLE

CURRENT STANDARD

CURRENT STANDARD

HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG”

LOADER VALVE GROUP

PILOT SHUT OFF VALVE

WIRE CIRCUIT NUMBER IDENTIFICATION

325-AG135 PK-14

Electrical System

WIRE COLOR

RENR7781

Schematic: (Electrical system)

FLOW IN EITHER DIRECTION

Printed in U.S.A.

Machine System Specifications: (Hydraulic & Steering System)

2 POSITION

MACHINE COMPONENT LOCATIONS

Media Number SEBP3583

TWO - WAY

CHECK VALVES

SHIFTED POSITION

VENTED

Related Manuals

420D Backhoe Loader (BKC)

VALVE PORTS

THREE POSITION

6

Schematic Location

CC

ATTACHMENT

A B

P T

Tap Locations (Volume 1) Pressure, Sampling, and Sensor

A-12

PUMP (VARIABLE & PRESSURE COMPENSATED)

LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)

VALVES

TWO POSITION

NORMAL POSITION

45

Pump Pressure Test Port

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

PUMP (2 - SECTION)

18

BB

Description Parts Manual

SPRING (ADJUSTABLE)

RESTRICTION

CONTROL VALVES

21

Accumulator - Ride Control

AA

VARIABILITY

AB

Ride Control

Description

CONTROL VALVES

ONE POSITION

© 2010 Caterpillar, All Rights Reserved

Cylinder - E-Stick

Tap Number

SPRING

VALVE ENVELOPES

Attachments

Valve Gp - 3 Bank Loader

FLUID CONDITIONER

CIRCUIT NUMBER IDENTIFICATION

WIRE COLOR

WIRE GAUGE

325-PK

PREVIOUS STANDARD WIRE COLOR

WIRE

22. Hydraulic Pump AA. Pump Pressure Test Port

B

325-PK-14

Sight Gauge

HYDRAULIC PUMP

CIRCUIT NUMBER IDENTIFICATION

25 10A

WIRE GAUGE

(EXAMPLE VALVE)

23 26

Ride Control Pressure Switch F738-WH 200-BK

Drain Tube

CC

52

42

2B

41

1

1B 27 3B

1B

Ride Control Solenoid 976-OR 200-BK The Ride Control Valve (3B) is located on the inside of the right frame rail below the cab. 1B. Accumulator 2B. Pressure Switch 3B. Ride Control Valve

RIDE CONTROL

A

The pilot operated Backhoe Valve Group (25) is located at the rear of the machine. Outlet ports to the cylinders face the rear of the machine on all models. 25. Backhoe Valve Group 26. Boom Valve 42. Swing Valve 27. Bucket Valve 41. Stick Valve 10A. E-Stick Valve

BACKHOE VALVE GROUP

The Hydraulic Tank (23) is located between the engine and the cab. The sight gauge is located on the side of the tank.

1. Pilot Accumulator 52. Pressure Reducing Valve (Stabilizer) CC. Pilot Oil Pressure Test Port

HYDRAULIC TANK

PRESSURE REDUCING VALVE

(Dimensions: 39 inches x 28 inches)

Accumulator - Pilot Pressure

Description

PUMP OR MOTOR

Schematic Location

30 Page,

Machine Location

RENR7783-02 VOL 1 of 2

Part Number

AUX

15

14

13

12

11

10

9

8

7

6

5

4

3

Main Pump Output. Load Sense Circuit. Pilot Shutoff Control Circuit. Supply Line. Drain / Return Line. Hand Metering Unit Control Circuit. Lift Cylinder Control Circuit. Auxiliary Control Circuit. Tilt Cylinder Control Circuit. Bucket Cylinder Control Circuit. Boom Cylinder Control Circuit. Swing Cylinder Control Circuit. Bucket / E-Stick Control Circuit. Stick Cylinder Control Circuit. Stabilizer Cylinder Control Circuit. Stabilizer Cylinder Control Circuit. E-Stick Cylinder Control Circuit.

Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines

I

Component Group

VALVE LINE RELIEF 9T-0704

Attachment Air Line

AUX

VALVE AUXILIARY 124-8818

VALVE GP - PILOT 2 BANK STABILIZER 185-5900

VALVE LINE RELIEF 6E-6285

H

VALVE LINE RELIEF 204-4313

CYLINDER STABILIZER 228-3500

CYLINDER TILT 200-7128

CYLINDER STABILIZER 228-3499

VALVE TILT 201-5377 CYLINDER LIFT 230-0980

FILTER GP 210-6243

G

1

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

LINE PATTERNS

END COVER 191-4010

CYLINDER MP BUCKET 185-1839

2

TILT

I

H VALVE GP STABILIZER 2 BANK 185-5898

ACCUMULATOR 149-0686

VALVE TILT DOWN PRESS LIMITER 210-6171

G

CC DOWN

DOWN

UP

PILOT PRESSURE

UP

PRESSURE SWITCH 134-0404

LIFT RETURN MANIFOLD 186-3629

T1

VALVE LIFT 130-6520 T3

VALVE GP PRESSURE REDUCING 239-2226

T4

F

F

P1

VALVE GP PILOT SHUT OFF 233-7132

USED WITH PL LOADER CYLINDER STEER 167-4235

S2

VALVE STEER PRIORITY 188-7471

CONNECTOR ORIFICE 220-8219

E

USED WITH AWS

STABILIZER (LEFT)

STABILIZER (RIGHT)

VALVE GP (ATTCH) 3 BANK LOADER 200-7828

(Dimensions: 39 inches x 28 inches)

