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