422E, 428E, 432E, 434E, 442E, and
Hydraulic System
444E Backhoe Loader
Volume 1 of 2: Implement and Steering Circuits
© 2012 Caterpillar, All Rights Reserved Printed in U.S.A.
KENR8846-03
September 2012
422E:
MAW1-UP
428E:
DPH1-UP
432E:
JBA1-UP
434E:
SEF1-UP
SJL1-UP
444E:
NBA1-UP
442E:
EME1-UP
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 PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-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
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
PT
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 MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR8846-03 VOL 1 of 2
30 Page, (Dimensions: 39 inches x 28 inches)
IMPLEMENT PUMP AND FILTER
(VIEWED FROM BOTTOM)
System Pressure
Signal Pressure
Hydraulic Supply
Pilot Oil Pressure
Hydraulic Return Oil Sampling
VALVE GP-BANK 7
(VIEWED FROM ABOVE)
Description 422E 428E 434E MECH 432E 442E 434E 444E
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic 149-0686 149-0686 149-0686 149-0686 149-0686
Accumulator Gp - Ride Control 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672
Cylinder Gp - Backhoe Bucket 320-5937 320-5937 320-5937 320-5937 320-5937 320-59
37 320-5937
Cylinder Gp - Boom 320-5936 320-5936 320-5936 320-6520 320-6522 320-6520 320-6522
Cylinder Gp - E-Stick (OPT) 320-5935 320-5935 320-5935 320-5935 320-5935 320-5935 320-5935
Cylinder Gp - Lift 215-7298 320-5934
249-6711 RH
249-6710 LH
320-5934 320-5934
249-6711 RH
249-6710 LH
249-6713 RH
249-6712 LH
Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223
Cylinder Gp - Powered Sideshift 347-222
3 347-2223 347-2223 347-2223 347-2223 347-2223
Cylinder Gp - Stabilizer, Left 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938
Cylinder Gp - Stabilizer, Rightz 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938
Cylinder Gp - Stick 320-5932 320-5932 320-5932 320-6521 320-6523 320-6521 320-6523
Cylinder Gp - Swing, Left Hand 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381
Cylinder Gp - Swing, Rig
ht Hand 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556
Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372
Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372
Filter Gp - Oil 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257
Manifold and Solenoid Gp - Control 300-4493 300-4493 300-4493 300-4493
Manifold Gp - Control 300-4491 300-4491 300-4491 300-449
1
Manifold Gp - Ride Control 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780
Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370
Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370
Pump Gp - Metering (Steering Lines) 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011
Sensor Gp - Temperature (Hydraulic Oil) 264-4297 264-4297 264-4297 264-4297
Switc
h As - Press., Hydraulic Oil Filter Bypass 134-0404 134-0404 134-0404 134-0404
Switch As - Pressure, Ride Control (OPT) 131-9203 131-9203 131-9203 131-9203 131-9203 131-9203
Tank Gp - 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777
Valve As - All Wheel Steer 340-7028 340-7028(OPT) 340-7028 340-7028
Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226