E

VALVE STABILIZER 192-0827

S3

30 Page,

RENR7783-02 VOL 1 of 2

USED WITH NON-AWS

VALVE GP 2 BANK LOADER 200-7827

VALVE GP RIDE CONTROL 243-2266

ACCUMULATOR 162-3960

CYLINDER SWING 228-3506

S

HMU 238-8550

VALVE GP CUSHION RELIEF 206-3685 H

ACC

D VALVE P.C.F.R. 212-0732 T

R

CYLINDER BUCKET 191-7835

D

CYLINDER STICK 235-9829

CYLINDER BOOM 206-3630

COVER GP INLET 211-0180

CYLINDER (ATTCH) E-STICK BUCKET 191-7839

CARTRIDGE P.O. CHECK 213-4072

VALVE LINE RELIEF 6E-6285

VALVE LINE RELIEF 137-9466

CYLINDER E-STICK 191-7725

VALVE LINE RELIEF 187-0528

VALVE LINE RELIEF 187-0524

VALVE LINE RELIEF 132-5303

PS

VALVE E-STICK 201-0664

END COVER 6E-4158

S1

HMU

VALVE CHECK 214-3524

SWITCH PRESSURE RIDE CONTROL 131-9203

C

C

P

AUX

PUMP GP 244-2228 SIGNAL PRESSURE

COOLER RADIATOR 235-1974

VALVE LINE RELIEF 187-0523

VALVE AUXILIARY 190-3450

BB T

SWING

BOOM VALVE LINE RELIEF 137-9466

VALVE BOOM 201-0668

BUCKET

VALVE SWING 201-5357

VALVE LINE RELIEF 187-0529

VALVE BUCKET 201-5358

TANK GP HYDRAULIC 240-9721

E-STICK

STICK VALVE STICK 201-0669

CARTRIDGE P.O. CHECK 213-4072

VALVE PRESSURE CONTROLLER 211-3539

VALVE BACKHOE 201-0665

VALVE LINE RELIEF 187-0527 VALVE BACKHOE 5 BANK 201-0666

B CONNECTOR ORIFICE 164-9639

B

VALVE BACKHOE 6 BANK 201-0667

VALVE GP - PILOT RIGHT HAND JOYSTICK 185-5915

AA PUMP PRESSURE

CONNECTOR ORIFICE 220-8219

PUMP VALVE GP - PILOT LEFT HAND JOYSTICK 185-5916

A

BOOM DOWN

BOOM UP

LEFT

A

VALVE SWITCHING 164-2274

RIGHT

DUMP

CURL

STICK OUT

STICK IN

420D, 432D AND 442D BACKHOE LOADER VOLUME 1 of 2: SINGLE TILT LOADER W/ CENTER PIVOT BACKHOE RENR7783-02 PART NUMBER: 201-6839, CHANGE: 06, 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.

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

RENR7783-02 August 2010

Component Locations (Volume 2) Machine Location

Schematic Location

149-0686

1

H-6

Connector - Orifice (Loader Valve)

220-8219

2

Connector - Orifice ( Loader Joystick)

164-9639

3

Cover Gp - Pressure Reducing Valve

239-2226

4

G-5 C-15

Cooler - Radiator

235-1974

5

105-4910

6

I-10

Cover - End (Backhoe Valve)

193-9189

7

D-1

Cover Gp - Inlet

211-0180

8

D-8

Cylinder - Boom

206-3630

9

E-7

Cylinder - Bucket

191-7835

10

E-4

Cylinder - Lift (IT) (420D) Cylinder - Lift (IT) (432D & 442D)

228-3505 192-3791

11

F-12

Cylinder - Stabilizer

173-4565

12

I-2, I-4

Cylinder - Steer

167-4235

13

H-12

Cylinder - Stick

235-9831

14

E-3

Cylinder - Swing

228-3507

15

E-6

Cylinder - Swing

228-3506

16

E-6

Cylinder - Tilt (IT)

192-3884

17

G-12

Filter

210-6243

18

D-15

Hand Metering Unit (HMU)

238-8550

19

F-14

Manifold - Return

186-3629

20

H-7

Pump Gp (420D) Pump Gp (432D & 442D)

244-2228 235-4109

21

B-13

Tank Gp - Hydraulic

240-9721

22

B-14

Switch - Differential Pressure

134-0404

23

D-15

Valve - Backhoe (4 Bank)

230-1459

24

D-1

Valve - Boom

191-4480

25

D-7

Valve - Bucket

191-4484

26

D-4

Valve - Check

214-3524

27

E-9

Valve - Lift

194-6757

28

F-11

Valve - Line Relief (Boom)

187-0523

29

D-7

Valve - Line Relief (Boom)

6E-6285

30

D-7

Valve - Line Relief (Bucket)

187-0524

31

D-4

Valve - Line Relief (Bucket)

187-0527

32

D-4

46

22

MAIN

420D, 432D and 442D Backhoe Loader Hydraulic System

9

7

D-6

29 30 31 32 33

Valve - Line Relief (Tilt)

187-0532

36

G-11

34 35 40 41 44

Valve - Line Relief (Tilt)

197-3124

37

G-10

Valve - Stabilizer

222-0364

38

H-2, H-4

Valve - Steer Priority

200-6378

39

E-11

Valve - Stick

191-4485

40

D-3

Valve - Swing

191-4483

41

D-6

Valve - Tilt

194-6758

42

G-11

185-5916

45

B-5

187-0521

46

A-10

Valve Gp - Pilot / Right Hand Joystick

185-5915

47

B-2

Valve Gp - Pilot Shut Off

233-7132

48

G-6

Valve Gp - Side Shift Clamp

3E-8622

49

D-1

Valve Gp - Stabilizer (2 Bank RE-Relief) 185-5898 Attachments

50

I-1

Cover Gp - Used W/ Aux Loader Valve

194-6763

1A

I-10

Cylinder - AWD Steer (Front)

