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ELECTRICAL SYMBOLS
HOTKEYS (Keyboard Shortcuts)
BASIC HYDRAULIC COMPONENT SYMBOLS
T
FUNCTION Zoom In Zoom Out Fit to Page Hand Tool Find
KEYS “CTRL” / “+” “CTRL” / “-” “CTRL” / “0” (zero) “SPACEBAR” (hold down) “CTRL” / “F”
Pressure Switch
Temperature Switch
Level Switch
Flow Switch
Circuit Breaker
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Pump or Motor
Variability
Fluid Conditioner
Spring (Adjustable)
SCHEMATIC SYMBOLS AND DEFINITIONS INTERNAL PASSAGEWAYS
VALVES
ENVELOPES
Two Position
One Position
Three Position
PORTS
Two-way
Three-Way
FLOW IN ONE DIRECTION
FLOW ALLOWED IN EITHER DIRECTION
Infinite Positioning
Two Position
PARALLEL FLOW
PUMPS
Unidirectional
Three Position
Unidirectional
CONTROL AB
AB
P T
P T
Single Acting
Spring Loaded
Fluid Conditioner
Spring (Adjustable)
Spring
Pressure Compensation
Control Valves
Line Restriction (Variable)
Restriction
Line Restriction (Fixed)
Line Restriction Variable and Pressure Compensated
2-Section Pump
Attachment
Pump: Variable and Pressure Compensated
Bidirectional
MOTORS
Double Acting
Infinite Position
CHECK
Basic Symbol
Variability
FIXED DISPLACEMENT
Shifted Position
Normal Position
Pump or Motor
Bidirectional
VARIABLE DISPLACEMENT NON- COMPENSATED
CYLINDERS
Four-Way
BASIC HYDRAULIC COMPONENT SYMBOLS
FIXED DISPLACEMENT
CROSS FLOW
ACCUMULATORS
Shuttle
Unidirectional
VARIABLE DISPLACEMENT NON- COMPENSATED
Pilot Controlled
Spring Loaded Gas Charged
Unidirectional
PILOT CONTROL
Bidirectional
ROTATING SHAFTS
RELEASED PRESSURE
External Return
Bidirectional
Unidirectional
Internal Return
Bidirectional
REMOTE SUPPLY PRESSURE
Simplified
Complete
Internal Supply Pressure
Hydraulic Pneumatic Energy Triangles
COMBINATION CONTROLS
Solenoid
Solenoid or Manual
Solenoid and Pilot
Solenoid and Pilot or Manual
MEASUREMENT
LINES
Servo
Thermal
Detent
Crossing
Joining
Manual Shutoff
General Manual
Push Button
Pedal
Spring
Vented
Pressurized
Transducer (Fluid)
Transducer (Gas / Air)
M
Generator
Electric Motor
Flow
Return Above Fluid Level
Return Below Fluid Level
ELECTRICAL SYMBOLS
HYDRAULIC SYMBOLS - ELECTRICAL G
Temperature
Pressure
FLUID STORAGE RESERVOIRS
MANUAL CONTROL
Push-pull Lever
MAIN AUX.
T
Pressure Switch
Pressure Switch (Adjustable)
Temperature Switch
Electrical Wire
Pressure Switch
Temperature Switch
BASIC ELECTRICAL COMPONENT SYMBOLS
Level Switch
Flow Switch
Circuit Breaker
HARNESS AND WIRE SYMBOLS Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it. Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component.
AG-C4 111-7898 Part Number: for Connector Plug
1
L-C12 3E-5179
2
Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine.
Receptacle Pin or Socket Number
Plug
Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...) Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...)
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
T
Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure. Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay. Solenoid: A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work. Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a permanent magnet. It has two coils (latch and unlatch) that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.
L-C12 3E-5179 5A Fuse (5 Amps)
Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".
