INTERACTIVE SCHEMATIC
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Tap Table
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EC-C3
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Hydraulic System
930G Wheel Loader
©
2008 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR8731-02
May 2008
TWR1-UP
TFW1-UP
Page 1 of 2
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Brake
140-9251 1
C-8
Accumulator Gp - Pilot
243-4398 2
C-6
Accumulator Gp - Ride Control
223-9698 3
D-5
Connector - Orifice
112-2628 4
C-7
Connector - Orifice
309-5128 5
B-3
Cooler - Heavy Duty
239-7395
6
B-8
- Standard
239-7394
Cooler As - Dual Disc Axle Oil
205-3652 7
B-8
Cylinder Gp - Coupler, Standard
190-3085
8
E-7
- Coupler, Wide
188-0982
Cylinder Gp - Lift
235-6823 9
C-5
Cylinder Gp - Steering 237-9271 10 E-8, C-3
Cylinder Gp - Tilt 235-6824 11 C-6
Filter Gp - (Element: 126-1818) 209-3149 12 B-8
Pump Gp - Hand Metering Unit Dual Mode 223-8333 13a C-3
Pump Gp - Hand Metering Unit W/ Thermal Bleed 242-8360 13b D-8
Manifold Return 242-0265 14 D-7
Motor Gp - Axle Oil Cooler 205-5268 15 B-8
Motor Gp - Rad / Hyd Fan 205-3669
16
B-8
- Reversing Fan 205-3668
Pump Gp - Brake / Fan / Filter 262-2875 17
B-7
Pump Gp - Imp / Str 237-0292 18 C-7
Pump Gp - Supplementary Steering 205-5266 19 C-8, B-3
Screen As 247-8298 20 B-8
Sensor Gp - Brake 224-4536 21 B-7
Sensor Gp - Tramsmission Neutralizer 290-5825 22 C-8
Switch As - Axle Cooler (Pressure) 3E-7690 23 B-8
Switch As - Ride Control Disable 126-6916 24 B-5
Switch As - Secondary Steering 230-5771 25 C-7
Tank Gp- Hydraulic 205-5408 26 A-7
Valve As - Foot Brake 144-8521 27 C-8
Valve Gp - 3rd Function Integrated Cont Flow 262-9706 28 E-2
Valve Gp - Check 263-8476 29 D-8
Valve Gp - Mnt, Dual Mode Steering Control 247-4503 30 C-3
Page 2 of 2
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Valve Gp - Shuttle Ride Control 141-1481 31 D-5
Valve Gp - 2 Joystick, 2 EH Function 247-0841
Valve Gp - 3rd Function Cont. Flow 243-0651 33
B-5
Valve Gp - 5th & 6th Function 242-0117 34 E-6
Valve Gp - Ball Dead Eng Lwr 191-9783 35 D-7
Valve Gp - Check 9T-1013 36 D-8, D-5, B-3
Valve Gp - Check, Back Press 294-0932 37 D-7
Valve Gp - Check, Str Bk Press 192-2684 38 D-7
Valve Gp - Combination - Relief And Diverter 173-4032 39 C-6
Valve Gp - Coupler Control 233-2549 40 D-7
Valve Gp - Implement 2 Section 280-1996
C-5
- Implement 3 Section 280-1997
- Implement 4 Section 280-1998
41
Valve Gp - Priority Steering 281-7276 42 C-7
Valve Gp - Relief 243-6627 43 D-8, B-3
Valve Gp - Resolver (Load Sense) 8J-6875 44 C-7
Valve Gp - Solenoid Ride Control 297-1209 45 D-5
Valve Gp - Shutoff Hydraulic Drain 6V-7238 46 C-7
Note: Refer to Parts Manual for your specific machine
- Joystick 212-1302
- Joystick and 2 Aux 212-1307
32
A-5
- Joystick and Aux 212-1305
TAP LOCATION
Tap
Number
Description
Schematic
Location
PT1
PUMP LOAD SENSE PRESSURE C-7, A-2
PT2
IMPLEMENT PRESSURE C-6
PT3
PILOT SUPPLY PRESSURE C-6
PT4
FRONT BRAKE PRESSURE C-8
PT5
TILT CYLINDER ROD END PRESSURE
C-6
PT6
TILT CYLINDER HEAD END PRESSURE
C-6
PT7
REAR AXLE COOLER CIRCUIT PRESSURE B-8
PT8
HYDRAULIC OIL SAMPLING PORT A-8
PT9
STEERING PRESSURE C-7, B-2
PT10
RETURN PRESSURE (TANK) C-6
FLUID POWER SYMBOLS
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)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
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
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
T
THIS SCHEMATIC IS FOR THE 930G WHEEL LOADER
PART NUMBER: 235-6836, CHANGE: 03, VERSION: (-)
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
MAIN PUMP OUTPUT
BRAKE / FAN / FILTER - PUMP
STEERING CIRCUIT
PILOT
SIXTH FUNCTION
AXLE OIL
LOAD SENSING
SUPPLY LINE
COUPLER CYLINDER
LOAD SENSING
THIRD FUNCTION
SECONDARY STEERING PUMP
LIFT CYLINDERS
FOURTH FUNCTION
FIFTH FUNCTION
