dph
4
Hydraulic System 444E Backhoe Loader 422E: MAW1-UP Volume 1 of 2: Implement and Steering Circuits © 2011 Caterpillar, All Rights Reserved Printed in U.S.A. KENR8846-01 January 2011 422E, 428E, 432E, 434E, 442E, and 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 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 KENR8846-01 VOL 1 of 2 30 Page, (Dimensions: 39 inches x 28 inches) 1 A-6 2 C-6 3 E-5 4 E-6 5 E-4 6 B-5 7A F-3 7B F-6 8A E-3 8B E-6 9 E-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 AA BB SOS CC AA C-4 BB C-3 CC A-3 DD A-6 SOS C-2 1 2 3 4 5 6 8A 8B 9 10 11 12A 12B 13 14 15 16 17A 17B 18 19 20 21 22 24A 24B 26 25 27 33A 33B 35 36 39 40 42 DD 7A 7B 7A 7B 23 28 41 37B 37A 29B 29A 30 38 43 31 32A 32B 34A 34B IMPLEMENT PUMP AND FILTER (VIEWED FROM BOTTOM) Tap Number Description Schematic Location System Pressure Signal Pressure Hydraulic Supply Pilot Oil Pressure Hydraulic Return Oil Sampling Tap Locations Pressure and 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 320-5937 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 333-5427 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 300-4491 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 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 316-9785 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 319-2155 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 319-2156 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 Valve Gp - Sol., Powered Sideshift 351-1637 351-1637 351-1637 351-1637 351-1637 351-1637 Component Locations COMPONENT LOCATIONS
-
Upload
bleoju-andrei -
Category
Documents
-
view
299 -
download
9
description
CAT 428E2 Backhoe loader hydraulic diagram
Transcript of dph
Hydraulic System444E Backhoe Loader
422E:MAW1-UP
Volume 1 of 2: Implement and Steering Circuits
© 2011 Caterpillar, All Rights Reserved Printed in U.S.A.
KENR8846-01January 2011
422E, 428E, 432E, 434E, 442E, and
428E:DPH1-UP
432E:JBA1-UP
434E:SEF1-UPSJL1-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)
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
KE
NR
8846-0
1 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)
1 A-62 C-63 E-54 E-65 E-4
6 B-5
7A F-37B F-6 8A E-38B E-69 E-410 E-511 E-5
12A B-512B C-813 C-114 B-615 D-516 C-6
17A C-317B E-218a B-419 C-220 C-221 C-622 A-323 C-4
24A D-224B E-225 C-826 C-727 D-628 F-1
29A F-629B F-830 F-4 31 A-6
32A A-332B A-433A E-333B E-634A A-334B A-535 C-6 36 B-8
37A D-637B D-738 D-4 39 A-840 A-841 C-142 E-543 D-3
AABB
SOSCC
AA C-4BB C-3CC A-3DD A-6
SOS C-2
1 2
3 45
6
8A
8B
9
1011
12A
12B
131415
16
17A
17B 1819 20
21 22
24A
24B
262527
33A
33B
35
363940
42
DD
7A7B
7A7B
23
28
41
37B
37A
29B
29A
3038
43
31
32A
32B
34A
34B
IMPLEMENT PUMP AND FILTER(VIEWED FROM BOTTOM)
TapNumber Description Schematic
LocationSystem PressureSignal PressureHydraulic Supply Pilot Oil Pressure Hydraulic Return Oil Sampling
Tap LocationsPressure and Sampling
VALVE GP-BANK 7(VIEWED FROM ABOVE)
Description 422E 428E 434E MECH 432E 442E 434E 444E MachineLocation
SchematicLocation
Accumulator Gp - Hydraulic 149-0686 149-0686 149-0686 149-0686 149-0686Accumulator Gp - Ride Control 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672Cylinder Gp - Backhoe Bucket 320-5937 320-5937 320-5937 320-5937 320-5937 320-5937 320-5937Cylinder Gp - Boom 320-5936 320-5936 320-5936 320-6520 320-6522 320-6520 320-6522Cylinder 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 RH249-6710 LH 320-5934 320-5934 249-6711 RH