9X-1123
Component Part Number
325-AG135 PK-14 Wire Gauge Wire Color
1 2
Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
1 2
Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
UENR3236 April 2012
420F and 430F Backhoe Loader Hydraulic System 420F: LTG1-UP SKR1-UP
430F: LDY1-UP
© 2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
COMPONENT LOCATION COMPONENT LOCATIONS
Pump GP - Implement
Part Number 307-3069
Machine Location 1
Schematic Location B-4
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
Description
Filter - Hydraulic
359-7232
5
B-3
Valve HMU - Load Sense Relief
341-7654
6
C-6
214-5097
7
B-6
8
B-8
Cylinder - Front Steer Cylinder - LIFT
LH:
358-5034
RH:
358-5035
Cylinder - Tilt
358-5044
9
B-8
Cylinder - MP Bucket (OPT)
185-1839
11
A-8
Cylinder - Stab Cylinder - Boom Cylinder - Stick Cylinder - Swing Cylinder - Bucket
LH:
291-2681
RH:
291-2682
420F:
210-7076
430F:
246-9884
420F:
210-7082
430F:
210-7092
LH:
381-8055
RH:
381-8054
420F:
210-7088
430F:
210-7096
12
F-6 F-3
13
F-5
14
F-4
15
F-5
16
F-4
Cylinder - E-Stick
210-7098
17
F-3
Accumulator - Pilot
226-0420
18*
C-5
Valve - Ride Control (OPT)
245-8780
19
C-8
Accumulator (OPT)
382-8033
20
C-8
Sensor - Ride Control (OPT)
344-7391
21
C-8
Sensor - Temp (OPT)
264-4297
22
C-3
Switch - Diff Temp (OPT)
134-0404
23*
C-3
Valve - Loader (PL/IT)
359-7211
27
C-7
28
F-6 D-6
Valve - Backhoe
6 Bank:
359-7208
7 Bank:
359-7210
8 Bank:
359-7212
Valve - Pattern Change
300-4491
29
Valve - Cushion
206-3685
30
F-5
Valve - Check (Stab)
359-7213
31
F-3, F-6
359-7227
32
F-8, F-1
34*
E-8
Valve GP - Pilot (HOE) Valve GP - Pilot (STAB)
STD:
359-7246
W/SWITCH:
359-7247
DTNT and SWITCH:
359-7248
Manifold - Pilot (BASIC +4)
359-7224
35
D-4
Sensor - Pump Discharge
344-7391
36
C-5
Valve - Boosted Brake
220-8226
37
D-3
Valve - Coupler (HOE)
358-2091
50*
A-3
Cylinder - Coupler (HOE)
361-1139
51*
B-3
* COMPONENTS NOT SHOWN
TAP LOCATION
TAP LOCATIONS Pressure, Sampling, Sensor Tap Number
Description
Schematic Location C-5
T1
PUMP DISCHARGE PRESSURE
T2
RIGHT REAR SERVICE BRAKE
C-4
T3
REAR PARK BRAKES
D-5
8
7
6
5
(12) CYLINDER - STAB 291-2681
(32) VALVE GP - PILOT (HOE) 359-7227
4
(13) CYLINDER - BOOM 420F: 210-7076 430F: 246-9884
2
(14) CYLINDER - STICK 420F: 210-7082 430F: 210-7092
OPERATOR RIGHT JOYSTICK (32) VALVE GP - PILOT (HOE) 359-7227
(31) VALVE - CHECK (STAB) 359-7213
(30) VALVE - CUSHION 206-3685
(31) VALVE CHECK (STAB) 359-7213
1
(12) CYLINDER - STAB 291-2682
(16) CYLINDER - BUCKET 420F: 210-7082 430F: 210-7092
(15) CYLINDER - SWING LH: 381-8055 RH: 381-8054
OPERATOR LEFT JOYSTICK
3
(17) CYLINDER - E STICK (OPT) 210-7098
F L3 RS2 (28) VALVE - BACKHOE 6 BANK: 359-7208 7 BANK: 359-7210 8 BANK: 359-7212
L4
L2
