420D - RENR7783RENR7783-02_SIS.pdf
4
420D, 432D and 442D Hydraulic System Backhoe Loader 432D: WEP1-UP TDR1-UP 442D: TBD1-UP SMJ1-UP 420D: BKC1-UP BMC1-UP Volume 1 of 2: Single Tilt Loader With Center Pivot Backhoe © 2010 Caterpillar, All Rights Reserved Printed in U.S.A. RENR7783-02 August 2010 ONE POSITION TWO POSITION THREE POSITION VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL LINES CROSSING LINES JOINING TWO - WAY THREE - WAY FOUR - WAY SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION (FIXED) PUMP (2 - SECTION) SPRING (ADJUSTABLE) VARIABILITY LINE RESTRICTION (VARIABLE) PRESSURE COMPENSATION PUMP (VARIABLE & PRESSURE COMPENSATED) MEASUREMENT PRESSURE TEMPERATURE FLOW ROTATING SHAFTS UNIDIRECTIONAL BIDIRECTIONAL PUSH - PULL LEVER PEDAL GENERAL MANUAL PUSH BUTTON SPRING FIXED DISPLACEMENT VARIABLE DISPLACEMENT NON-COMPENSATED UNIDIRECTIONAL BIDIRECTIONAL VALVE ENVELOPES VALVE PORTS FLUID CONDITIONER PUMP OR MOTOR FLUID POWER SYMBOLS UNIDIRECTIONAL BIDIRECTIONAL RELEASED PRESSURE EXTERNAL RETURN INTERNAL RETURN REMOTE SUPPLY PRESSURE SIMPLIFIED HYDRAULIC PUMPS ACCUMULATORS SPRING LOADED GAS CHARGED SOLENOID OR MANUAL SOLENOID & PILOT SOLENOID & PILOT OR MANUAL SOLENOID SERVO THERMAL DETENT HYDRAULIC & PNEUMATIC CYLINDERS DOUBLE ACTING SINGLE ACTING BASIC SYMBOL SPRING LOADED CHECK VALVES 2 POSITION INFINITE POSITIONING FLOW IN ONE DIRECTION FLOW IN EITHER DIRECTION 3 POSITION CROSS FLOW PARALLEL FLOW INTERNAL PASSAGEWAYS NORMAL POSITION AB P T AB PT SHIFTED POSITION INFINITE POSITION CONTROL VALVES ATTACHMENT MANUAL SHUTOFF SHUTTLE PILOT CONTROLLED MAIN AUX LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED) MANUAL CONTROL SYMBOLS HYDRAULIC MOTORS FLUID STORAGE RESERVOIRS CROSSING & JOINING LINES VALVES PILOT CONTROL SYMBOLS COMBINATION CONTROLS BASIC COMPONENT SYMBOLS ENERGY TRIANGLES HYDRAULIC PNEUMATIC INTERNAL SUPPLY PRESSURE COMPLETE FIXED DISPLACEMENT VARIABLE DISPLACEMENT NON-COMPENSATED HYDRAULIC SYMBOLS (ELECTRICAL) ELECTRICAL SYMBOLS TABLE 325-AG135 PK-14 HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” 325-PK-14 WIRE GAUGE WIRE COLOR CIRCUIT NUMBER IDENTIFICATION WIRE NUMBER IDENTIFICATION CODES CURRENT STANDARD PREVIOUS STANDARD ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE 325-PK WIRE COLOR CIRCUIT NUMBER IDENTIFICATION B WIRE WIRE (EXAMPLE VALVE) CURRENT STANDARD TRANSDUCER (FLUID) M ELECTRIC MOTOR TRANSDUCER (GAS / AIR) G GENERATOR PRESSURE SWITCH ELECTRICAL WIRE PRESSURE SWITCH (ADJUSTABLE) TEMPERATURE SWITCH PRESSURE SWITCH TEMPERATURE SWITCH LEVEL SWITCH FLOW SWITCH ELECTRICAL SYMBOLS (ELECTRICAL) A CIRCUIT NUMBER IDENTIFICATION WIRE COLOR WIRE GAUGE T RENR7783-02 VOL 1 of 2 30 Page, (Dimensions: 39 inches x 28 inches) Description Part Number Machine Location Schematic Location Accumulator - Pilot Pressure 149-0686 1 G-6 Valve - Stabilizer 192-0827 39 G-1, G-5 Cartridge - P.O. Check 213-4072 2 C-3 , C-7 Valve - Steer Priority 188-7471 40 E-10 Connector - Orifice (Loader Valve) 220-8219 3 E-9 Valve - Stick 201-0669 41 C-3 Connector - Orifice ( Left Hand Joystick) 164-9639 4 B-7 Valve - Swing 201-5357 42 C-6 Connector - Orifice (Switching Valve) 220-8219 5 A-6 Valve - Tilt 201-5377 43 G-10 Cooler - Radiator 235-1974 6 B-15 Valve - Tilt Down Pressure Limiter 210-6171 44 G-10 Cover - End 191-4010 7 I-9 Valve Gp - 2 Bank Loader 200-7827 45 E-9 Cover - End (Backhoe Valve) 6E-4158 8 C-1 Valve Gp - Cushion Relief 206-3685 46 D-5 Cover Gp - Inlet 211-0180 9 C-9 Valve Gp - P.C.F.R. 212-0732 47 C-9 Cylinder - Boom 206-3630 10 D-8 Valve Gp - Pilot / Left Hand Joystick 185-5916 48 A-8 Cylinder - Bucket 191-7835 11 D-4 Valve Gp - Pilot / Right Hand Joystick 185-5915 49 A-3 Cylinder - Lift (ST) 230-0980 12 G-11 Valve Gp - Pilot Shut Off 233-7132 50 F-7 Cylinder - Stabilizer (Left) 228-3499 13 H-4 Valve Gp - P-Lever 2 