Valve As - Brake, Boosted 220-8226 220-8226 22
0-8226 220-8226 220-8226
Valve Gp - Bank 2, Mechanical 323-1085
Valve Gp - Bank 3, Mechanical 316-9785 316-9784 316-9784 321-9976 321-9976 321-9976 321-9976
Valve Gp - Bank 7, Mechanical 316-9782 316-9782 316-9782 321-9975 321-9975 321-9975 321-9975
Valve Gp - Brake Control, Unboosted 206-1769 206-1769
Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155
Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-21
55 319-2155
Valve Gp - Control, 9th Auxiliary 319-2158 319-2158 319-2158 319-2158
Valve Gp - Coupler 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615
Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128
Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128
Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437
Valve
Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437
Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129
Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129
Valve Gp - Pilot (Backhoe) 347-2208 347-2208 347-2208 347-2208
Valve Gp - Pilot (Loader) 267-2760 267-2760 267-2760 267-2760
Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2
156 319-2156 319-2156
Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156
Valve Gp - Pilot, 9th Auxiliary 244-6735 244-6735 244-6735 244-6735
Valve Gp - Pilot, Stabilizer 297-4394 297-4394 297-4394 297-4394
Valve Gp - Pilot, Stabilizer (Alarm) 297-4395 297-4395 297-4395 297-4395
Valve Gp - Press. Redc, PRV (Brake) 344-1353
Valve Gp - Pressure Control 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812
V
alve Gp - Sol., Powered Sideshift 351-1637 351-1637 351-1637 351-1637 351-1637 351-1637
Component Locations
COMPONENT LOCATIONS
Tap
Number
Description
Schematic
Location
Tap Location
Pressure and Sampling
AA
BB
CC
DD
SOS
C-4
C-3
A-3
A-6
C-2
1A-6
2C-6
3E-5
4E-6
5E-4
6B-5
7A F-3
7B F-6
8A E-3
8B E-6
9E-4
10 E-5
11 E-5
12A B-5
12B C-8
13 C-1
14 B-6
15 D-5
16 C-6
17A C-3
17B E-2
18a B-4
19 C-2
20 C-2
21 C-6
22 A-3
23 C-4
24A D-2
24B E-2
25 C-8
26 C-7
27 D-6
28 F-1
29A F-6
29B F-8
30 F-4
31 A-6
32A A-3
32B A
-4
33A E-3
33B E-6
34A A-3
34B A-5
35 C-6
36 B-8
37A D-6
37B D-7
38 D-4
39 A-8
40 A-8
41 C-1
42 E-5
43 D-3
AABB
SOS
CC
12
345
6
8A
8B
9
1011
12A
12B
131415
16
17A
17B
18
19 20
21 22
24A
24B
262527
33A
33B
35
363940
42
DD
7A
7B
7A
7B
23
28
41
37B
37A
29B
29A
30
38
43
31
32A
32B
34A
34B
KENR8846-03 VOL 1 of 2
30 Page, (Dimensions: 39 inches x 28 inches)
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.
VOLUME 1 of 2: IMPLEMENT AND STEERING CIRCUITS
SCHEMATIC PART NUMBER: 339-3400, CHANGE: 00, VERSION: S
MEDIA NUMBER: KENR8846-03
THIS SCHEMATIC IS FOR THE 422E, 428E, 432E, 434E, 442E, AND 444E BACKHOE
LOADER HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
MAIN PUMP OUTPUT
LOAD SENSE CIRCUIT
BUCKET CONTROL CIRCUIT
LIFT CONTROL CIRCUIT
STEERING CIRCUIT
SUPPLY LINE
E-STICK CONTROL CIRCUIT
BOOM CONTROL CIRCUIT
STICK CONTROL CIRCUIT
DRAIN / RETURN LINE
RIGHT STABILIZER CONTROL CIRCUIT
LEFT STABILIZER CONTROL CIRCUIT
TILT CONTROL CIRCUIT
SWING CONTROL CIRCUIT
COUPLER CONTROL CIRCUIT
SIDESHIFT LOCK
A7
LS
P
T
T2 T1
P2 M
FRONT STEER CYL.
