RENR7783-02 August 2010
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN
Component Locations (Volume 1)
149-0686
1
G-6
Cartridge - P.O. Check
213-4072
2
C-3 , C-7
Connector - Orifice (Loader Valve)
220-8219
3
E-9
Connector - Orifice ( Left Hand Joystick)
164-9639
4
B-7
Connector - Orifice (Switching Valve)
220-8219
5
A-6 B-15
Cooler - Radiator
235-1974
6
Cover - End
191-4010
7
I-9
Cover - End (Backhoe Valve)
6E-4158
8
C-1
Cover Gp - Inlet
211-0180
9
C-9
Cylinder - Boom
206-3630
10
D-8
Cylinder - Bucket
191-7835
11
D-4
Cylinder - Lift (ST)
230-0980
12
G-11
Cylinder - Stabilizer (Left)
228-3499
13
H-4
Cylinder - Stabilizer (Right)
228-3500
14
H-2
Cylinder - Steer
167-4325
15
E-13 D-3
Cylinder - Stick
235-9829
16
Cylinder - Swing
228-3506
17
D-6
Cylinder - Tilt (ST)
200-7128
18
H-11
Filter
210-6243
19
G-13
Hand Metering Unit (HMU)
238-8550
20
D-14
Manifold - Return
186-3629
21
F-7
Pump Gp
244-2228
22
B-13
Tank Gp - Hydraulic
240-9721
23
B-14
Valve - Backhoe
201-0665
25
C-1
Valve - Boom
201-0668
26
C-7
Valve - Bucket
201-5358
27
C-4
Valve - Check
214-3524
28
C-10
Valve - Lift
130-6520
29
F-10
Valve - Line Relief (Boom)
187-0523
30
C-8 C-8
Valve - Line Relief (Boom)
6E-6285
31
Valve - Line Relief (Bucket)
187-0524
32
C-5
Valve - Line Relief (Bucket)
187-0527
33
C-5
Valve - Line Relief (Stick)
187-0529
34
C-3
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
Valve - Stabilizer
192-0827
39
G-1, G-5
Valve - Steer Priority
188-7471
40
E-10
Valve - Stick
201-0669
41
C-3
Valve - Swing
201-5357
42
C-6
Valve - Tilt
201-5377
43
G-10
Valve - Tilt Down Pressure Limiter
210-6171
44
G-10
Valve Gp - 2 Bank Loader
200-7827
45
E-9
Valve Gp - Cushion Relief
206-3685
46
D-5
Valve Gp - P.C.F.R.
212-0732
47
C-9
Valve Gp - Pilot / Left Hand Joystick
185-5916
48
A-8
Valve Gp - Pilot / Right Hand Joystick
185-5915
49
A-3
Valve Gp - Pilot Shut Off
233-7132
50
F-7
Valve Gp - P-Lever 2 Bank/Detents/SW
185-5900
51
G-7
Valve Gp - Pressure Reducing
239-2226
52
F-6
Valve Gp - Stabilizer (2 Bank RE-Relief)
185-5898
53
G-1
Switch - Differential Pressure
134-0404
54
G-13
16
2A 11
20
23
191-7725
1A
C-2
Cylinder - E-Stick Bucket
191-7839
2A
D-4
Cylinder - MP Bucket
185-1839
3A
I-13
Valve - Auxiliary (Backhoe Valve)
190-3450
4A
C-8
Valve - Auxiliary (Loader Valve)
124-8818
5A
H-10
Valve - Backhoe (5 Bank)
201-0666
7A
C-1
Valve - Backhoe (6 Bank)
201-0667
9A
C-1
Valve - E-Stick
201-0664
10A
C-1
Valve - Line Relief (Aux Loader Valve)
9T-0704
11A
I-9
Valve - Line Relief (E-Stick)
132-5303
12A
C-2
Valve - Pressure Controller (E-Stick)
211-3539
13A
C-2
Valve - Switching
164-2274
14A
A-6
200-7828
15A
E-9
162-3960
1B
D-12
Switch - Pressure
131-9203
2B
C-11
Valve Gp - Ride Control
243-2266
3B
D-12
LINE RESTRICTION (VARIABLE)
PRESSURE COMPENSATION
LINE RESTRICTION (FIXED)
1A
BB
Pump Signal Pressure Test Port
B-12
Pilot Pressure Test Port
G-6
420D Backhoe Loader (BMC)
SEBP3584
432D Backhoe Loader (WEP & TDR)
SEBP3971
442D Backhoe Loader (TBD & SMJ)
SEBP3967
THREE - WAY
FOUR - WAY
P T BASIC SYMBOL
INFINITE POSITION
SPRING LOADED
SHUTTLE
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
420D, 432D and 442D Backhoe Loader Hydraulic System 420D: BKC1-UP BMC1-UP
PRESSURIZED
432D: WEP1-UP TDR1-UP
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
ROTATING SHAFTS
TEMPERATURE
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
442D: TBD1-UP SMJ1-UP
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
SERVO
THERMAL
DETENT
MANUAL CONTROL SYMBOLS
10 PUSH - PULL LEVER
GENERAL MANUAL
MANUAL SHUTOFF