Bank/Detents/SW 185-5900 51 G-7 Cylinder - Stabilizer (Right) 228-3500 14 H-2 Valve Gp - Pressure Reducing 239-2226 52 F-6 Cylinder - Steer 167-4325 15 E-13 Valve Gp - Stabilizer (2 Bank RE-Relief) 185-5898 53 G-1 Cylinder - Stick 235-9829 16 D-3 Cylinder - Swing 228-3506 17 D-6 Cylinder - E-Stick 191-7725 1A C-2 Cylinder - Tilt (ST) 200-7128 18 H-11 Cylinder - E-Stick Bucket 191-7839 2A D-4 Filter 210-6243 19 G-13 Cylinder - MP Bucket 185-1839 3A I-13 Hand Metering Unit (HMU) 238-8550 20 D-14 Valve - Auxiliary (Backhoe Valve) 190-3450 4A C-8 Manifold - Return 186-3629 21 F-7 Valve - Auxiliary (Loader Valve) 124-8818 5A H-10 Pump Gp 244-2228 22 B-13 Tank Gp - Hydraulic 240-9721 23 B-14 Valve - Backhoe (5 Bank) 201-0666 7A C-1 Valve - Backhoe (6 Bank) 201-0667 9A C-1 Valve - Backhoe 201-0665 25 C-1 Valve - E-Stick 201-0664 10A C-1 Valve - Boom 201-0668 26 C-7 Valve - Line Relief (Aux Loader Valve) 9T-0704 11A I-9 Valve - Bucket 201-5358 27 C-4 Valve - Line Relief (E-Stick) 132-5303 12A C-2 Valve - Check 214-3524 28 C-10 Valve - Pressure Controller (E-Stick) 211-3539 13A C-2 Valve - Lift 130-6520 29 F-10 Valve - Switching 164-2274 14A A-6 Valve - Line Relief (Boom) 187-0523 30 C-8 Valve Gp - 3 Bank Loader 200-7828 15A E-9 Valve - Line Relief (Boom) 6E-6285 31 C-8 Valve - Line Relief (Bucket) 187-0524 32 C-5 Accumulator - Ride Control 162-3960 1B D-12 Valve - Line Relief (Bucket) 187-0527 33 C-5 Switch - Pressure 131-9203 2B C-11 Valve - Line Relief (Stick) 187-0529 34 C-3 Valve Gp - Ride Control 243-2266 3B D-12 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 Component Locations (Volume 1) Attachments Ride Control 44 15 3A 3 5A 7 11A 15A 29 37 38 40 18 3B 21 1 51 14 39 52 53 13 8 30 2 4A 5 7A 9 9A 10A 12A 13A 25 26 27 28 31 32 33 34 35 36 41 42 46 47 2A 11 1A 16 17 14A 4 49 10 20 23 6 12 2B 1B 50 19 22 43 45 48 MACHINE COMPONENT LOCATIONS Switch - Differential Pressure 134-0404 G-13 Tap Locations (Volume 1) Pressure, Sampling, and Sensor Tap Number Description Schematic Location AA Pump Pressure Test Port A-12 BB Pump Signal Pressure Test Port B-12 CC Pilot Pressure Test Port G-6 Description Media Number 420D Backhoe Loader (BKC) SEBP3583 420D Backhoe Loader (BMC) SEBP3584 432D Backhoe Loader (WEP & TDR) SEBP3971 442D Backhoe Loader (TBD & SMJ) SEBP3967 Specifications: (Hydraulic & Steering System) RENR7778 Testing and Adjusting: (Hydraulic & Steering System) RENR7779 Specifications: (Axles, Differentials & Brakes) RENR7776 Testing and Adjusting: (Axles, Differentials & Brakes) RENR7777 Schematic: (Electrical system) RENR7781 Related Manuals Parts Manual Machine System Electrical System 22. Hydraulic Pump 19. Filter 45. Loader Valve Group BB. Signal Pressure Test Port 22. Hydraulic Pump AA. Pump Pressure Test Port AA 22 1. Pilot Accumulator 52. Pressure Reducing Valve (Stabilizer) CC. Pilot Oil Pressure Test Port HYDRAULIC PUMP PRESSURE REDUCING VALVE PILOT SHUT OFF VALVE 54 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 54 1B 2B Ride Control Pressure Switch F738-WH 200-BK 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). BACKHOE VALVE GROUP 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 LOADER VALVE GROUP 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). HYDRAULIC TANK The Hydraulic Tank (23) is located between the engine and the cab. The sight gauge is located on the side of the tank. CC 52 1 3B 1B Ride Control Solenoid 976-OR 200-BK 50 21 45 19 22 BB 25 26 42 41 10A 27 5A 43 29 40 23 Sight Gauge Drain Tube 47
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Transcript of 420D - RENR7783RENR7783-02_SIS.pdf
420D, 432D and 442D
Hydraulic SystemBackhoe Loader
432D:WEP1-UPTDR1-UP
442D:TBD1-UPSMJ1-UP
420D:BKC1-UPBMC1-UP
Volume 1 of 2: Single Tilt Loader With Center Pivot Backhoe
© 2010 Caterpillar, All Rights Reserved Printed in U.S.A.