214-5097

2A

H-12

Cylinder - Coupler

178-3713

3A

H-12

Cylinder - E-Stick

191-7725

4A

E-2

Cylinder - E-Stick Bucket

191-7839

5A

E-4

Cylinder - MP Bucket

185-1839

6A

H-12

----

7A

I-12

Valve - Auxiliary (Loader Valve)

194-6760

8A

H-10

Valve - Backhoe (5 Bank)

230-1460

10A

D-1

Valve - Backhoe (6 Bank)

230-1461

11A

D-1

Valve - Coupler

138-1979

12A

H-11

190-3450

13A

9T-0704

14A

Valve - Switching

164-2274

15A

B-3

Valve Gp - 3 Bank Loader

179-8290

16A

E-10

Valve Gp - Cushion Relief

206-3685

17A

E-5

201-0947 All Wheel Steer

18A

H-11

17A 24

25 26 27 12

1

4

38

15A

11 23

1C 2C 3C

45 47

ATTACHMENT

VALVE PORTS

THREE POSITION

TWO - WAY

THREE - WAY

FOUR - WAY

CHECK VALVES

A B

P T SHIFTED POSITION

BASIC SYMBOL

INFINITE POSITION

PRESSURIZED

SPRING LOADED

2A 13

432D: WEP1-UP TDR1-UP

SHUTTLE

PILOT CONTROLLED

49 75 74 73 72

PRESSURE

ROTATING SHAFTS

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

442D: TBD1-UP SMJ1-UP

SOLENOID

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID & PILOT OR MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

PUSH - PULL LEVER

GENERAL MANUAL

MANUAL SHUTOFF

PUSH BUTTON

PEDAL

PILOT CONTROL SYMBOLS

SPRING

REMOTE SUPPLY PRESSURE

18 21 23

77 20 48 2B

15 16

RETURN BELOW FLUID LEVEL

MEASUREMENT

3A 7A 12A 18A

6A

RETURN ABOVE FLUID LEVEL

RELEASED PRESSURE

50 1B 3B 4B 5B

2

EXTERNAL RETURN

6

16A 28

INTERNAL RETURN

SIMPLIFIED

COMPLETE

CROSSING & JOINING LINES

ACCUMULATORS

8A 14A

INTERNAL SUPPLY PRESSURE

HYDRAULIC & PNEUMATIC CYLINDERS

36

37 42 43

SPRING LOADED

GAS CHARGED

LINES CROSSING

FIXED DISPLACEMENT

MACHINE COMPONENT LOCATIONS

20

© 2010 Caterpillar, All Rights Reserved

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLE ACTING

INTERNAL PASSAGEWAYS

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

Volume 2 of 2: Parallel Lift Loader With Center Pivot Or Side Shift Backhoe

SINGLE ACTING

LINES JOINING

HYDRAULIC MOTORS

HYDRAULIC PUMPS

INFINITE POSITIONING

3 POSITION

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

110-0873

1B

I-14

128-5091

2B

E-14

Valve Gp - All Wheel Steer Valve - Shuttle Orifice - Check

121-4449 8J-6875 255-7117

3B 4B 5B

G-14 G-14 H-14

Accumulator - Ride Control

162-3960

1C

F-13

Switch - Pressure

131-9203

2C

E-12

Valve Gp - Ride Control

252-0634

3C

F-13

48 43

42

8A

BB

ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)

21

28 39

21. 18. 43. BB.

G

The Pilot Shutoff Valve (48) is mounted to the front of the rear axle. The optional Pattern Changeover Valve (44) for the Backhoe Valve Group is mounted on the right side of the rear frame. The valve allows the operator to change from the excavator pattern to the backhoe pattern. Also shown is the Pilot Return Manifold (20).