249-6710 LH249-6713 RH249-6712 LH
Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223Cylinder Gp - Stabilizer, Left 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938Cylinder Gp - Stabilizer, Rightz 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938Cylinder Gp - Stick 320-5932 320-5932 320-5932 320-6521 320-6523 320-6521 320-6523Cylinder Gp - Swing, Left Hand 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381Cylinder Gp - Swing, Right Hand 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372Filter Gp - Oil 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257Manifold and Solenoid Gp - Control 300-4493 300-4493 300-4493 300-4493Manifold Gp - Control 300-4491 300-4491 300-4491 300-4491Manifold Gp - Ride Control 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370Pump Gp - Metering (Steering Lines) 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011Sensor Gp - Temperature (Hydraulic Oil) 264-4297 264-4297 264-4297 264-4297Switch As - Press., Hydraulic Oil Filter Bypass 134-0404 134-0404 134-0404 134-0404Switch As - Pressure, Ride Control (OPT) 131-9203 131-9203 131-9203 131-9203 131-9203 131-9203Tank Gp - 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777Valve As - All Wheel Steer 340-7028 340-7028(OPT) 340-7028 340-7028Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226Valve Gp - Bank 2, Mechanical 323-1085Valve Gp - Bank 3, Mechanical 316-9785 316-9784 316-9784 321-9976 321-9976 321-9976 321-9976Valve Gp - Bank 7, Mechanical 316-9782 316-9782 316-9782 321-9975 321-9975 321-9975 321-9975Valve Gp - Brake Control, Unboosted 206-1769 206-1769Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155Valve Gp - Control, 9th Auxiliary 319-2158 319-2158 319-2158 319-2158Valve Gp - Coupler 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129Valve Gp - Pilot (Backhoe) 347-2208 347-2208 347-2208 347-2208Valve Gp - Pilot (Loader) 267-2760 267-2760 267-2760 267-2760Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156Valve Gp - Pilot, 9th Auxiliary 244-6735 244-6735 244-6735 244-6735Valve Gp - Pilot, Stabilizer 297-4394 297-4394 297-4394 297-4394Valve Gp - Pilot, Stabilizer (Alarm) 297-4395 297-4395 297-4395 297-4395Valve Gp - Press. Redc, PRV (Brake) 344-1353Valve Gp - Pressure Control 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812Valve Gp - Sol., Powered Sideshift 351-1637 351-1637 351-1637 351-1637 351-1637 351-1637
Component Locations
COMPONENT LOCATIONS
KE
NR
8846-0
1 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)
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)
ComponentName
Part Number
Attachment Group
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSPOWERED SIDESHIFT CIRCUITMAIN PUMP OUTPUTLOAD SENSE CIRCUITBUCKET CONTROL CIRCUITLIFT CONTROL CIRCUITSTEERING CIRCUITSUPPLY LINEE-STICK CONTROL CIRCUITBRAKE CONTROL CIRCUITBOOM CONTROL CIRCUITSTICK CONTROL CIRCUITDRAIN / RETURN LINERIGHT STABILIZER CONTROL CIRCUIT8TH AUXILIARY CONTROL CIRCUIT
LEFT STABILIZER CONTROL CIRCUITTILT CONTROL CIRCUITSWING CONTROL CIRCUITCOUPLER CONTROL CIRCUIT
9TH AUXILIARY CONTROL CIRCUIT
PILOT CONTROL CIRCUIT
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.
THIS SCHEMATIC IS FOR THE 422E, 428E, 432E, 434E, 442E, AND 444E BACKHOEVOLUME 1 of 2: IMPLEMENT AND STEERING CIRCUITS PART NUMBER: 339-3400, CHANGE: 00, VERSION: S
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
SIDESHIFT LOCK
A7
LS
P
T
T2 T1
P2 M
FRONT STEER CYL.