RENR7783-02August 2010
ONE POSITION TWO POSITION THREE POSITION
VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO - WAY THREE - WAY FOUR - WAY
SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)
PUMP(2 - SECTION)
SPRING(ADJUSTABLE)
VARIABILITY LINE RESTRICTION(VARIABLE)
PRESSURECOMPENSATION
PUMP(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID &PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASICSYMBOL
SPRINGLOADED
CHECK VALVES
2 POSITIONINFINITE
POSITIONING
FLOW IN ONEDIRECTION
FLOW INEITHER
DIRECTION
3 POSITION
CROSSFLOW
PARALLELFLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P TSHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOTCONTROLLED
MAIN AUX
LINE RESTRICTION(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLESHYDRAULIC PNEUMATIC
INTERNALSUPPLY PRESSURE
COMPLETE
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS “AG”
325-PK-14
WIRE GAUGE
WIRE COLOR
CIRCUIT NUMBERIDENTIFICATION
WIRE NUMBER IDENTIFICATION CODES
CURRENT STANDARD
PREVIOUS STANDARD
ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE
325-PK
WIRE COLORCIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER(FLUID)
MELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH(ADJUSTABLE)
TEMPERATURESWITCH
PRESSURESWITCH
TEMPERATURESWITCH
LEVELSWITCH
FLOWSWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBERIDENTIFICATION
WIRECOLOR
WIRE GAUGE
T
RE
NR
7783-0
2 V
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1 o
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30
Pa
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Description PartNumber
MachineLocation
SchematicLocation
Accumulator - Pilot Pressure 149-0686 1 G-6
Valve - Stabilizer 192-0827 39 G-1, G-5
Cartridge - P.O. Check 213-4072 2 C-3 , C-7
Valve - Steer Priority 188-7471 40 E-10
Connector - Orifice (Loader Valve) 220-8219 3 E-9
Valve - Stick 201-0669 41 C-3
Connector - Orifice ( Left Hand Joystick) 164-9639 4 B-7
Valve - Swing 201-5357 42 C-6
Connector - Orifice (Switching Valve) 220-8219 5 A-6
Valve - Tilt 201-5377 43 G-10
Cooler - Radiator 235-1974 6 B-15
Valve - Tilt Down Pressure Limiter 210-6171 44 G-10
Cover - End 191-4010 7 I-9
Valve Gp - 2 Bank Loader 200-7827 45 E-9
Cover - End (Backhoe Valve) 6E-4158 8 C-1
Valve Gp - Cushion Relief 206-3685 46 D-5
Cover Gp - Inlet 211-0180 9 C-9
Valve Gp - P.C.F.R. 212-0732 47 C-9
Cylinder - Boom 206-3630 10 D-8
Valve Gp - Pilot / Left Hand Joystick 185-5916 48 A-8
Cylinder - Bucket 191-7835 11 D-4
Valve Gp - Pilot / Right Hand Joystick 185-5915 49 A-3
Cylinder - Lift (ST) 230-0980 12 G-11
Valve Gp - Pilot Shut Off 233-7132 50 F-7
Cylinder - Stabilizer (Left) 228-3499 13 H-4
Valve Gp - P-Lever 2 Bank/Detents/SW 185-5900 51 G-7
Cylinder - Stabilizer (Right) 228-3500 14 H-2
Valve Gp - Pressure Reducing 239-2226 52 F-6
Cylinder - Steer 167-4325 15 E-13
Valve Gp - Stabilizer (2 Bank RE-Relief) 185-5898 53 G-1
Cylinder - Stick 235-9829 16 D-3Cylinder - Swing 228-3506 17 D-6
Cylinder - E-Stick 191-7725 1A C-2
Cylinder - Tilt (ST) 200-7128 18 H-11
Cylinder - E-Stick Bucket 191-7839 2A D-4
Filter 210-6243 19 G-13
Cylinder - MP Bucket 185-1839 3A I-13
Hand Metering Unit (HMU) 238-8550 20 D-14
Valve - Auxiliary (Backhoe Valve) 190-3450 4A C-8
Manifold - Return 186-3629 21 F-7
Valve - Auxiliary (Loader Valve) 124-8818 5A H-10
Pump Gp 244-2228 22 B-13Tank Gp - Hydraulic 240-9721 23 B-14
Valve - Backhoe (5 Bank) 201-0666 7A C-1Valve - Backhoe (6 Bank) 201-0667 9A C-1
Valve - Backhoe 201-0665 25 C-1
Valve - E-Stick 201-0664 10A C-1
Valve - Boom 201-0668 26 C-7