2 4A 5 7A 8
17
EXTERNAL RETURN
9 9A 10A 12A 13A
14A
25 26 27 28 30 14 39
13
31 32 33 34 35
1B 2B 3B
4 49
51
1
INTERNAL RETURN
PEDAL
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
CROSSING & JOINING LINES
ACCUMULATORS
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
48 19 22 54
15
12 44
3A SPRING LOADED
52 53
36 41 42 46 47
PUSH BUTTON
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
21 50
3 5A 7
GAS CHARGED
LINES CROSSING
SINGLE ACTING
LINES JOINING
HYDRAULIC MOTORS
HYDRAULIC PUMPS
DOUBLE ACTING
INTERNAL PASSAGEWAYS
11A 15A FIXED DISPLACEMENT
29 37 38 40 43 45
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT NON-COMPENSATED
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
Volume 1 of 2: Single Tilt Loader With Center Pivot Backhoe
INFINITE POSITIONING
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
RENR7778
Testing and Adjusting: (Hydraulic & Steering System)
RENR7779
Specifications: (Axles, Differentials & Brakes)
RENR7776
Testing and Adjusting: (Axles, Differentials & Brakes)
RENR7777
ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)
19 43
5A
47
G
29 40 22
22. 19. 45. BB.
M
TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
50
ELECTRICAL SYMBOLS (ELECTRICAL)
Hydraulic Pump Filter Loader Valve Group Signal Pressure Test Port
AA
22
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).
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).
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”
LOADER VALVE GROUP
PILOT SHUT OFF VALVE
WIRE CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
Electrical System
WIRE COLOR
RENR7781
Schematic: (Electrical system)
FLOW IN EITHER DIRECTION
Printed in U.S.A.
Machine System Specifications: (Hydraulic & Steering System)
2 POSITION
MACHINE COMPONENT LOCATIONS
Media Number SEBP3583
TWO - WAY
CHECK VALVES
SHIFTED POSITION
VENTED
Related Manuals
420D Backhoe Loader (BKC)
VALVE PORTS
THREE POSITION
6
Schematic Location
CC
ATTACHMENT
A B
P T
Tap Locations (Volume 1) Pressure, Sampling, and Sensor
A-12
PUMP (VARIABLE & PRESSURE COMPENSATED)
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
VALVES
TWO POSITION
NORMAL POSITION
45
Pump Pressure Test Port
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
PUMP (2 - SECTION)
18
BB
Description Parts Manual
SPRING (ADJUSTABLE)
RESTRICTION
CONTROL VALVES
21
Accumulator - Ride Control
AA
VARIABILITY
AB
Ride Control
Description
CONTROL VALVES
ONE POSITION
© 2010 Caterpillar, All Rights Reserved
Cylinder - E-Stick
Tap Number
SPRING
VALVE ENVELOPES
Attachments
Valve Gp - 3 Bank Loader
FLUID CONDITIONER
CIRCUIT NUMBER IDENTIFICATION
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD WIRE COLOR
WIRE
22. Hydraulic Pump AA. Pump Pressure Test Port
B
325-PK-14
Sight Gauge
HYDRAULIC PUMP
CIRCUIT NUMBER IDENTIFICATION
25 10A
WIRE GAUGE
(EXAMPLE VALVE)
23 26
Ride Control Pressure Switch F738-WH 200-BK
Drain Tube
CC
52
42
2B
41
1
1B 27 3B
1B
Ride Control Solenoid 976-OR 200-BK 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
A
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
BACKHOE VALVE GROUP
The Hydraulic Tank (23) is located between the engine and the cab. The sight gauge is located on the side of the tank.
1. Pilot Accumulator 52. Pressure Reducing Valve (Stabilizer) CC. Pilot Oil Pressure Test Port
HYDRAULIC TANK
PRESSURE REDUCING VALVE
(Dimensions: 39 inches x 28 inches)
Accumulator - Pilot Pressure
Description
PUMP OR MOTOR
Schematic Location
30 Page,
Machine Location
RENR7783-02 VOL 1 of 2
Part Number
AUX