Ls
Ls
REAR STEER CYLINDERT MP
D
DLS
STICKA5B5
a5
BUCKETA4B4
SWINGA3B3
BOOMA2B2
a2
E-STICKA6B6
STAB
B7
STABA1B1
RL
PLST
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
F1F2R2
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
K L J M
A1
B1
A
B
Sc Cd
Ls
Pd
PS
M
(27) VALVE GP - BANK 7MECHANICAL422E, 428E, 434E MECH: 316-9782432E, 442E, 434E, 444E: 321-9975
(8B) CYLINDER GP - STABILIZER, RIGHT320-5938
(4) CYLINDER GP - BOOM422E, 428E, 434E MECH: 320-5936432E, 434E: 320-6520442E: 320-6522, 444E: 321-9975
(10) CYLINDER GP SWING, LEFT HAND269-0381
(11) CYLINDER GP SWING, RIGHT HAND297-5556
(42) VALVE GP - PRESSURE CONTROL 320-7812
(3) CYLINDER GP -BACKHOE BUCKET320-5937
(9) CYLINDER GP - STICK 422E, 428E, 434E MECH: 320-5932432E, 434E: 320-6521442E, 444E: 320-6523
(5) CYLINDER GP - E-STICK(OPT)320-5935
(8A) CYLINDER GP - STABILIZER, LEFT320-5938
(33A) VALVE GP - LOAD CONTROL 308-3437
(33B) VALVE GP - LOAD CONTROL 308-3437
(17B) PUMP GP - IMPLEMENT422E, 428E: 296-6714434E MECH: 345-7494
(17A) PUMP GP - IMPLEMENT432E, 442E, 434E, 444E: 289-6370
(15) MANIFOLD GP - CONTROL432E, 442E, 434E, 444E: 300-4491
(25) VALVE GP - BANK 2MECHANICAL422E: 323-1085
(12B) CYLINDER GP - TILT422E: 206-3553428E, 432E, 442E: 333-5427434E MECH, 434E: 210-7101444E: 214-9372
(26) VALVE GP - BANK 3MECHANICAL422E: 316-9785428E, 434E MECH: 316-9784432E, 442E, 434E, 444E: 321-9976
(31) VALVE GP - COUPLER231-2615
(12A) CYLINDER GP - TILT422E: 206-3553428E, 432E, 442E: 333-5427434E MECH, 434E: 210-7101444E: 214-9372
(6) CYLINDER GP - LIFT422E: 215-7298428E, 432E, 442E: 320-5934434E MECH, 434E (RH): 249-6711434E MECH, 434E (LH): 249-6710444E (RH): 249-6713444E (LH): 249-6712(21) SWITCH AS - PRESSURE
RIDE CONTROL (OPT)131-9203422E: NOT USED
(2) ACCUMULATOR GP - RIDE CONTROL 345-3672
(16) MANIFOLD GP - RIDE CONTROL 245-8780
(18) PUMP GP - METERINGSTEERING LINES325-2011
(23) VALVE AS - ALL WHEEL STEER434E MECH, 434E, 444E: 340-7028442E: 340-7208(OPT)422E, 428E, 432E: NOT USED
(20) SWITCH AS - PRESSUREHYDRAULIC OIL FILTER BYPASS432E, 442E, 434E, 444E: 134-0404422E, 428E, 434E MECH: NOT USED
(19) SENSOR GP - TEMPERATUREHYDRAULIC OIL 432E, 442E, 434E, 444E: 264-4297422E, 428E, 434E MECH: NOT USED
(13) FILTER GP - OIL325-6257
(22) TANK GP245-8777
BB
SOS
CC
AA
Hydraulic System444E Backhoe Loader
Volume 2 of 2: Auxiliary Circuits, Brake Control, and Pilot Control
© 2011 Caterpillar, All Rights Reserved Printed in U.S.A.
