Description
422E
428E
Accumulator Gp - Hydraulic
434E MECH
432E
442E
434E
444E
Machine Location
Schematic Location
149-0686
149-0686
149-0686
149-0686
149-0686
1
A-6
Tap Number AA
E-5
4
E-6
320-5935
320-5935
320-5935
5
E-4
DD
320-5934
320-5934
249-6711 RH 249-6710 LH
249-6713 RH 249-6712 LH
6
B-5
347-2223
347-2223
347-2223
347-2223
347-2223
7A
F-3
347-2223
347-2223
347-2223
347-2223
347-2223
7B
F-6
345-3672
Cylinder Gp - Backhoe Bucket
320-5937
320-5937
320-5937
320-5937
320-5937
Cylinder Gp - Boom
320-5936
320-5936
320-5936
320-6520
320-6522
Cylinder Gp - E-Stick (OPT)
320-5935
320-5935
320-5935
320-5935
Cylinder Gp - Lift
215-7298
320-5934
249-6711 RH 249-6710 LH
Cylinder Gp - Powered Sideshift
347-2223
Cylinder Gp - Powered Sideshift
347-2223
Cylinder Gp - Stabilizer, Left
320-5938
320-5938
320-5938
320-5938
320-5938
320-5938
320-5938
8A
E-3
Cylinder Gp - Stabilizer, Rightz
320-5938
320-5938
320-5938
320-5938
320-5938
320-5938
320-5938
8B
E-6
Cylinder Gp - Stick
320-5932
320-5932
320-5932
320-6521
320-6523
320-6521
320-6523
9
E-4
Cylinder Gp - Swing, Left Hand
269-0381
269-0381
269-0381
269-0381
269-0381
269-0381
269-0381
10
E-5
Cylinder Gp - Swing, Right Hand
297-5556
297-5556
297-5556
297-5556
297-5556
297-5556
297-5556
11
E-5
Cylinder Gp - Tilt
206-3553
333-5427
210-7101
333-5427
333-5427
210-7101
214-9372
12A
B-5
Cylinder Gp - Tilt
206-3553
333-5427
210-7101
333-5427
333-5427
210-7101
214-9372
12B
C-8
Filter Gp - Oil
325-6257
325-6257
325-6257
325-6257
325-6257
325-6257
325-6257
13
C-1
Manifold and Solenoid Gp - Control
300-4493
300-4493
300-4493
300-4493
14
B-6
Manifold Gp - Control
300-4491
300-4491
300-4491
300-4491
15
D-5
Manifold Gp - Ride Control
245-8780
245-8780
245-8780
245-8780
245-8780
245-8780
245-8780
16
C-6
Pump Gp - Implement
296-6714
296-6714
345-7494
345-7494
289-6370
289-6370
289-6370
17A
C-3 E-2
Pump Gp - Implement
296-6714
296-6714
345-7494
345-7494
289-6370
289-6370
289-6370
17B
Pump Gp - Metering (Steering Lines)
325-2011
325-2011
325-2011
325-2011
325-2011
325-2011
325-2011
18a
B-4
Sensor Gp - Temperature (Hydraulic Oil)
264-4297
264-4297
264-4297
264-4297
19
C-2
Switch As - Press., Hydraulic Oil Filter Bypass
134-0404
134-0404
134-0404
134-0404
20
C-2
131-9203
131-9203
131-9203
131-9203
131-9203
21
C-6
245-8777
245-8777
245-8777
Valve As - All Wheel Steer
340-7028
Valve As - Brake, Boosted
220-8226 220-8226
Valve As - Brake, Boosted Valve Gp - Bank 2, Mechanical
245-8777
245-8777
245-8777
22
A-3
340-7028(OPT)
340-7028
340-7028
23
C-4
220-8226
220-8226
220-8226
220-8226
24A
D-2
220-8226
220-8226
220-8226
220-8226
24B
E-2
25
C-8
323-1085
Valve Gp - Bank 3, Mechanical
316-9785
316-9784
316-9784
321-9976
321-9976
321-9976
321-9976
26
C-7
Valve Gp - Bank 7, Mechanical
316-9782
316-9782
316-9782
321-9975
321-9975
321-9975
321-9975
27
D-6
Valve Gp - Brake Control, Unboosted
206-1769
206-1769
28
F-1
Valve Gp - Control, 8th Auxiliary
319-2155
319-2155
319-2155
319-2155
29A
F-6
Valve Gp - Control, 8th Auxiliary
319-2155
319-2155
319-2155
319-2155
29B
F-8
Valve Gp - Control, 9th Auxiliary
319-2158
319-2158
319-2158
319-2158
30
F-4
Valve Gp - Coupler
231-2615
231-2615
231-2615
231-2615
231-2615
231-2615
231-2615
31
A-6
Valve Gp - Load Control, Boom
347-1126
347-1126
347-1128
347-1128
347-1128
347-1128
32A
A-3
Valve Gp - Load Control, Boom
347-1126
347-1126
347-1128
347-1128
347-1128
347-1128
32B
A-4
Valve Gp - Load Control, Stabilizer
308-3437
308-3437
308-3437
308-3437
308-3437
308-3437
308-3437
33A
E-3
Valve Gp - Load Control, Stabilizer
308-3437
308-3437
308-3437
308-3437
308-3437
308-3437
308-3437
33B
E-6 A-3
Valve Gp - Load Control, Stick
347-1128
347-1128
347-1129
347-1129
347-1129
347-1129
34A
Valve Gp - Load Control, Stick
347-1128
347-1128
347-1129