L3
SA
BA
A1
LS2
R2
A2
B1
F
B2
A3
A5
B4
A4
B3
B5
EA
A6
A7
B6
R1
HAA
B7
A8
R3
R4
R2
B8
L1
(34) VALVE GP - PILOT (STAB) STD: 359-7246 W / SWITCH: 359-7247 DTNT and SWITCH: 359-7248
STABILIZER JOYSTICK OPERATOR LEFT
OPERATOR RIGHT
E
E
BOOM
RH STAB RS1
RS2
LS2
LS1
RS1
BUCKET
SWING
BB
LH STAB
STICK
R4
EB
LS1
L1
AUX
E-STICK
HAB
SB
T6
EB BB
SA
BA
SB
J2
P6
(29) VALVE - PATTERN CHANGE 300-4491
T2
T3
LAA (37) VALVE - BOOSTED BRAKE 220-8226
J3 LEFT BRAKE PEDAL
J1
TO REAR AXLE LEFT WHEEL BRAKE
D R1
L4
R3
D
L2 T1 TO REAR AXLE RIGHT WHEEL BRAKE
RIGHT BRAKE PEDAL
P
(27) VALVE - LOADER (PL/IT) 359-7211
ACC
BRK
DIAG
T3
(18) ACCUMULATOR - PILOT 226-0420
EA
LAB
(35) MANIFOLD - PILOT (BASIC +4) 359-7224
(20) ACCUMULATOR - OPTIONAL 382-8033
(19) VALVE - RIDE CONTROL (OPT) 245-8780
C
DLS
P
C
(21) SENSOR RIDE CONTROL (OPT) 344-7391
T2
ACC
PS
T1
(6) VALVE HMU - LOAD SENSE RELIEF 341-7654 T
(22) SENSOR - TEMP (OPTIONAL) 264-4297
D R
(36) SENSOR PUMP DISCHARGE 344-7391
H
LIFT
(8) CYLINDER - LIFT LH: 358-5034 RH: 358-5035
LIFT
(23) SWITCH - DIFF PRESS (OPTIONAL) 134-0404
T7
P7
LINE PATTERNS Pressure Line
(4) COOLER - HYDRAULIC 337-9751
B1
Pilot / Load Sensing Pressure
U
Drain / Return Lines
S
A1
Component Group
(5) FILTER - HYDRAULIC 359-7232
B
CALLOUTS YY
Callout Number
(Machine Location from Component LocationsTable)
TILT
(9) CYLINDER - TILT 358-5044
FRONT STEER CYL.
PILOT PUMP OUTPUT MAIN PUMP OUTPUT LIFT CYLINDER CIRCUIT BUCKET CYLINDER CIRCUIT LOAD SENSE CIRCUIT STEERING CIRCUIT STICK CYLINDER CIRCUIT SUPPLY LINE AUX CIRCUIT BOOM CYLINDER CIRCUIT TILT CYLINDER CIRCUIT LOADER VALVE CIRCUIT DRAIN / RETURN LINE STABILIZER CYLINDER CIRCUIT SWING CYLINDER CIRCUIT E-STICK CYLINDER CIRCUIT COUPLER CIRCUIT (HOE)
(7) CYLINDER - FRONT STEER 214-5079
(50) VALVE - COUPLER (HOE) 358-2091 (11) CYLINDER MP BUCKET (OPT) 185-1839
Component Name
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
(51) CYLINDER COUPLER (HOE) 347-2223
B2 A2
(52) VALVE GP - CONTROL 138-1234 Part Number
B
(1) PUMP GP - IMPLEMENT 307-3069
L
R
Taps (Pressure, Sampling, Sensor - by letter)
AUX
BOOSTED BRAKE OIL CIRCUIT
A
A
B3 AUX
(2) TANK - HYDRAULIC 358-9301
A3
T7
P7
BACKHOE COUPLER
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.
(3) TANK GROUP - FILTER / BREATHER / SIGHT GAGE 351-5888
8
7
6
5
THIS SCHEMATIC IS FOR THE 420F AND 430F BACKHOE LOADER HYDRAULIC SYSTEM MEDIA NUMBER: UENR3236 SCHEMATIC PART NUMBER: 362-9207, CHANGE: 01, VERSION: -
4
3
2
1
FRONT VIEW VIEW ALL CALLOUTS
8
9
4
20
REAR MACHINE VIEW VIEW ALL CALLOUTS
11 16
14 32 13
15
12
BOOM VIEW - WITH E-STICK VIEW ALL CALLOUTS
17
UNDER CAB VIEW VIEW ALL CALLOUTS
3 2
7
37 T1
1 22 5
6 T2
36 27 30 28 21 19
REAR FRAME VIEW VIEW ALL CALLOUTS
35 29 31
T3