KENR8846-01January 2011
422E, 428E, 432E, 434E, 442E, and
422E:MAW1-UP
428E:DPH1-UP
432E:JBA1-UP
434E:SEF1-UPSJL1-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)
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
KE
NR
8846-0
1 V
OL
2 o
f 2
30
Pa
ge
, (D
ime
ns
ion
s:
39
in
ch
es
x 2
8 i
nc
he
s)
1 A-62 C-63 E-54 E-65 E-4
6 B-5
7A F-37B F-6 8A E-38B E-69 E-410 E-511 E-5
12A B-512B C-813 C-114 B-615 D-516 C-6
17A C-317B E-218a B-419 C-220 C-221 C-622 A-323 C-4
24A D-224B E-225 C-826 C-727 D-628 F-1
29A F-629B F-830 F-4 31 A-6
32A A-332B A-433A E-333B E-634A A-334B A-535 C-6 36 B-8
37A D-637B D-738 D-4 39 A-840 A-841 C-142 E-543 D-3
AABB
SOSCC
AA C-4BB C-3CC A-3DD A-6
SOS C-2
1 2
3 45
6
8A
8B
9
1011
12A
12B
131415
16
17A
17B 1819 20
21 22
24A
24B
262527
33A
33B
35
363940
42
DD
7A7B
7A7B
23
28
41
37B
37A
29B
29A
3038
43
31
32A
32B
34A
34B
IMPLEMENT PUMP AND FILTER(VIEWED FROM BOTTOM)
VALVE GP-BANK 7(VIEWED FROM ABOVE)
Description 422E 428E 434E MECH 432E 442E 434E 444E MachineLocation
SchematicLocation
Accumulator Gp - Hydraulic 149-0686 149-0686 149-0686 149-0686 149-0686Accumulator Gp - Ride Control 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672 345-3672Cylinder Gp - Backhoe Bucket 320-5937 320-5937 320-5937 320-5937 320-5937 320-5937 320-5937Cylinder Gp - Boom 320-5936 320-5936 320-5936 320-6520 320-6522 320-6520 320-6522Cylinder 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 RH249-6710 LH 320-5934 320-5934 249-6711 RH
249-6710 LH249-6713 RH249-6712 LH
Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223Cylinder Gp - Powered Sideshift 347-2223 347-2223 347-2223 347-2223 347-2223 347-2223Cylinder Gp - Stabilizer, Left 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938Cylinder Gp - Stabilizer, Rightz 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938 320-5938Cylinder Gp - Stick 320-5932 320-5932 320-5932 320-6521 320-6523 320-6521 320-6523Cylinder Gp - Swing, Left Hand 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381 269-0381Cylinder Gp - Swing, Right Hand 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556 297-5556Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372Cylinder Gp - Tilt 206-3553 333-5427 210-7101 333-5427 333-5427 210-7101 214-9372Filter Gp - Oil 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257 325-6257Manifold and Solenoid Gp - Control 300-4493 300-4493 300-4493 300-4493Manifold Gp - Control 300-4491 300-4491 300-4491 300-4491Manifold Gp - Ride Control 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780 245-8780Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370Pump Gp - Implement 296-6714 296-6714 345-7494 345-7494 289-6370 289-6370 289-6370Pump Gp - Metering (Steering Lines) 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011 325-2011Sensor Gp - Temperature (Hydraulic Oil) 264-4297 264-4297 264-4297 264-4297Switch As - Press., Hydraulic Oil Filter Bypass 134-0404 134-0404 134-0404 134-0404Switch As - Pressure, Ride Control (OPT) 131-9203 131-9203 131-9203 131-9203 131-9203 131-9203Tank Gp - 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777 245-8777Valve As - All Wheel Steer 340-7028 340-7028(OPT) 340-7028 340-7028Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226Valve As - Brake, Boosted 220-8226 220-8226 220-8226 220-8226 220-8226Valve Gp - Bank 2, Mechanical 323-1085Valve Gp - Bank 3, Mechanical 316-9785 316-9784 316-9784 321-9976 321-9976 321-9976 321-9976Valve Gp - Bank 7, Mechanical 316-9782 316-9782 316-9782 321-9975 321-9975 321-9975 321-9975Valve Gp - Brake Control, Unboosted 206-1769 206-1769Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155Valve Gp - Control, 8th Auxiliary 319-2155 319-2155 319-2155 319-2155Valve Gp - Control, 9th Auxiliary 319-2158 319-2158 319-2158 319-2158Valve Gp - Coupler 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615 231-2615Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128Valve Gp - Load Control, Boom 347-1126 347-1126 347-1128 347-1128 347-1128 347-1128Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437Valve Gp - Load Control, Stabilizer 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437 308-3437Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129Valve Gp - Load Control, Stick 347-1128 347-1128 347-1129 347-1129 347-1129 347-1129Valve Gp - Pilot (Backhoe) 347-2208 347-2208 347-2208 347-2208Valve Gp - Pilot (Loader) 267-2760 267-2760 267-2760 267-2760Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156Valve Gp - Pilot, 8th Auxiliary 319-2156 319-2156 319-2156 319-2156Valve Gp - Pilot, 9th Auxiliary 244-6735 244-6735 244-6735 244-6735Valve Gp - Pilot, Stabilizer 297-4394 297-4394 297-4394 297-4394Valve Gp - Pilot, Stabilizer (Alarm) 297-4395 297-4395 297-4395 297-4395Valve Gp - Press. Redc, PRV (Brake) 344-1353Valve Gp - Pressure Control 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812 320-7812Valve Gp - Sol., Powered Sideshift 351-1637 351-1637 351-1637 351-1637 351-1637 351-1637
Component Locations
COMPONENT LOCATIONS
TapNumber Description Schematic
LocationSystem PressureSignal PressureHydraulic Supply Pilot Oil Pressure Hydraulic Return Oil Sampling
Tap LocationsPressure and Sampling
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)YY
(52) VALVE GP - CONTROL138-1234
Callout Number(Machine Location from
Component LocationsTable)
ComponentName
Part Number
Attachment Group
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSPOWERED SIDESHIFT CIRCUITMAIN PUMP OUTPUTLOAD SENSE CIRCUITBUCKET CONTROL CIRCUITLIFT CONTROL CIRCUITSTEERING CIRCUITSUPPLY LINEE-STICK CONTROL CIRCUITBRAKE CONTROL CIRCUITBOOM CONTROL CIRCUITSTICK CONTROL CIRCUITDRAIN / RETURN LINERIGHT STABILIZER CONTROL CIRCUIT8TH AUXILIARY CONTROL CIRCUIT
LEFT STABILIZER CONTROL CIRCUITTILT CONTROL CIRCUITSWING CONTROL CIRCUITCOUPLER CONTROL CIRCUIT
9TH AUXILIARY CONTROL CIRCUIT
PILOT CONTROL CIRCUIT
KE
NR
8846-0
1 V
OL
2 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.