Valve - Line Relief (Aux Loader Valve) 9T-0704 11A I-9
Valve - Bucket 201-5358 27 C-4
Valve - Line Relief (E-Stick) 132-5303 12A C-2
Valve - Check 214-3524 28 C-10
Valve - Pressure Controller (E-Stick) 211-3539 13A C-2
Valve - Lift 130-6520 29 F-10
Valve - Switching 164-2274 14A A-6
Valve - Line Relief (Boom) 187-0523 30 C-8
Valve Gp - 3 Bank Loader 200-7828 15A E-9
Valve - Line Relief (Boom) 6E-6285 31 C-8Valve - Line Relief (Bucket) 187-0524 32 C-5
Accumulator - Ride Control 162-3960 1B D-12
Valve - Line Relief (Bucket) 187-0527 33 C-5
Switch - Pressure 131-9203 2B C-11
Valve - Line Relief (Stick) 187-0529 34 C-3
Valve Gp - Ride Control 243-2266 3B D-12
Valve - Line Relief (Stick) 187-0528 35 C-3Valve - Line Relief (Swing) 137-9466 36 C-6Valve - Line Relief (Tilt) 6E-6285 37 H-9Valve - Line Relief (Tilt) 204-4313 38 H-9
Component Locations (Volume 1)
Attachments
Ride Control
44 15 3A
3 5A 7 11A 15A
29 37 38 40
18
3B
21151
14 39
52 5313
8
30
2 4A 5 7A
9 9A 10A 12A 13A
25 26 27 28
31 32 33 34 3536 41 42 46 47
2A 11
1A
16
17
14A 4 49
10
20
23
6
12
2B1B
50
19 22
4345
48
MACHINE COMPONENT LOCATIONS
Switch - Differential Pressure 134-0404 G-13
Tap Locations (Volume 1)Pressure, Sampling, and Sensor
TapNumber Description Schematic
LocationAA Pump Pressure Test Port A-12BB Pump Signal Pressure Test Port B-12CC Pilot Pressure Test Port G-6
Description Media Number
420D Backhoe Loader (BKC) SEBP3583
420D Backhoe Loader (BMC) SEBP3584
432D Backhoe Loader (WEP & TDR) SEBP3971
442D Backhoe Loader (TBD & SMJ) SEBP3967
Specifications: (Hydraulic & Steering System) RENR7778
Testing and Adjusting: (Hydraulic & Steering System) RENR7779
Specifications: (Axles, Differentials & Brakes) RENR7776
Testing and Adjusting: (Axles, Differentials & Brakes) RENR7777
Schematic: (Electrical system) RENR7781
Related Manuals
Parts Manual
Machine System
Electrical System
22. Hydraulic Pump19. Filter45. Loader Valve GroupBB. Signal Pressure Test Port
22. Hydraulic PumpAA. Pump Pressure Test Port
AA22
1. Pilot Accumulator52. Pressure Reducing Valve (Stabilizer)CC. Pilot Oil Pressure Test Port
HYDRAULIC PUMP
PRESSURE REDUCING VALVE
PILOT SHUT OFF VALVE
54
The Ride Control Valve (3B) is located on the inside of theright frame rail below the cab.1B. Accumulator2B. Pressure Switch3B. Ride Control Valve
RIDE CONTROL
54
1B
2B
Ride ControlPressure SwitchF738-WH200-BK
The Pilot Shutoff Valve (50) is mounted to the front of therear axle. The optional Pattern Changeover Valve (47) for the Backhoe Valve Group is mounted on the right side of therear frame. The valve allows the operator to change from the excavator pattern to the backhoe pattern. Also shown is thePilot Return Manifold (21).
BACKHOE VALVE GROUP
The pilot operated Backhoe Valve Group (25) is located at the rear of the machine. Outlet ports to the cylinders facethe rear of the machine on all models.25. Backhoe Valve Group26. Boom Valve42. Swing Valve27. Bucket Valve41. Stick Valve10A. E-Stick Valve
LOADER VALVE GROUP
The Loader Valve Group (45) consists of an inlet manifold with a Steering Priority Valve (40), a loader Lift ControlValve (29), a Tilt Control Valve (43), and an optional Auxiliary Valve (5A).
HYDRAULIC TANK
The Hydraulic Tank (23) is located between the engine and the cab. The sight gauge is located on the side of the tank.
CC 52
1
3B
1B
Ride ControlSolenoid976-OR200-BK
50
21
45
19
22
BB
25
26
42
41
10A
27
5A 43
29
40
23
Sight Gauge
Drain Tube
47
RE
NR
7783-0
2 V
OL
1 o
f 2
30
Pa
ge
, (D
ime
ns
ion
s:
39
in
ch
es
x 2
8 i
nc
he
s)
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.