Ls
Ls
REAR STEER CYLINDER
T
M
P
D
DLS
STICK
A5B5
a5
BUCKET
A4B4
SWING
A3B3
BOOM
A2B2
a2
E-STICK
A6B6
STAB
B7
STAB
A1B1
R
L
P
LS
T
LIFT
A1
B1
TILT
A2
B2
AUX
A3
B3
COUPLER CYLINDER
T3
C
AWS ELECTRICAL
PRESSURE SWITCH
422E ONLY
(LOADER Ls RELIEF)
PISTON PUMP
(432E, 442E, 434E, 444E)
PISTON PUMP
(422E, 428E, 434E MECH)
422/428E
(NO FLUSHING VALVE)
STAB BOOM SWING BUCKET STICK E-STICK STAB
LIFT
TILT
AUX
428E
(SPOOL CONTROL LAYOUT)
422E/428E
(SPOOL CONTROL LAYOUT)
T
422E
(SPOOL CONTROL LAYOUT)
a2
b2
TILT
422E ONLY
(Ls CHECK)
ACC
R
T
PS
H
F1
F2
R2
R1
B
A
B
A
O
N
P
Q
A2
B2
P8
Ls
Ls
Pd
Pd
Sc
Sc
Cd
Cd
Ls8
T8
D
C
E
F
G
H
KL JM
A1
B1
A
B
Sc
Cd
Ls
Pd
PS
M
(27) VALVE GP
BANK 7 MECHANICAL
422E, 428E, 434E MECH: 316-9782
432E, 442E, 434E, 444E: 321-9975
(8B) CYLINDER GP
STABILIZER, RIGHT
320-5938
(4) CYLINDER GP
BOOM
422E, 428E, 434E MECH: 320-5936
432E, 434E: 320-6520
442E: 320-6522
444E: 321-9975
(10) CYLINDER GP
SWING, LEFT HAND
269-0381
(11) CYLINDER GP
SWING, RIGHT HAND
297-5556
(42) VALVE GP
PRESSURE CONTROL
320-7812
(3) CYLINDER GP
BACKHOE BUCKET
320-5937
(9) CYLINDER GP
STICK
422E, 428E, 434E MECH: 320-5932
432E, 434E: 320-6521
442E, 444E: 320-6523
(5) CYLINDER GP
E-STICK (OPT)
320-5935
(8A) CYLINDER GP
STABILIZER, LEFT
320-5938
(33A) VALVE GP
LOAD CONTROL
308-3437
(33B) VALVE GP
LOAD CONTROL
308-3437
(17B) PUMP GP
IMPLEMENT
422E, 428E: 296-6714
434E MECH: 345-7494
(17A) PUMP GP
IMPLEMENT
432E, 442E, 434E, 444E: 289-6370
(15) MANIFOLD GP
CONTROL
432E, 442E, 434E, 444E: 300-4491
(25) VALVE GP
BANK 2 MECHANICAL
422E: 323-1085
(12B) CYLINDER GP
TILT
422E: 206-3553
428E, 432E, 442E: 333-5427
434E MECH, 434E: 210-7101
444E: 214-9372
(26) VALVE GP
BANK 3 MECHANICAL
422E: 316-9785
428E, 434E MECH: 316-9784
432E, 442E, 434E, 444E: 321-9976
(31) VALVE GP
COUPLER
231-2615
(12A) CYLINDER GP
TILT
422E: 206-3553
428E, 432E, 442E: 333-5427
434E MECH, 434E: 210-7101
444E: 214-9372
(6) CYLINDER GP - LIFT
422E: 215-7298
428E, 432E, 442E: 320-5934
434E MECH, 434E (RH): 249-6711
434E MECH, 434E (LH): 249-6710
444E (RH): 249-6713
444E (LH): 249-6712
(21) SWITCH AS
PRESSURE RIDE CONTROL (OPT)
131-9203
422E: NOT USED
(2) ACCUMULATOR GP
RIDE CONTROL
345-3672
(16) MANIFOLD GP
RIDE CONTROL
245-8780
(18) PUMP GP
METERING STEERING LINES
325-2011
(23) VALVE AS
ALL WHEEL STEER
434E MECH, 434E, 444E: 340-7028
442E: 340-7208(OPT)
422E, 428E, 432E: NOT USED
(20) SWITCH AS
PRESSURE HYDRAULIC
OIL FILTER BYPASS
432E, 442E, 434E, 444E: 134-0404
422E, 428E, 434E MECH: NOT USED
(19) SENSOR GP
TEMPERATURE HYDRAULIC OIL
432E, 442E, 434E, 444E: 264-4297
422E, 428E, 434E MECH: NOT USED
(13) FILTER GP
OIL
325-6257
(22) TANK GP
245-8777
BB
SOS
CC
AA
Hydraulic System
Volume 2 of 2: Auxiliary Circuits, Brake Control, and Pilot Control
© 2012 Caterpillar, All Rights Reserved Printed in U.S.A.
