KENR7619-01
30 Page, (Dimensions: 39 inches x 28 inches)
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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)
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
FLUID POWER SYMBOLS
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 ACTING
SINGLE 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
T
KENR7619-01
March 2008
928HZ Wheel Loader
Hydraulic System
BYD1-UP
CXK1-UP
©
2008 Caterpillar
All Rights Reserved
Printed in U.S.A.
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Brake 140-9251 1 C-7
Accumulator Gp - Pilot 243-4398 2 C-1
Accumulator Gp - Ride Control 223-9698 3 A-2
Connector - Orifice 8C-0564 4 C-5, C-4, C-3
Connector - Orifice 114-0441 5 A-3
Cooler - Hydraulic Oil 293-2240 6 B-8
Cooler As - Dual Disc Axle Oil 205-3652 7 B-8
Cylinder Gp - Coupler 190-3085 11 F-7
Cylinder Gp - LH Steering 125-0374 9 F-8
Cylinder Gp - Lift 11
9-1060 8 A-3, A-4
Cylinder Gp - RH Steering 125-0373 27 F-8
Cylinder Gp - Tilt 118-8105 10 A-5
Filter Gp 209-3149 12 A-7
Hand Metering Unit 223-2223 13 E-9
Manifold 209-0787 14 C-6
Motor Gp - Axle Oil Cooler 288-4166 15 B-8
Motor Gp - Radiator Fan 289-6393 16 A-7
Motor Gp - Reversing Fan 289-6394 16 A-7
Pump Gp - Brake/ Fan/ Filter 288-4162 17 B-7
Pump Gp- Implement / Steering 119-7698 19 C-6
Pump Gp - Supplementary Steer 293-2470 18 D-8
Scree
n 255-0759 20 A-7
Screen As 299-5499 21 B-7
Sensor Gp - Brake Pump Pressure 224-4536 22 B-6
Sensor Gp - Xmssn Neutralizer 290-5825 17 C-8
Strainer 262-5689 20 A-6
Switch As - Axle Cooler Press. 3E-7690 15 B-8
Switch As - Secondary Steering 230-5771 14 C-7
Tank Gp - Hydraulic 262-5654 20 A-6
Valve Gp - Ball, Dead Eng. Lwr 112-1817 28 A-3
Valve Gp - Check 9T-1013 13 D-8, B-2
Valve Gp - Check, Cooler Bypass 145-8983 6 B-8
Valve Gp - Check, Clr
Bypass W/ Axle Oil Clr 259-0558 6 B-8
Valve Gp - Control, 2 Section 133-4234 23 B-3 to B-5
Valve Gp - Control, 3 Section 133-4235 23 B-3 to B-5
Valve Gp - Coupler Control 233-2549 11 E-7
Valve Gp - Foot Brake 144-8521 22 C-8
Valve Gp - Pilot Shut-off 233-7133 26 C-1
Valve Gp - Pilot, 2 Single Func. Lvr 201-3360 4 C-3 to C-5
Valve Gp - Pilot, 3 Single Func. Lvr 201-3362 4 C-3 to C-5
Valve Gp - Pilot, Joystick 201-3359 4 C-3 to C-5
V
alve Gp - Pilot, Joystick and Aux 201-3361 4 C-3 to C-5
Valve Gp - Press Reducing 185-5209 24 C-2
Valve Gp - Relief 251-0907 25 D-8
Valve Gp - Ride Cntr. Press. Balance 141-1481 3 B-2
Valve Gp - Ride Control 297-1209 3 A-3
Valve Gp - Shutoff, Hydr. Drain 6V-7238 24 C-6
Component Locations
Tap Locations
Pressure and Sampling
Tap
Number
Description
Schematic
Location
AA Implement Pump Pressure C-6
BB Steering Pump Pressure D-2
CC Pilot Supply Pressure C-2
DD Front Brake Pressure C-8
EE Rear Axle Cooler Circuit Pressure B-8
SOS Hydraulic Oil Samoling Port (SOS) A-7
PILOT CONTROL
CCBB
242
MANIFOLD
HYDRAULIC OIL SAMPLING
SOS
FRONT BRAKE VALVE (22)
DD
22
COMPONENT LOCATIONS
16
16
15
15
12
177
177
6
6 1
21
18
18
20
20
24
14
3
3
4
23
23
14
24 22
22
13
13
9
9
5
8
8
8
10
10
11
11
25 19
27