THIS SCHEMATIC IS FOR THE 422E, 428E, 432E, 434E, 442E, AND 444E BACKHOEVOLUME 2 of 2: PILOT, AUXILIARY, AND BRAKE PART NUMBER: 339-3400, CHANGE: 00, VERSION: S
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
LEFT RIGHT
STICK SWING BOOM BUCKET
TILTLIFT
A4
TIN
ACC
P3
LEFT JOYSTICK RIGHT JOYSTICK
T2
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)
PilBL
C2
V2
BOOM (PILOT)
PSS
A1B1
a5
8TH AUX
A2B2
a5
T2
LS2
P2
LST M P
8TH AUXILIARY432E, 434E, 442E, 444E
9TH AUXILIARY432E, 434E, 442E, 444E
(ADDED AS AN ADDITONAL SLICE TO 8TH AND POWERED
SIDESHIFT VALVE)
LS
C1 C2
P
T
BOOM STICKBOOM
TO REAR AXLELEFT WHEELBRAKE
TO REAR AXLERIGHT WHEELBRAKE
RIGHT BRAKE PEDAL
LEFT BRAKE PEDAL
P2 P3
P1
LEFT BRAKE PEDAL
RIGHT BRAKE PEDAL
TO REAR AXLELEFT WHEEL BRAKE
TO REAR AXLERIGHT WHEEL BRAKE
LEFT BRAKE PEDAL
RIGHT BRAKE PEDAL
TO REAR AXLELEFT WHEELBRAKE
TO REAR AXLERIGHT WHEEL BRAKE
P8Ls8T8
PSS
A1B1
a5
8TH AUX
A2B2
a5
T2
LS2
P2
LST M P
P8Ls8
T8
9TH AUX
A2B2
a5
C2C1
P
T T
P8
Ls8
T8
K M F E L J H G
N O Q P
D C B A
B2
A2
B1
A1
PS
BS
STICK
PilBL
C2
V2
TPS
T
T
BS
8TH AUXILIARY AND POWERED SIDESHIFT432E, 434E, 442E, 444E POWERED SIDESHIFT BRAKES
PILOT CONTROL VALVES
428E HOSE BURST CHECK VALVESBURST CHECK VALVES432E, 434E, 442E, 444E
(29B) VALVE GP - CONTROL8TH, AUXILIARY432E, 442E, 434E, 444E: 319-2155
(37B) VALVE GP - PILOT8TH, AUXILIARY432E, 442E, 434E, 444E: 319-2156
(7B) CYLINDER GP - POWERED SIDESHIFT432E, 442E, 434E, 444E: 347-2223
(29A) VALVE GP - CONTROL8TH, AUXILIARY432E, 442E, 434E, 444E: 319-2155
(37A) VALVE GP - PILOT8TH, AUXILIARY432E, 442E, 434E, 444E: 319-2156
(30) VALVE GP - CONTROL9TH, AUXILIARY432E, 442E, 434E, 444E: 319-2158
(38) VALVE GP - PILOT9TH, AUXILIARY432E, 442E, 434E, 444E: 244-6735
(7A) CYLINDER GP - POWERED SIDESHIFT347-2223422:NOT USED
(43) VALVE GP - SOLENOIDPOWERED SIDESHIFT351-1637422E: NOT USED
(28) VALVE GP - BRAKE CONTROLUNBOOSTED422E, 428E:206-1769
(24B) VALVE GP - BRAKEBOOSTED432E, 442E, 434E, 444E: 220-8226
(24A) VALVE GP - BRAKEBOOSTED434E MECH: 220-8226
(41) VALVE GP - PRESSURE REDUCERPRV (BRAKE)434E MECH: 344-1353
(35) VALVE GP - PILOTBACKHOE432E, 442E, 434E, 444E: 347-2208
(36) VALVE GP - PILOTLOADER432E, 442E, 434E, 444E: 267-2760
(39) VALVE GP - PILOTSTABILIZER432E, 442E, 434E, 444E: 297-4394
(40) VALVE GP - PILOTSTABILIZER ALARM432E, 442E, 434E, 444E: 297-4395
(1) ACCUMULATOR GP - HYDRAULIC 434E MECH,432E, 442E, 434E, 444E: 149-0686
(14) MANIFOLD AND SOLENOID GPCONTROL432E, 442E, 434E, 444E: 300-4493
(34B) VALVE GP - LOAD CONTROLSTICK428E, 434E MECH: 347-1128
(34A) VALVE GP - LOAD CONTROLSTICK432E, 442E, 434E, 444E: 347-1129
(32B) VALVE GP - LOAD CONTROLBOOM428E, 434E MECH: 347-1126
(32A) VALVE GP - LOAD CONTROLBOOM432E, 442E, 434E, 444E: 347-1128
DD