KENR8846-03
September 2012
422E, 428E, 432E, 434E, 442E, and
444E Backhoe Loader
422E:
MAW1-UP
428E:
DPH1-UP
432E:
JBA1-UP
434E:
SEF1-UP
SJL1-UP
444E:
NBA1-UP
442E:
EME1-UP
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 PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-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
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
PT
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 MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR8846-03 VOL 1 of 2
30 Page, (Dimensions: 39 inches x 28 inches)
IMPLEMENT PUMP AND FILTER
(VIEWED FROM BOTTOM)
VALVE GP-BANK 7
(VIEWED FROM ABOVE)
Description 422E 428E 434E MECH 432E 442E 434E 444E
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic 149-0686 149-0686 149-0686 149-0686 149-0686
Accumulator Gp - Ride Control 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672
Cylinder Gp - Backhoe Bucket 320-5937 320-5937 320-5937 320-5937 320-5937 320-5937 320-5937
Cylinder Gp - Boom 320-5936 320-5936 320-5936 320-6520 320-6522 320-6520 320-6522
Cylinder Gp
- E-Stick (OPT) 320-5935 320-5935 320-5935 320-5935 320-5935 320-5935 320-5935
Cylinder Gp - Lift 215-7298 320-5934
249-6711 RH
249-6710 LH
320-5934 320-5934
249-6711 RH
249-6710 LH
249-6713 RH
249-6712 LH
Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223
Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223
Cylinder Gp - Stabilizer, Left 320-5938 320-5938 320-5938
320-5938 320-5938 320-5938 320-5938
Cylinder Gp - Stabilizer, Rightz 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938
Cylinder Gp - Stick 320-5932 320-5932 320-5932 320-6521 320-6523 320-6521 320-6523
Cylinder Gp - Swing, Left Hand 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381
Cylinder Gp - Swing, Right Hand 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556
Cylinder Gp - Tilt 206-3553 333-54
27 210-7101 333-5427 333-5427 210-7101 214-9372
Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372
Filter Gp - Oil 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257
Manifold and Solenoid Gp - Control 300-4493 300-4493 300-4493 300-4493
Manifold Gp - Control 300-4491 300-4491 300-4491 300-4491
Manifold Gp - Ride Control 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780
Pump Gp - Im
plement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370
Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370
Pump Gp - Metering (Steering Lines) 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011
Sensor Gp - Temperature (Hydraulic Oil) 264-4297 264-4297 264-4297 264-4297
Switch As - Press., Hydraulic Oil Filter Bypass 134-0404 134-0404 134-0404 134-0404
Switch As - Pressure,
Ride Control (OPT) 131-9203 131-9203 131-9203 131-9203 131-9203 131-9203
Tank Gp - 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777
Valve As - All Wheel Steer 340-7028 340-7028(OPT) 340-7028 340-7028
Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226
Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226
Valve Gp - Bank 2, Mechanical 323-1085
Valve Gp - Bank 3, Mechanical 316-978
5 316-9784 316-9784 321-9976 321-9976 321-9976 321-9976
Valve Gp - Bank 7, Mechanical 316-9782 316-9782 316-9782 321-9975 321-9975 321-9975 321-9975
Valve Gp - Brake Control, Unboosted 206-1769 206-1769
Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155
Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155
Valve Gp - Control, 9th Auxiliary 319-2158 319-2158 319-2158 319-2158
Valve Gp - Coupler 23
1-2615 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615
Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128
Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128
Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437
Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437
Valve Gp -
Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129
Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129
Valve Gp - Pilot (Backhoe) 347-2208 347-2208 347-2208 347-2208
Valve Gp - Pilot (Loader) 267-2760 267-2760 267-2760 267-2760
Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156
Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156
Valve Gp - Pi
lot, 9th Auxiliary 244-6735 244-6735 244-6735 244-6735
Valve Gp - Pilot, Stabilizer 297-4394 297-4394 297-4394 297-4394
Valve Gp - Pilot, Stabilizer (Alarm) 297-4395 297-4395 297-4395 297-4395
Valve Gp - Press. Redc, PRV (Brake) 344-1353
Valve Gp - Pressure Control 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812
Valve Gp - Sol., Powered Sideshift 351-1637 351-1637 351-1637 351-1637 351-1637 351-1637
Component Locations
COMPONENT LOCATIONS
System Pressure
Signal Pressure
Hydraulic Supply
Pilot Oil Pressure
Hydraulic Return Oil Sampling
Tap
Number
Description
Schematic
Location
Tap Location
Pressure and Sampling
1A-6
2C-6
3E-5
4E-6
5E-4
6B-5
7A F-3
7B F-6
8A E-3
8B E-6
9E-4
10 E-5
11 E-5
12A B-5
12B C-8
13 C-1
14 B-6
15 D-5
16 C-6
17A C-3
17B E-2
18a B-4
19 C-2
20 C-2
21 C-6
22 A-3
23 C-4
24A D-2
24B E-2
25 C-8
26 C-7
27 D-6
28 F-1
29A F-6
29B F-8
30 F-4
31 A-6
32A A-3
32B A-4
33A E-3
33B E-6
34A A-3
34B A-
5
35 C-6
36 B-8
37A D-6
37B D-7
38 D-4
39 A-8
40 A-8
41 C-1
42 E-5
43 D-3
AABB
SOS
CC
12
345
6
8A
8B
9
1011
12A
12B
131415
16
17A
17B
18
19 20
21 22
24A
24B
262527
33A
33B
35
363940
42
DD
7A
7B
7A
7B
23
28
41
37B
37A
29B
29A
30
38
43
31
32A
32B
34A
34B
AA
BB
CC
DD
SOS
C-4
C-3
A-3
A-6
C-2
KENR8846-03 VOL 2 of 2
30 Page, (Dimensions: 39 inches x 28 inches)
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.
VOLUME 2 of 2: AUXILIARY CIRCUITS, BRAKE CONTROL AND PILOT CONTROL
SCHEMATIC PART NUMBER: 339-3400, CHANGE: 00, VERSION: S
MEDIA NUMBER: KENR8846-03
THIS SCHEMATIC IS FOR THE 422E, 428E, 432E, 434E, 442E, AND 444E BACKHOE
LOADER HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
POWERED SIDESHIFT CIRCUIT
MAIN PUMP OUTPUT
LOAD SENSE CIRCUIT
BUCKET CONTROL CIRCUIT
LIFT CONTROL CIRCUIT