420D, 432D AND 442D BACKHOE LOADERVOLUME 1 of 2: SINGLE TILT LOADER W/ CENTER PIVOT BACKHOE
PART NUMBER: 201-6839, CHANGE: 06, VERSION: (-)RENR7783-02
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSMain Pump Output.Load Sense Circuit.
Supply Line.Drain / Return Line.Hand Metering Unit Control Circuit.Lift Cylinder Control Circuit.Auxiliary Control Circuit.Tilt Cylinder Control Circuit.
Pilot Shutoff 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 SWITCH134-0404
CYLINDERMP BUCKET185-1839
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
SIGNALPRESSURE
ACC H
RT
PUMPPRESSURE
HMU
PUMP
VALVELINE RELIEF6E-6285
VALVETILT201-5377
VALVELIFT130-6520
VALVE GP2 BANK LOADER200-7827
PUMP GP244-2228
TANK GPHYDRAULIC240-9721
COOLERRADIATOR235-1974
HMU238-8550
CYLINDERLIFT230-0980
CYLINDERTILT200-7128
CYLINDERSTEER167-4235
VALVE GP (ATTCH)3 BANK LOADER200-7828
VALVESTEER PRIORITY188-7471
VALVEAUXILIARY124-8818
VALVELINE RELIEF9T-0704
LIFT
TILT
AUX
VALVE GPRIDE CONTROL243-2266
ACCUMULATOR162-3960
SWITCHPRESSURERIDE CONTROL131-9203
END COVER191-4010
VALVELINE RELIEF204-4313
VALVETILT DOWNPRESS LIMITER210-6171
CONNECTORORIFICE220-8219
P1
PILOTPRESSURE
USED WITHAWS
USED WITHNON-AWS
CYLINDER (ATTCH)E-STICK BUCKET191-7839
AUX BOOM SWING BUCKET STICK E-STICK
CYLINDERBOOM206-3630
CYLINDERSWING228-3506
CYLINDERBUCKET191-7835
CYLINDERSTICK235-9829
CYLINDERE-STICK191-7725
VALVEE-STICK201-0664
VALVEBUCKET201-5358
VALVESTICK201-0669
VALVESWING201-5357
VALVEBOOM201-0668
VALVEAUXILIARY190-3450
BOOM UP RIGHTLEFTBOOM DOWNDUMP STICK OUT STICK INCURL
VALVE GP - PILOTLEFT HAND JOYSTICK185-5916
VALVE GP - PILOTRIGHT HAND JOYSTICK185-5915
VALVE GP STABILIZER2 BANK185-5898
UP DOWN UPDOWN
VALVE GPPILOT SHUT OFF233-7132
VALVESWITCHING164-2274
STABILIZER (LEFT) STABILIZER (RIGHT)
VALVE GP - PILOT2 BANK STABILIZER185-5900
CYLINDERSTABILIZER228-3499
CYLINDERSTABILIZER228-3500
VALVEBACKHOE6 BANK201-0667
VALVEBACKHOE5 BANK201-0666
VALVEBACKHOE201-0665
COVER GPINLET211-0180
T1
T3
T4
RETURNMANIFOLD186-3629
S2
S3
S1
P
T
S
VALVE GPPRESSUREREDUCING239-2226
ACCUMULATOR149-0686
USED WITH PL LOADER
VALVE GPCUSHION RELIEF206-3685
END COVER6E-4158
VALVEP.C.F.R.212-0732
VALVEPRESSURECONTROLLER211-3539
VALVELINE RELIEF132-5303
VALVECHECK214-3524
CARTRIDGEP.O. CHECK213-4072
CARTRIDGEP.O. CHECK213-4072
CONNECTORORIFICE164-9639
CONNECTORORIFICE220-8219
VALVELINE RELIEF187-0528
VALVELINE RELIEF187-0524
VALVELINE RELIEF187-0527
VALVELINE RELIEF187-0529
VALVELINE RELIEF137-9466
VALVELINE RELIEF137-9466
VALVELINE RELIEF187-0523
VALVELINE RELIEF6E-6285
AA
BB
CC
PS
A
B
C
D
E
F
G
H
I
A
B
C
D
E
F
G
H
I
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
FILTER GP210-6243
VALVESTABILIZER192-0827
420D, 432D and 442D
Hydraulic SystemBackhoe Loader
432D:WEP1-UPTDR1-UP
442D:TBD1-UPSMJ1-UP
420D:BKC920-UPBMC1060-UP
Volume 2 of 2: Parallel Lift Loader With Center Pivot Or Side Shift Backhoe
© 2010 Caterpillar, All Rights Reserved Printed in U.S.A.
