UENR3238-01 November 2012
COMPONENT LOCATIONS
Pump GP - Implement
Part Number 307-3063
Machine Location 1
Schematic Location B-5
Tank - Hydraulic
358-9301
2
A-5
TANK GROUP - Filter/ Breather / Sight Gage
351-5888
3
A-5
Cooler - Hydraulic
337-9751
4
B-4
Filter - Hydraulic
361-6768
5
B-3
Valve HMU - Load Sense Relief
341-7654
6
C-6
Cylinder - Front Steer
217-5097
7
B-6
8
B-8
Description
13
14
16
LH 422F, 428F:
358-5034
RH 422F, 428F:
358-5035
422F:
358-5044
Cylinder - Lift
Cylinder - Tilt Cylinder - Tilt
358-5045
Cylinder - MP Bucket (OPT)
185-1839
11*
A-8
Cylinder - Stab Cylinder - Boom Cylinder - Stick
320-5938
12 13 14
F-6 F-6 F-4
15
F-5
16
F-4
Cylinder - Swing
RH:
381-8054
A-8 B-8
320-5937
Cylinder - E-Stick (OPT)
320-5935
17
F-3
Accumulator - Pilot
149-0686
18
D-5
Valve - Ride Control (OPT)
245-8780
19
C-8
Accumulator - Optional
20
C-8
21
C-8
Valve - Loader (ST)
422F: 428F: 422F:
382-8033 304-5696 344-7391 359-7203
26
C-7
Valve - Loader (PL/IT)
428F:
359-7209
27
C-7
Valve - Backhoe
359-7214
28
F-7
Valve - Cushion
320-7812
30
F-5
Valve - Check (Stab)
308-3437
31
F-6
Valve - Boosted Brake
220-8226
37
D-3
Manifold - Brake Valve GP - AWS
373-6966
38 39
D-5 A-5
422F, 428F:
N/A
MAIN
PUMP OR MOTOR
FLUID CONDITIONER
SPRING
CONTROL VALVES
VARIABILITY
SPRING (ADJUSTABLE)
LINE RESTRICTION (VARIABLE)
PRESSURE COMPENSATION
Valve - Boom Hose Burst
428F:
347-1126
40
F-6
Valve - Stick Hose Burst
428F:
347-1127
41
F-4
Valve - Lift Hose Burst
428F:
262-7081
42
B-8
Valve - Tilt Hose Burst
428F:
262-7079
43
B-8
Valve - Power Side Shift
428F:
351-1637
44*
B-2
Cylinder - Power Side Shift
428F:
347-2223
45*
B-3
Valve - Coupler (HOE)
358-2091
50*
A-3
Cylinder - Coupler (HOE)
361-1139
51*
B-3
TWO POSITION
P T
T1
2
RIGHT REAR SERVICE BRAKE (See Volume 3)
C-4
T3
REAR PARK BRAKES (See Volume 3)
D-5
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
ATTACHMENT
VALVE PORTS
TWO - WAY
THREE - WAY
FOUR - WAY
CHECK VALVES
SHIFTED POSITION
BASIC SYMBOL
INFINITE POSITION
SPRING LOADED
SHUTTLE
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
PRESSURIZED
422F and 428F Backhoe Loader Hydraulic System 422F: LRH1-UP
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
ROTATING SHAFTS
TEMPERATURE
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
428F: LBH1-UP SJW1-UP
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
SERVO
THERMAL
DETENT
MANUAL CONTROL SYMBOLS
PUSH - PULL LEVER
GENERAL MANUAL
MANUAL SHUTOFF
EXTERNAL RETURN
INTERNAL RETURN
© 2012 Caterpillar, All Rights Reserved
PEDAL
GAS CHARGED
SIMPLIFIED
LINES CROSSING
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
CROSSING & JOINING LINES
ACCUMULATORS
SPRING LOADED
PUSH BUTTON
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
Schematic Location C-5
PUMP DISCHARGE PRESSURE
PUMP (VARIABLE & PRESSURE COMPENSATED)
P T
NORMAL POSITION
TAP LOCATIONS Pressure, Sampling, Sensor
T2
AUX
PUMP (2 - SECTION)
A B
FIXED DISPLACEMENT
Description
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
THREE POSITION
HYDRAULIC PUMPS
Tap Number
LINE RESTRICTION (FIXED)
CONTROL VALVES AB
* COMPONENTS NOT SHOWN
REAR MACHINE VIEW
RESTRICTION
VALVES
VALVE ENVELOPES
VENTED
Cylinder - Bucket
Sensor - Ride Control (OPT)
15
LH:
320-5936 320-6521 381-8055
BASIC COMPONENT SYMBOLS
ONE POSITION
9 10
428F:
FLUID POWER SYMBOLS
INFINITE POSITIONING
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
2 POSITION
FLOW IN EITHER DIRECTION
Printed in U.S.A.
3
ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)
6 G
20 26 27
M
TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
21
41
7
40
18
9
4
ELECTRICAL SYMBOLS (ELECTRICAL)
31
T3 PRESSURE SWITCH
TEMPERATURE SWITCH
LEVEL SWITCH
FLOW SWITCH
WIRE NUMBER IDENTIFICATION CODES
42
37
HYDRAULIC SCHEMATIC EXAMPLE
CURRENT STANDARD
CURRENT STANDARD
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG”
8
T2
ELECTRICAL SCHEMATIC EXAMPLE
WIRE
12
T1
CIRCUIT NUMBER IDENTIFICATION
5
CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
WIRE COLOR
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD
39
WIRE
38
WIRE COLOR
B
325-PK-14
428F-434F FRONT VIEW
28
UNDER CAB VIEW 17
BOOM WITH E-STICK
422F FRONT
CIRCUIT NUMBER IDENTIFICATION
WIRE GAUGE
A
(EXAMPLE VALVE)
30 Page,
10
19
UENR3238-01
43
(Dimensions: 39 inches x 28 inches)
1