Hydraulic Pump Filter Loader Valve Group Signal Pressure Test Port

Tap Locations (Volume 2) Pressure, Sampling, and Sensor Schematic Location

Pump Pressure Test Port

A-12

BB

Pump Signal Pressure Test Port

B-12

CC

Pilot Pressure Test Port

H-5

AA

TRANSDUCER (GAS / AIR)

GENERATOR

ELECTRIC MOTOR

PRESSURE SWITCH

PRESSURE SWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

ELECTRICAL SYMBOLS (ELECTRICAL)

LOADER VALVE GROUP

Coupler Solenoid 163-WH 779-WH

21

M

TRANSDUCER (FLUID)

The Loader Valve Group (43) consists of an inlet manifold with a Steering Priority Valve (39), a loader Lift Control Valve (28), a Tilt Control Valve (42), and an optional Auxiliary Valve (8A).

PILOT SHUT OFF VALVE

AA

T

PRESSURE SWITCH

TEMPERATURE SWITCH

LEVEL SWITCH

FLOW SWITCH

12A

12A

WIRE NUMBER IDENTIFICATION CODES

Related Manuals

ELECTRICAL SCHEMATIC EXAMPLE

HYDRAULIC SCHEMATIC EXAMPLE

CURRENT STANDARD

CURRENT STANDARD

Media Number HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG”

420D Backhoe Loader (BKC)

SEBP3583

420D Backhoe Loader (BMC)

SEBP3584

432D Backhoe Loader (WEP & TDR)

SEBP3971

442D Backhoe Loader (TBD & SMJ)

SEBP3967

WIRE

3A

Specifications: (Hydraulic & Steering System)

RENR7778

Testing and Adjusting: (Hydraulic & Steering System)

RENR7779

Specifications: (Axles, Differentials & Brakes)

RENR7776

Testing and Adjusting: (Axles, Differentials & Brakes)

RENR7777

21. Hydraulic Pump AA. Pump Pressure Test Port

FRONT VIEW

2B

CIRCUIT NUMBER IDENTIFICATION

WIRE COLOR

WIRE COLOR

WIRE GAUGE

325-PK

PREVIOUS STANDARD

LEFT SIDE VIEW 3A. Coupler Cylinder 12A. Coupler Valve

Electrical System

CIRCUIT NUMBER IDENTIFICATION

325-AG135 PK-14

AWS Pressure Switch G787-BR E764-OR

Machine System

Schematic: (Electrical system)

FLOW IN EITHER DIRECTION

Printed in U.S.A.

Ride Control

Description Parts Manual

2 POSITION

44

18

H-10

Switch - Pressure

Description

LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)

D-2, D-8

Cylinder - Rear Steer

Tap Number

PUMP (VARIABLE & PRESSURE COMPENSATED)

WIRE COLOR

WIRE

RENR7781

B

325-PK-14

A

COUPLER CYLINDER / VALVE

HYDRAULIC PUMP

CIRCUIT NUMBER IDENTIFICATION

2B. All Wheel Steer Pressure Switch

WIRE GAUGE

(EXAMPLE VALVE)

AWS PRESSURE SWITCH

24 13A

Ride Control Pressure Switch F738-WH 200-BK

Sight Gauge

25 22

CC

4

2C

41

1C

1

Drain Tube

40 3C

1C

Ride Control Solenoid 976-OR 200-BK The Ride Control Valve (3C) is located on the inside of the right frame rail below the cab. 1C. Accumulator 2C. Pressure Switch 3C. Ride Control Valve

RIDE CONTROL

26 The pilot operated Backhoe Valve Group (24) is located at the rear of the machine. Outlet ports to the cylinders face the rear of the machine on all models. 24. Backhoe Valve Group 25. Boom Valve 41. Swing Valve 26. Bucket Valve 40. Stick Valve 13A. E-Stick Valve

BACKHOE VALVE GROUP

The Hydraulic Tank (22) is located between the engine and the cab. The sight gauge is located on the side of the tank.