RENR7783-02August 2010
ONE POSITION TWO POSITION THREE POSITION
VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO - WAY THREE - WAY FOUR - WAY
SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)
PUMP(2 - SECTION)
SPRING(ADJUSTABLE)
VARIABILITY LINE RESTRICTION(VARIABLE)
PRESSURECOMPENSATION
PUMP(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID &PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASICSYMBOL
SPRINGLOADED
CHECK VALVES
2 POSITIONINFINITE
POSITIONING
FLOW IN ONEDIRECTION
FLOW INEITHER
DIRECTION
3 POSITION
CROSSFLOW
PARALLELFLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P TSHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOTCONTROLLED
MAIN AUX
LINE RESTRICTION(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLESHYDRAULIC PNEUMATIC
INTERNALSUPPLY PRESSURE
COMPLETE
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS “AG”
325-PK-14
WIRE GAUGE
WIRE COLOR
CIRCUIT NUMBERIDENTIFICATION
WIRE NUMBER IDENTIFICATION CODES
CURRENT STANDARD
PREVIOUS STANDARD
ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE
325-PK
WIRE COLORCIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER(FLUID)
MELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH(ADJUSTABLE)
TEMPERATURESWITCH
PRESSURESWITCH
TEMPERATURESWITCH
LEVELSWITCH
FLOWSWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBERIDENTIFICATION
WIRECOLOR
WIRE GAUGE
T
RE
NR
7783-0
2 V
OL
2 o
f 2
30
Pa
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, (D
ime
ns
ion
s:
39
in
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es
x 2
8 i
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Description PartNumber
MachineLocation
SchematicLocation
Accumulator - Pilot Pressure 149-0686 1 H-6
Valve - Swing 191-4483 41 D-6
Connector - Orifice (Loader Valve) 220-8219 2 E-11
Valve - Tilt 194-6758 42 G-11
Connector - Orifice ( Loader Joystick) 164-9639 3 C-5, C-4, B-10, B-9
Valve Gp - 2 Bank Loader 179-8289 43 E-10
Cover Gp - Pressure Reducing Valve 239-2226 4 G-5
Valve Gp - P.C.F.R. 212-0732 44 D-9
Cooler - Radiator 235-1974 5 C-15
Valve Gp - Pilot / Left Hand Joystick 185-5916 45 B-5
Cover - End (2 Stack Only) 105-4910 6 I-10
Valve Gp - Pilot / Loader Joystick 187-0521 46 A-10
Cover - End (Backhoe Valve) 193-9189 7 D-1
Valve Gp - Pilot / Right Hand Joystick 185-5915 47 B-2
Cover Gp - Inlet 211-0180 8 D-8
Valve Gp - Pilot Shut Off 233-7132 48 G-6
Cylinder - Boom 206-3630 9 E-7
Valve Gp - Side Shift Clamp 3E-8622 49 D-1
Cylinder - Bucket 191-7835 10 E-4
Valve Gp - Stabilizer (2 Bank RE-Relief) 185-5898 50 I-1
Cylinder - Lift (IT) (420D)Cylinder - Lift (IT) (432D & 442D)
228-3505192-3791 11 F-12
Cylinder - Stabilizer 173-4565 12 I-2, I-4
Cover Gp - Used W/ Aux Loader Valve 194-6763 1A I-10
Cylinder - Steer 167-4235 13 H-12
Cylinder - AWD Steer (Front) 214-5097 2A H-12
Cylinder - Stick 235-9831 14 E-3
Cylinder - Coupler 178-3713 3A H-12
Cylinder - Swing 228-3507 15 E-6
Cylinder - E-Stick 191-7725 4A E-2
Cylinder - Swing 228-3506 16 E-6
Cylinder - E-Stick Bucket 191-7839 5A E-4
Cylinder - Tilt (IT) 192-3884 17 G-12
Cylinder - MP Bucket 185-1839 6A H-12
Filter 210-6243 18 D-15
Motor - Broom - - - - 7A I-12
Hand Metering Unit (HMU) 238-8550 19 F-14
Valve - Auxiliary (Loader Valve) 194-6760 8A H-10
Manifold - Return 186-3629 20 H-7
Valve - Backhoe (5 Bank) 230-1460 10A D-1Valve - Backhoe (6 Bank) 230-1461 11A D-1
Tank Gp - Hydraulic 240-9721 22 B-14
Valve - Coupler 138-1979 12A H-11
Switch - Differential Pressure 134-0404 23 D-15
Valve - E-Stick 190-3450 13A D-2, D-8
Valve - Backhoe (4 Bank) 230-1459 24 D-1
Valve - Line Relief (Aux Loader Valve) 9T-0704 14A H-10
Valve - Boom 191-4480 25 D-7
Valve - Switching 164-2274 15A B-3
Valve - Bucket 191-4484 26 D-4
Valve Gp - 3 Bank Loader 179-8290 16A E-10
Valve - Check 214-3524 27 E-9
Valve Gp - Cushion Relief 206-3685 17A E-5
Valve - Lift 194-6757 28 F-11
Valve Gp - Diverter Solenoid 201-0947 18A H-11
Valve - Line Relief (Boom) 187-0523 29 D-7Valve - Line Relief (Boom) 6E-6285 30 D-7