TILT CYLINDERS
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
YY
1
2
3
4
56
7
8
A
C
D
E
1
23
4
56
7
8
A
B
C
D
E
B
MAIN SCHEMATIC
with Standard Steer
M
T
LS
P
1
PV
M
REVERSING FAN OPTION
TO REAR BRAKES
TO FRONT BRAKES
AXLE OIL
RACKBACK
LOWER /
FLOAT
DUMP
WIRED TO CONTROLLER
RAISE
T
LS
P
RACK
BACK
HOLD
DUMP
RAISE
HOLD
LOWER
FLOAT
OPEN/RAISE
HOLD
CLOSE/LOWER
OPEN/RAISE
HOLD
CLOSE/LOWER
b
TO THIRD FUNCTION
TO FOURTH FUNCTION
PT1
PT7
PT4
PT1
PT9
PT2
PT3
PT6
PT5
PT10
A
B
C
B
C
D
E
D
E
F
G
H
J
K
L
G
H
J
K
L
See location
D-6
See location A-7
See location C-7
PT9
RACKBACK
LOWER /
FLOAT
DUMP
WIRED TO CONTROLLER
RAISE
RACK
BACK
HOLD
DUMP
RAISE
HOLD
LOWER
FLOAT
OPEN/RAISE
HOLD
CLOSE/LOWER
OPEN/RAISE
HOLD
CLOSE/LOWER
TO FOURTH FUNCTION
C1
C2
INTEGRATED 3RD FUNCTION
(26) TANK GP
HYDRAULIC
205-5408
(18) PUMP GP
IMP / STR
237-0292
(41) VALVE GP
IMPLEMENT
2 SECTION 280-1996
3 SECTION 280-1997
4 SECTION 280-1998
(37) VALVE GP
CHECK BACK PRESS
294-0932
(27) VALVE AS
FOOT BRAKE
144-8521
(36) VALVE GP
CHECK
9T-1013
(36) VALVE GP
CHECK
9T-1013
(43) VALVE GP
RELIEF
243-6627
(43) VALVE GP
RELIEF
243-6627
(32) VALVE GP
JOYSTICK 212-1302
JOYSTICK AND AUX 212-1305
JOYSTICK AND 2AUX 212-1307
2 JOYSTICK EH FUNCTION 247-0841
(45) VALVE GP
SOLENOID
RIDE CONTROL
297-1209
(9) CYLINDER GP
LIFT
235-6823
(11) CYLINDER GP
TILT
235-6824
(8) CYLINDER GP
COUPLER
STANDARD 190-3085
WIDE 188-0982
(14) MANIFOLD
RETURN
242-0265
(2) ACCUMULATOR GP
PILOT
243-4398
(15) MOTOR GP
AXLE OIL COOLER
205-5268
(6) COOLER GP
STANDARD 239-7394
HEAVY DUTY 239-7395
(13b) PUMP GP
HAND METERING UNIT
W/ THERMAL BLEED
243-8360
(13a) PUMP GP
HAND METERING UNIT
DUAL MODE
223-8333
(19) PUMP GP
SUPPLEMENTARY
STEERING
205-5266
(19) PUMP GP
SUPPLEMENTARY STEERING
205-5266
(10) CYLINDER GP
STEERING
237-9271
(10) CYLINDER GP
STEERING
237-9271
(1) ACCUMULATOR GP
BRAKE
140-9251
(3) ACCUMULATOR GP
RIDE CONTROL
223-9698
(40) VALVE GP
COUPLER CONTROL
233-2549
(17) PUMP GP
BRAKE/ FAN/ FILTER
262-2875
(16) MOTOR GP
RAD/ HYDR 205-3669
REVERSING 205-3668
(12) FILTER GP
(ELEMENT: 126-1818)
209-3149
(39) VALVE GP
COMBINATION
RELIEF
AND DIVERTER
173-4032
(44) VALVE GP
RESOLVER
(LOAD SENSE)
8J-6875
(35) VALVE GP
BALL
DEAD ENG LWR
191-9783
(7) COOLER AS
DUAL DISC AXLE OIL
205-3652
(46) VALVE GP
SHUTOFF
HYDRAULIC DRAIN
6V-7238
(25) SWITCH AS
SECONDARY STEERING
230-5771
(22) SENSOR GP
TRANSMISSION NEUTRALIZER
290-5825
(23) SWITCH AS
AXLE COOLER (PRESSURE)
3E-7690
(38) VALVE GP
CHECK STR BK PRESS
192-2684
(20) SCREEN AS
247-8298
(34) VALVE GP
5TH AND 6TH FUNCTION
242-0117
(33) VALVE GP
3RD FUNCTION
CONT. FLOW
243-0651
(42) VALVE GP
PRIORITY
STEERING
281-7276
(28) VALVE GP
3RD FUNCTION
INTEGRATED
CONT. FLOW
262-9706
(30) VALVE GP
MNT DUAL MODE
STEERING CONTROL
247-4503
(21) SENSOR GP
BRAKE
224-4536
(29) VALVE GP
CHECK
263-8476
(31) VALVE GP
SHUTTLE
RIDE CONTROL
141-1481
(36) VALVE GP
CHECK
9T-1013
(4) CONNECTOR
ORIFICE
112-2628
(5) CONNECTOR
ORIFICE
309-5128
QUICK STEER WITH SEC. STEERING
REAR/DETENTFRONT
N1
S2
S3
A
F
PV
A1
A2
0
EF
T
BACK FORWARD
(24) SWITCH AS
RIDE CONTROL
DISABLE
126-6916
S1
PT8
COMBINATION VALVE
PT6
PT5
39
VIEW ALL CALLOUTS
HYDRAULIC OIL COOLER
PT8
126
VIEW ALL CALLOUTS
MAIN CONTROL VALVE FIFTH AND SIXTH
FUNCTION
The main control valve (fifth function and sixth function) (41) is located on the left side of the
machine below the platform behind the articulation joint.
The main control valve (fifth function and sixth function) (41) supplies oil to work tools. The main
control valve (fifth function and sixth function) is a one-piece valve body that contains two valves.
The two control valves are actuated by electricity. The electronic signal that actuates the control
valves does not go through the ECM.
34
SECONDARY STEERING PRESSURE SWITCH
25

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