HYDRAULIC TANK

1. Pilot Accumulator 4. Pressure Reducing Valve (Stabilizer) CC. Pilot Oil Pressure Test Port

PRESSURE REDUCING VALVE

(Dimensions: 39 inches x 28 inches)

Valve - E-Stick Valve - Line Relief (Aux Loader Valve)

420D: BKC920-UP BMC1060-UP

8 10A 11A 13A

35

Valve Gp - Pilot / Left Hand Joystick

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

PUMP (2 - SECTION)

VALVES

TWO POSITION

VENTED

137-9466

Valve Gp - Pilot / Loader Joystick

LINE RESTRICTION (FIXED)

AUX

FLUID STORAGE RESERVOIRS

Valve - Line Relief (Swing)

D-9

PRESSURE COMPENSATION

P T

D-3

E-10

LINE RESTRICTION (VARIABLE)

NORMAL POSITION

D-3

43

SPRING (ADJUSTABLE)

RESTRICTION

CONTROL VALVES

33

44

VARIABILITY

AB

34

179-8289

CONTROL VALVES

4A

187-0529

212-0732

SPRING

ONE POSITION

187-0528

Valve Gp - P.C.F.R.

FLUID CONDITIONER

VALVE ENVELOPES

5

17

Valve - Line Relief (Stick)

Valve Gp - 2 Bank Loader

PUMP OR MOTOR

5A 10

Valve - Line Relief (Stick)

Valve Gp - Diverter Solenoid

1A 3

19

C-5, C-4, B-10, B-9

Cover - End (2 Stack Only)

Motor - Broom

BASIC COMPONENT SYMBOLS

14

E-11

FLUID POWER SYMBOLS

30 Page,

Accumulator - Pilot Pressure

Part Number

RENR7783-02 VOL 2 of 2

Description

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1 CYLINDER STABILIZER 173-4565

CYLINDER STABILIZER 173-4565

I

REAR AXLE LS (CYLINDER IS IN FRONT OF AXLE)

ACCUMULATOR 149-0686 CYLINDER COUPLER 178-3713

CYLINDER STEER (AWD) 214-5097

ORIFICE CHECK 255-7117

VALVE LINE RELIEF 9T-0704

FRONT OF MACHINE

LR

I

MOTOR BRUSH

ORIFICE CHECK 255-7117

RS

COVER GP AUXILIARY 194-6763

COVER GP 105-4910

CYLINDER MP BUCKET 185-1839

CYLINDER REAR STEER (442) 110-0873

VALVE GP STABILIZER 2 BANK 185-5898

RR CYLINDER STEER 167-4235

H

PILOT PRESSURE

VALVE AUXILIARY 194-6760

VALVE COUPLER 138-1979

FRONT AXLE (CYLINDER IS IN FRONT OF AXLE)

CC

H VALVE GP DIVERTER 201-0947

RS

LS

AUX

RETURN MANIFOLD 186-3629

T1

LF T3

VALVE LINE RELIEF 197-3124

RHMU

NOT USED WITH AWS

USED WITH AWS

AWS VALVE

VALVE LINE RELIEF 187-0532

T4 T5

P1

LS1

G

VALVE GP PILOT SHUT OFF 233-7132

CYLINDER TILT 192-3884

VALVE GP (AWS) 252-0634 (442)

VALVE SHUTTLE 8J-6875

USED WITH NON-AWS

S2 USED WITH AWS

CYLINDER LIFT (IT) 228-3505 (420) 192-3791 (432/442)

HMU 238-8550

VALVE GP RIDE CONTROL 243-2266

COVER GP PRESS REDUCING 239-2226

S

TILT

G

STABILIZER

STABILIZER

S3

VALVE STABILIZER 222-0364

VALVE TILT 194-6758

ACCUMULATOR 162-3960

LIFT

F

F

H

ACC

SWITCH PRESSURE (AWS) 128-5091 (442) VALVE LIFT 194-6757 T

R

(Dimensions: 39 inches x 28 inches)