Cylinder - Rear Steer 110-0873 1B I-14
Valve - Line Relief (Bucket) 187-0524 31 D-4
Switch - Pressure 128-5091 2B E-14
Valve - Line Relief (Bucket) 187-0527 32 D-4
Valve Gp - All Wheel Steer 121-4449 3B G-14
Valve - Line Relief (Stick) 187-0529 33 D-3Valve - Line Relief (Stick) 187-0528 34 D-3
Accumulator - Ride Control 162-3960 1C F-13
Valve - Line Relief (Swing) 137-9466 35 D-6
Switch - Pressure 131-9203 2C E-12
Valve - Line Relief (Tilt) 187-0532 36 G-11
Valve Gp - Ride Control 252-0634 3C F-13
Valve - Line Relief (Tilt) 197-3124 37 G-10Valve - Stabilizer 222-0364 38 H-2, H-4Valve - Steer Priority 200-6378 39 E-11Valve - Stick 191-4485 40 D-3
Component Locations (Volume 2)
Attachments
Ride Control
Pump Gp (420D)Pump Gp (432D & 442D)
21 B-13244-2228235-4109
All Wheel Steer
Tap Locations (Volume 2)Pressure, Sampling, and Sensor
TapNumber Description Schematic
LocationAA Pump Pressure Test Port A-12BB Pump Signal Pressure Test Port B-12CC Pilot Pressure Test Port H-5
Description Media Number
420D Backhoe Loader (BKC) SEBP3583420D Backhoe Loader (BMC) SEBP3584432D Backhoe Loader (WEP & TDR) SEBP3971442D Backhoe Loader (TBD & SMJ) SEBP3967
Specifications: (Hydraulic & Steering System) RENR7778Testing and Adjusting: (Hydraulic & Steering System) RENR7779Specifications: (Axles, Differentials & Brakes) RENR7776Testing and Adjusting: (Axles, Differentials & Brakes) RENR7777
Schematic: (Electrical system) RENR7781
Related Manuals
Parts Manual
Machine System
Electrical System
1B
2A
3B
13 3A 7A 12A 18A6A
17
2 6
8A 14A
16A 28 36
37 42 43
111C 2C 3C
22
18
1A 3 46
4
21
12
5
11A 13A
50
1 38
19
2B4820
23
9
15 16
5A 10
14
474515A
10A87
2726252417A
3332313029
4441403534
7273747549
77
4A
MACHINE COMPONENT LOCATIONS
4B5B
Valve - Shuttle 8J-6875Orifice - Check 255-7117
23
4B 5B
21. Hydraulic Pump18. Filter43. Loader Valve GroupBB. Signal Pressure Test Port
21. Hydraulic PumpAA. Pump Pressure Test Port
AA21
HYDRAULIC PUMP
The Ride Control Valve (3C) is located on the inside of theright frame rail below the cab.1C. Accumulator2C. Pressure Switch3C. Ride Control Valve
RIDE CONTROL
1C
2C
Ride ControlPressure SwitchF738-WH200-BK
PILOT SHUT OFF VALVE
The Pilot Shutoff Valve (48) is mounted to the front of therear axle. The optional Pattern Changeover Valve (44) forthe Backhoe Valve Group is mounted on the right side of therear frame. The valve allows the operator to change from the excavator pattern to the backhoe pattern. Also shown is thePilot Return Manifold (20).
BACKHOE VALVE GROUP
The pilot operated Backhoe Valve Group (24) is located at the rear of the machine. Outlet ports to the cylinders facethe rear of the machine on all models.24. Backhoe Valve Group25. Boom Valve41. Swing Valve26. Bucket Valve40. Stick Valve13A. E-Stick Valve
LOADER VALVE GROUP
The Loader Valve Group (43) consists of an inlet manifold with a Steering Priority Valve (39), a loader Lift ControlValve (28), a Tilt Control Valve (42), and an optionalAuxiliary Valve (8A).
HYDRAULIC TANK
The Hydraulic Tank (22) is located between the engine and the cab. The sight gauge is located on the side of the tank.
1. Pilot Accumulator4. Pressure Reducing Valve (Stabilizer)CC. Pilot Oil Pressure Test Port
PRESSURE REDUCING VALVE
FRONT VIEWLEFT SIDE VIEW
3A
12A12A
3A. Coupler Cylinder 12A. Coupler Valve
Coupler Solenoid163-WH779-WH
COUPLER CYLINDER / VALVE
AWSPressureSwitchG787-BRE764-OR
AWS PRESSURE SWITCH
2B. All Wheel Steer Pressure Switch
G-14H-14
43
18
21
BB
3C
1C
Ride ControlSolenoid976-OR200-BK
48
2044
24
25
41
40
13A
26
8A 42
28
39
22
Sight Gauge
Drain Tube
CC 4
1
2B
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSMain Pump Output.Load Sense Circuit.
Supply Line.Drain / Return Line.Hand Metering Unit Control Circuit.Lift Cylinder Control Circuit.Auxiliary Control Circuit.Tilt Cylinder Control Circuit.
Pilot Shutoff 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.
AWS Cylinder Control Circuit.