347-1129
347-1129
347-1129
34B
A-5
347-2208
347-2208
347-2208
347-2208
35
C-6
Valve Gp - Pilot (Backhoe) Valve Gp - Pilot (Loader)
267-2760
267-2760
267-2760
267-2760
36
B-8
Valve Gp - Pilot, 8th Auxiliary
319-2156
319-2156
319-2156
319-2156
37A
D-6
Valve Gp - Pilot, 8th Auxiliary
319-2156
319-2156
319-2156
319-2156
37B
D-7
Valve Gp - Pilot, 9th Auxiliary
244-6735
244-6735
244-6735
244-6735
38
D-4
Valve Gp - Pilot, Stabilizer
297-4394
297-4394
297-4394
297-4394
39
A-8
297-4395
297-4395
297-4395
297-4395
40
A-8
41
C-1
Valve Gp - Pilot, Stabilizer (Alarm) Valve Gp - Press. Redc, PRV (Brake) Valve Gp - Pressure Control Valve Gp - Sol., Powered Sideshift
344-1353 320-7812
A-3
3
320-6522
345-3672
245-8777
C-3
320-5937
320-6520
345-3672
Tank Gp -
Signal Pressure Hydraulic Supply Pilot Oil Pressure Hydraulic Return Oil Sampling
320-5937
345-3672
131-9203
BB CC
C-6
345-3672
Switch As - Pressure, Ride Control (OPT)
C-4
2
345-3672
320-7812
320-7812
320-7812
320-7812
320-7812
320-7812
42
E-5
351-1637
351-1637
351-1637
351-1637
351-1637
351-1637
43
D-3
Description
SOS
FLUID POWER SYMBOLS
Schematic Location
System Pressure
345-3672
Accumulator Gp - Ride Control
KENR8846-03 September 2012
Tap Location Pressure and Sampling
Component Locations
BASIC COMPONENT SYMBOLS MAIN
PUMP OR MOTOR
FLUID CONDITIONER
SPRING
CONTROL VALVES
VARIABILITY
SPRING (ADJUSTABLE)
LINE RESTRICTION (VARIABLE)
PRESSURE COMPENSATION
LINE RESTRICTION (FIXED)
A-6
AUX
PUMP (2 - SECTION)
PUMP (VARIABLE & PRESSURE COMPENSATED)
C-2
AA
ONE POSITION
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
TWO POSITION
ATTACHMENT
VALVE PORTS
THREE POSITION
TWO - WAY
THREE - WAY
CONTROL VALVES AB
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
VALVES
VALVE ENVELOPES
BB
RESTRICTION
FOUR - WAY
CHECK VALVES
A B
P T
P T
NORMAL POSITION
SHIFTED POSITION
BASIC SYMBOL
INFINITE POSITION
SPRING LOADED
SHUTTLE
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
PRESSURIZED
VENTED
422E, 428E, 432E, 434E, 442E, and 444E Backhoe Loader Hydraulic System 422E: MAW1-UP
428E: DPH1-UP
432E: JBA1-UP
434E: SEF1-UP SJL1-UP
442E: EME1-UP
444E: NBA1-UP
RETURN ABOVE FLUID LEVEL
PRESSURE
ROTATING SHAFTS
TEMPERATURE
FLOW
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
GENERAL MANUAL
MANUAL SHUTOFF
THERMAL
SPRING LOADED
DETENT
COMPLETE
FIXED DISPLACEMENT
SINGLE ACTING
LINES JOINING
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
LINES CROSSING
HYDRAULIC PUMPS
Volume 1 of 2: Implement and Steering Circuits
PEDAL
CROSSING & JOINING LINES
GAS CHARGED
FIXED DISPLACEMENT
PUSH BUTTON
INTERNAL RETURN
ACCUMULATORS
© 2012 Caterpillar, All Rights Reserved
SERVO
PILOT CONTROL SYMBOLS
EXTERNAL RETURN
IMPLEMENT PUMP AND FILTER (VIEWED FROM BOTTOM)
BIDIRECTIONAL
MANUAL CONTROL SYMBOLS
RELEASED PRESSURE
SOS
UNIDIRECTIONAL
COMBINATION CONTROLS
PUSH - PULL LEVER
CC
RETURN BELOW FLUID LEVEL
MEASUREMENT
INFINITE POSITIONING
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
2 POSITION
FLOW IN EITHER DIRECTION
Printed in U.S.A.
29A
9
4
8A 33A
7B
37A
30
17A 24B
42 37B 38 15 14 35
19
13
20 17B 28
ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)
18
G
M
TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
12A
6
12B
31
ELECTRICAL SYMBOLS (ELECTRICAL)
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” WIRE CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
CIRCUIT NUMBER IDENTIFICATION
WIRE COLOR
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD WIRE
WIRE COLOR
B
325-PK-14
CIRCUIT NUMBER IDENTIFICATION
DD 34A 32A
VALVE GP-BANK 7 (VIEWED FROM ABOVE)
34B 32B
11
10
7A 33B 8B
27
1
41
40 39 23 25 26
7B COMPONENT LOCATIONS
36
21
16
2
22
WIRE GAUGE
A
(EXAMPLE VALVE)
(Dimensions: 39 inches x 28 inches)
5
24A
30 Page,
3
43
KENR8846-03 VOL 1 of 2
7A
29B