21
12
1921 25
264
26
28
28
2
5
27
12
AA
14
24
MAIN CONTROL (23)
COUPLER
22
11
KENR7619-01
30 Page, Color 2, (Dimensions: 39 inches x 28 inches)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
ARROW PATTERNS
Taps (Pressure, Sampling, Sensor) by letter
Components by number
Connections by letter
AccuGrade Options
YY
1
AA
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
MAIN PUMP OUTPUT
PILOT PUMP OUTPUT
SCAVENGE PUMP
TBD 1 PUMP OUTPUT (NON STEERING)
TBD 2 PUMP OUTPUT
TBD 3 PUMP OUTPUT
TBD 4 PUMP OUTPUT
SUPPLY LINE
DRAIN / RETURN LINE
DRAIN / BRAKE COOLING (LARGE OFF-HIGHWAY TRUCKS)
STEERING CIRCUIT
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
THIS SCHEMATIC IS FOR THE 928HZ WHEEL LOADER
PART NUMBER: 289-8916, CHANGE: 03, VERSION: (-)
MEDIA #: KENR7619-01
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
STEERING / COUPLER PUMP OUTPUT
IMPLEMENT PUMP OUTPUT (NON STEERING)
STEERING CONTROL CIRCUIT
IMPLEMENT PILOT OUTPUT
STEERING SECONDARY PUMP AND CIRCUIT
FAN CIRCUIT
BRAKE COOLING CIRCUIT
SUPPLY LINE
COUPLER CONTROL CIRCUIT
TILT CYLINDER AND CONTROL CIRCUIT
BRAKE CONTROL CIRCUIT
ELECTRICAL WIRES
THIRD FUNCTION CONTROL CIRCUIT
LIFT CYLINDER AND CONTROL CIRCUIT
1
2
3
4
56
7
8
A
C
D
E
F
1
23
4
56
7
8
A
B
C
D
E
F
B
N1
S2
S3
T
LS
P
M
FROM CONTROLLER
X
TO REAR BRAKES
TO FRONT BRAKES
REAR AXLE
RACKBACK LOWER /
FLOAT
DUMP
WIRED TO CONTROLLER
RAISEFORWARD BACK
S1
TO THIRD FUNCTION
S4
SOS
AA
DD
BB
CC
EE
ACCUMULATOR GP
PILOT
243-4398
TANK GP
HYDRAULIC
262-5654
STRAINER
262-5689
SCREEN
255-0759
FILTER GP
209-3149
MOTOR GP
OPTIONAL
REVERSING FAN
289-6394
MOTOR GP
RAD. HYDR. FAN
289-6393
MOTOR GP
AXLE OIL
COOLER
288-4166
COOLER
HYDRAULIC OIL
293-2240
COOLER AS
DUAL DISC BRAKES
205-3652
SWITCH AS
AXLE CLR PRESS.
3E-7690
VALVE GP
CHECK
CLR BYPASS
145-8983
SCREEN AS
299-5499
PUMP GP
IMPLEMENT /
STEERING
119-7698
PUMP GP
BRAKE/
FAN/ FILTER
288-4162
VALVE AS
FOOT BRAKE
144-8521
ACCUMULATOR GP
BRAKE
140-9251
SENSOR GP
TRANSMISSION
NEUTRALIZER
290-5825
VALVE GP
RELIEF
251-0907
VALVE GP
CHECK
9T-1013
PUMP GP
SUPPLEMENTAL
STEERING
293-2470
SWITCH AS
SEC. STEERING.
230-5771
HAND METERING UNIT
223-2223
CYLINDER GP
RH STEERING
125-0373
CYLINDER GP
COUPLER
190-3085
VALVE GP
COUPLER CONTROL
233-2549
CYLINDER GP
LH STEERING
125-0374
MANIFOLD
209-0787
VALVE GP
SHUTOFF
HYDR. DRAIN
6V-7238
CONNECTOR
ORIFICE
8C-0564
CONNECTOR
ORIFICE
8C-0564
CONNECTOR
ORIFICE
8C-0564
VALVE GP
PILOT, JOYSTICK
201-3359
VALVE GP
PILOT
JOYSTICK / AUX
201-3361
VALVE GP
PILOT
JOYSTICK
2 SINGLE FUNC. LEVERS
201-3360
VALVE GP
PILOT
JOYSTICK
3 SINGLE FUNC. LEVERS
201-3362
VALVE GP
PRESS. REDUCING
185-5209
VALVE GP
SOLENOID
PILOT SHUTOFF /
DIFF. LOCK
233-7133
VALVE GP
RIDE CONTROL
297-1209
CYLINDER GP
LIFT
119-1060
CYLINDER GP
TILT
118-8105
ACCUMULATOR GP
RIDE CONTROL
223-9698
VALVE GP
BALL
DEAD ENG. LOWER
112-1817
CONNECTOR
ORIFICE
114-0441
VALVE GP
RIDE CONTROL
PRESS. BALANCE
141-1481
VALVE GP
CONTROL
2 SECTION
133-4234
VALVE GP
CONTROL
3 SECTION
133-4235
VALVE GP
CHECK
9T-1013
SENSOR GP
BRAKE
ACCUMULAOTR
PRESSURE
224-4536