SWITCH PRESSURE RIDE CONTROL 131-9203

VALVE STEER PRIORITY 200-6378 VALVE GP 2 BANK LOADER 179-8289

FILTER GP 210-6243

CONNECTOR ORIFICE 220-8219 (420)

VALVE CHECK 214-3524

VALVE GP P.C.F.R. 212-0732

CYLINDER BOOM 206-3630

COVER GP INLET 211-0180

VALVE LINE RELIEF 6E-6285

VALVE GP 3 BANK LOADER 179-8290

VALVE GP CUSHION RELIEF 206-3685

CYLINDER SWING 228-3507

CYLINDER SWING 228-3506

HMU

E

30 Page,

RENR7783-02 VOL 2 of 2

PS

CYLINDER BUCKET E-STICK 191-7839

CYLINDER BUCKET 191-7835

VALVE LINE RELIEF 137-9466

CYLINDER STICK 235-9831

CYLINDER E-STICK 191-7725

VALVE E-STICK 190-3450

VALVE LINE RELIEF 187-0528

VALVE LINE RELIEF 187-0524

COVER GP 193-9189

VALVE GP SIDE SHIFT CLAMP 3E-8622

E

S1

PRESSURE SWITCH 134-0404

D

D P

T

VALVE E-STICK 190-3450

AUX

VALVE LINE RELIEF 187-0523

VALVE BOOM BOOM 191-4480

VALVE SWING 191-4483

SWING

VALVE LINE RELIEF 187-0527

VALVE BUCKET 191-4484

BUCKET

VALVE STICK 191-4485

STICK

E-STICK

VALVE BACKHOE 4 BANK 230-1459

VALVE LINE RELIEF 187-0529

VALVE BACKHOE 5 BANK 230-1460 VALVE BACKHOE 6 BANK 230-1461

C CONNECTOR ORIFICE 164-9639

CONNECTOR ORIFICE 164-9639

COOLER RADIATOR 235-1974 TANK GP HYDRAULIC 240-9721

C

VALVE GP - PILOT RIGHT HAND JOYSTICK 185-5915

PUMP GP 244-2228 (420) 235-4109 (432/442)

BB

SIGNAL PRESSURE

CONNECTOR ORIFICE 164-9639

CONNECTOR ORIFICE 164-9639 VALVE SWITCHING 164-2274

VALVE GP - PILOT LEFT HAND JOYSTICK 185-5916

(NOT USED ON 420 NACD)

B

B BOOM DOWN

Main Pump Output. Load Sense Circuit. AWS Cylinder Control Circuit. Pilot Shutoff Control Circuit. Supply Line. Drain / Return Line. Hand Metering Unit Control Circuit. Lift Cylinder Control Circuit. Auxiliary Control Circuit. Tilt Cylinder Control Circuit. Bucket Cylinder Control Circuit. Boom Cylinder Control Circuit. Swing Cylinder Control Circuit. Bucket / E-Stick Control Circuit. Stick Cylinder Control Circuit. Stabilizer Cylinder Control Circuit. Stabilizer Cylinder Control Circuit. E-Stick Cylinder Control Circuit.

AA RAISE

RACK BACK

LOWER / FLOAT

DUMP/ REGEN

PUMP PRESSURE

A

VALVE GP - PILOT LOADER JOYSTICK 187-0521

15

14

13

12

BOOM UP

RIGHT DUMP

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

WIRED TO CONTROLLER

PUMP

LEFT

11

10

9

8

7

CURL

STICK OUT

STICK IN

LINE PATTERNS Pressure Line

A

Pilot / Load Sensing Pressure

420D, 432D AND 442D BACKHOE LOADER VOLUME 2 of 2: PARALLEL LIFT LOADER WITH CENTER PIVOT OR SIDE SHIFT LOADER RENR7783-02 PART NUMBER: 201-6839, CHANGE: 06, VERSION: (-)

Drain / Return Lines Component Group Attachment

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.

Air Line

6

5

4

3

2

1

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