SUPPLY LINE
E-STICK CONTROL CIRCUIT
BRAKE CONTROL CIRCUIT
BOOM CONTROL CIRCUIT
STICK CONTROL CIRCUIT
DRAIN / RETURN LINE
RIGHT STABILIZER CONTROL CIRCUIT
8TH AUXILIARY CONTROL CIRCUIT
LEFT STABILIZER CONTROL CIRCUIT
TILT CONTROL CIRCUIT
SWING CONTROL CIRCUIT
COUPLER CONTROL CIRCUIT
9TH AUXILIARY CONTROL CIRCUIT
PILOT CONTROL CIRCUIT
8TH AUXILIARY AND POWERED SIDESHIFT
432E, 434E, 442E, 444E
LEFT RIGHT
STICK SWING
BOOM BUCKET
TILTLIFT
A4
TIN
ACC
P3
LEFT JOYSTICK
RIGHT JOYSTICK
T2
T3
P1
P1
P2 P2
T1
LOADER JOYSTICK
STABILIZER JOYSTICK
STICK (MECH)
T
P
P
V2
C2
BOOM (MECH)
T
V2
C2
PIL
BL
STICK (PILOT)
Pil
BL
C2
V2
BOOM (PILOT)
PSS
A1
B1
a5
8TH AUX
A2
B2
a5
T2
LS2
P2
LST
M
P
8TH AUXILIARY
432E, 434E, 442E, 444E
9TH AUXILIARY
432E, 434E, 442E, 444E
(ADDED AS AN ADDITONAL
SLICE TO 8TH AND POWERED
SIDESHIFT VALVE)
LS
C1
C2
P
T
BOOM
STICK
BOOM
TO REAR AXLE
LEFT WHEEL
BRAKE
TO REAR AXLE
RIGHT WHEEL
BRAKE
RIGHT BRAKE PEDAL
LEFT BRAKE PEDAL
P2
P3
P1
LEFT BRAKE PEDAL
RIGHT BRAKE PEDAL
TO REAR AXLE
LEFT WHEEL BRAKE
TO REAR AXLE
RIGHT WHEEL BRAKE
LEFT BRAKE PEDAL
RIGHT BRAKE PEDAL
TO REAR AXLE
LEFT WHEEL
BRAKE
TO REAR AXLE
RIGHT WHEEL BRAKE
P8
Ls8
T8
PSS
A1
B1
a5
8TH AUX
A2
B2
a5
T2
LS2
P2
LST
M
P
P8
Ls8
T8
9TH AUX
A2
B2
a5
C2
C1
P
T
T
P8
Ls8
T8
K
M
F
E
LJHG
NOQ P
DCB A
B2
T
A2
B1
A1
PS
BS
STICK
Pil
BL
C2
V2
T
PS
T
T
BS
POWERED SIDESHIFT BRAKES
PILOT CONTROL VALVES
428E HOSE BURST CHECK VALVES
BURST CHECK VALVES
432E, 434E, 442E, 444E
(29B) VALVE GP
CONTROL 8TH, AUXILIARY
432E, 442E, 434E, 444E: 319-2155
(37B) VALVE GP
PILOT 8TH, AUXILIARY
432E, 442E, 434E, 444E: 319-2156
(7B) CYLINDER GP
POWERED SIDESHIFT
432E, 442E, 434E, 444E: 347-2223
(29A) VALVE GP
CONTROL 8TH, AUXILIARY
432E, 442E, 434E, 444E: 319-2155
(37A) VALVE GP
PILOT 8TH, AUXILIARY
432E, 442E, 434E, 444E: 319-2156
(30) VALVE GP
CONTROL 9TH, AUXILIARY
432E, 442E, 434E, 444E: 319-2158
(38) VALVE GP
PILOT 9TH, AUXILIARY
432E, 442E, 434E, 444E: 244-6735
(7A) CYLINDER GP
POWERED SIDESHIFT
347-2223
422:NOT USED
(43) VALVE GP
SOLENOID POWERED SIDESHIFT
351-1637
422E: NOT USED
(28) VALVE GP
BRAKE CONTROL UNBOOSTED
422E, 428E:206-1769
(24B) VALVE GP
BRAKE BOOSTED
432E, 442E, 434E, 444E: 220-8226
(24A) VALVE GP
BRAKE BOOSTED
434E MECH: 220-8226
(41) VALVE GP
PRESSURE REDUCER PRV (BRAKE)
434E MECH: 344-1353
(35) VALVE GP
PILOT BACKHOE
432E, 442E, 434E, 444E: 347-2208
(36) VALVE GP
PILOT LOADER
432E, 442E, 434E, 444E: 267-2760
(39) VALVE GP
PILOT STABILIZER
432E, 442E, 434E, 444E: 297-4394
(40) VALVE GP
PILOT STABILIZER ALARM
432E, 442E, 434E, 444E: 297-4395
(1) ACCUMULATOR GP
HYDRAULIC
434E MECH,432E, 442E, 434E, 444E: 149-0686
(14) MANIFOLD AND SOLENOID GP
CONTROL
432E, 442E, 434E, 444E: 300-4493
(34B) VALVE GP
LOAD CONTROL STICK
428E, 434E MECH: 347-1128
(34A) VALVE GP
LOAD CONTROL STICK
432E, 442E, 434E, 444E: 347-1129
(32B) VALVE GP
LOAD CONTROL BOOM
428E, 434E MECH: 347-1126
(32A) VALVE GP
LOAD CONTROL BOOM
432E, 442E, 434E, 444E: 347-1128
DD