RE
NR
7783-0
2 V
OL
2 o
f 2
30
Pa
ge
, (D
ime
ns
ion
s:
39
in
ch
es
x 2
8 i
nc
he
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Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
420D, 432D AND 442D BACKHOE LOADERVOLUME 2 of 2: PARALLEL LIFT LOADER WITH CENTER PIVOT OR SIDE SHIFT LOADER
PART NUMBER: 201-6839, CHANGE: 06, VERSION: (-)RENR7783-02
A
B
C
D
E
F
G
H
I
A
B
C
D
E
F
G
H
I
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
VALVELINE RELIEF187-0524
VALVELINE RELIEF187-0527
AA
BB
CC
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
PRESSURE SWITCH134-0404
NOT USEDWITH AWS
SIGNALPRESSURE
PUMPPRESSURE
HMU
(NOT USED ON 420 NACD)
PUMP
LIFT
TILT
AUX
COOLERRADIATOR235-1974
TANK GP HYDRAULIC240-9721
PUMP GP244-2228 (420)235-4109 (432/442)
HMU238-8550
SWITCHPRESSURE (AWS)128-5091 (442)
VALVESTEER PRIORITY200-6378
VALVELIFT194-6757
VALVETILT194-6758
CYLINDERLIFT (IT)228-3505 (420)192-3791 (432/442)
VALVELINE RELIEF9T-0704
CYLINDERMP BUCKET185-1839
CYLINDERSTEER167-4235
VALVE GP2 BANK LOADER179-8289
VALVE GP3 BANK LOADER179-8290
CYLINDERTILT192-3884
RACK BACKRAISE LOWER /FLOAT
DUMP/REGEN
WIRED TOCONTROLLER
VALVE GP - PILOTLOADER JOYSTICK187-0521
CONNECTORORIFICE164-9639
CONNECTORORIFICE164-9639
COVER GP105-4910
COVER GP AUXILIARY194-6763
VALVE GPDIVERTER201-0947
CYLINDERCOUPLER178-3713
MOTORBRUSH
CONNECTORORIFICE220-8219 (420)
VALVECOUPLER138-1979
RSLS
PILOTPRESSURE
USED WITHNON-AWS
USED WITHAWS
CYLINDERBUCKETE-STICK191-7839
CYLINDERBOOM206-3630
CYLINDERSWING228-3506
CYLINDERBUCKET191-7835
CYLINDERSTICK235-9831 CYLINDER
E-STICK191-7725
VALVEE-STICK190-3450
VALVELINE RELIEF187-0528
VALVELINE RELIEF137-9466VALVE
LINE RELIEF6E-6285
VALVEBUCKET191-4484
VALVELINE RELIEF187-0529
VALVESTICK191-4485
VALVESWING191-4483
VALVEBOOM191-4480
VALVELINE RELIEF187-0523
VALVEE-STICK190-3450
BOOM UP RIGHTLEFTBOOM DOWNDUMP STICK OUT STICK INCURL
VALVE GP - PILOTLEFT HAND JOYSTICK185-5916
VALVE GP - PILOTRIGHT HAND JOYSTICK185-5915
VALVE GPPILOT SHUT OFF233-7132
VALVESWITCHING164-2274
STABILIZER STABILIZER
CYLINDERSTABILIZER173-4565
CYLINDERSTABILIZER173-4565
AUX BOOM SWING BUCKET STICK E-STICK
COVER GP193-9189
VALVE GPSIDE SHIFTCLAMP3E-8622
CYLINDERSWING228-3507
COVER GPINLET211-0180
T1
T3
T4
P1
S2
P
T
RETURN MANIFOLD186-3629
S3
S
S1
COVER GPPRESS REDUCING239-2226
ACCUMULATOR149-0686
T5
VALVE GPCUSHION RELIEF206-3685
VALVE GPP.C.F.R.212-0732
VALVECHECK214-3524
VALVELINE RELIEF187-0532
CONNECTORORIFICE164-9639
CONNECTORORIFICE164-9639
VALVESTABILIZER222-0364
VALVE GPSTABILIZER2 BANK185-5898
VALVEBACKHOE6 BANK230-1461
VALVEBACKHOE5 BANK230-1460
VALVEBACKHOE4 BANK230-1459
VALVEAUXILIARY194-6760
FRONT OF MACHINE
FRONT AXLE(CYLINDER IS INFRONT OF AXLE)
CYLINDERSTEER (AWD)214-5097
CYLINDERREAR STEER (442)110-0873
REAR AXLE(CYLINDER IS INFRONT OF AXLE)
RHMU
LF
RRLR
USED WITHAWSAWS VALVE
VALVE GP(AWS)252-0634 (442)
VALVE SHUTTLE8J-6875
ORIFICECHECK255-7117
ORIFICECHECK255-7117
LS1
VALVELINE RELIEF197-3124
FILTER GP210-6243
ACC H
RT
VALVE GPRIDE CONTROL243-2266
ACCUMULATOR162-3960
SWITCHPRESSURERIDE CONTROL131-9203
PS
LS RS
