SENR6797 - 01 January 2012 5
3
1
10
19
20
4
6
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
7
Component Location
MAIN
Part Part Machine Number Number Location for IT38G for 938G
Description
Schematic Location
Accumulator Atch
124-9439
124-9439
1
E-3
Accumulator Atch (Alternate Ride Control)
124-9439
124-9439
1
E-3
Accumulator Hydraulic
213-8773
213-8773
2
D-8 , D-7
Core As. (Hydraulic Oil Cooler)
135-5327
135-5327
3
C-4
Cylinder Gp - Lift
114-8131 128-7678 105-0094, 105-0094, 139-3312 139-3312 115-6963 9T-7161
4
E-4
5
F-1
Cylinder Gp - Steering Cylinder Gp - Tilt Cylinder Gp (Coupler)
9T-8823
Filter Element
-
6
F-4
7
F-5
9J-5461
9J-5461
8
A-4
HMU (Hand Metering Unit)
113-0061
113-0061
9
D-1
Housing
101-2704
-
10
D-3
Manifold
9U-3862
9U-3862
10
E-3 C-5
Motot Gp (Fan Drive)
159-7986
159-7986
11
Pump Gp
105-2140
105-2140
12
B-7
Pump Gp - Piston (Hydraulic Fan)
139-6084
139-6084
13
B-5
Pump Gp - Supplemental Steering (Atch)
139-2327
123-8915
14
B-2
Tank Gp - Hydraulic
154-2140
160-3408
15
A-4
Valve - Bypass (Hydraulic Oil Cooler)
130-5202
130-5202
3
C-4
Valve - Check (Pilot) Valve - Check (Ride Control)
9T-3096 9T-3096
9T-3096 9T-3096
12 1
C-7 E-4
Valve Gp - Accumulator Charge
134-5106
134-5106
16
D-7
Valve Gp - Breaker Relief
9T-0818
9T-0818
15
B-4
Valve Gp - Diverter (Supplemental Steering) (Atch)
141-2597
141-2597
17
C-2
Valve Gp - Main Control
133-4240
133-4238
18
E-4
Valve Gp - Main Control (Atch)
133-4241
133-4239
Valve Gp - Main Implement Relief
108-6428
108-6428
19
E-6
18
D-6
19
C-4
Valve Gp - Manual Hydraulic Lockout
112-1817
112-1817
Valve Gp - Pilot
122-6346
122-6344
Valve Gp - Pilot (Atch)
122-6347
122-6239
Valve Gp - Relief
Valve Gp - Relief (Line) (Coupler Cylinder)
4T-2764 122-6842, 105-7715 105-7715
105-7715
19
E-5
Valve Gp - Relief (Line) (To fourth Function)
105-7715
-
20
E-6
Valve Gp - Relief (Line,Tilt Cyl Head End Port)
106-8528
106-8528
19
E-4
Valve Gp - Relief (Steering Backup)
6E-3447
6E-3447
21
E-2 E-1
Valve Gp - Relief (Line)
4T-2764
10
D-3
105-7715
19
E-4
Valve Gp - Relief Steering Control
9T-7420
9T-7420
21
Valve Gp - Relief Steering Crossover
9T-7419
9T-7419
21
E-1
Valve Gp - Selector And Press Cont (Pilot)
6E-3078
6E-3078
22
D-6
Valve Gp - Shutoff
6W-8221
-
7
E-5
Valve Gp - Solenoid
8T-8808
-
18
D-4 ,D-5
Valve Gp - Solenoid (Ride Control) (Atch)
149-2658
149-2658
1
E-3 , D-3
Valve Gp - Tandem Brake
215-3687
215-3687
23
E-7
Valve Gp (Atch) (To Fourth Function)
6E-5958
6E-5958
20
E-6
Valve Gp (Atch) (Coupler)
6E-5958
6E-5958
20
E-5
PUMP OR MOTOR
FLUID CONDITIONER
SPRING
CONTROL VALVES
VARIABILITY
SPRING (ADJUSTABLE)
LINE RESTRICTION (VARIABLE)
PRESSURE COMPENSATION
LINE RESTRICTION (FIXED)
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
TWO POSITION
PUMP (VARIABLE & PRESSURE COMPENSATED)
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
ATTACHMENT
VALVE PORTS
THREE POSITION
TWO - WAY
THREE - WAY
CONTROL VALVES AB
AUX
PUMP (2 - SECTION)
VALVES
VALVE ENVELOPES
ONE POSITION
RESTRICTION
FOUR - WAY
CHECK VALVES
A B
P T
P T
NORMAL POSITION
SHIFTED POSITION
BASIC SYMBOL
INFINITE POSITION
SPRING LOADED
SHUTTLE
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
PRESSURIZED
VENTED
13
11
22
12 GG
11
15
21 JJ
17
14 BB
9
938G Wheel Loader And IT38G Integrated Toolcarrier Hydraulic System
HH
18
8
5
1
19
10
20
938G: 4YS1-UP 6WS1-UP 8RS1-UP 9HS1-UP
RETURN ABOVE FLUID LEVEL
PRESSURE
ROTATING SHAFTS
TEMPERATURE
FLOW
IT38G: 7BS1-UP 1CW1-UP
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
PUSH - PULL LEVER
SOLENOID & PILOT OR MANUAL
GENERAL MANUAL
MANUAL SHUTOFF
SPRING LOADED
21 JJ
14 17 BB
9
5
4
6
DETENT
PEDAL
SIMPLIFIED
LINES CROSSING
COMPLETE
FIXED DISPLACEMENT
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
SINGLE ACTING
LINES JOINING
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
SPRING
REMOTE SUPPLY PRESSURE
CROSSING & JOINING LINES
GAS CHARGED
FIXED DISPLACEMENT
12
THERMAL
PUSH BUTTON
INTERNAL RETURN
HYDRAULIC PUMPS
GG
SERVO
PILOT CONTROL SYMBOLS
ACCUMULATORS
22
BIDIRECTIONAL
MANUAL CONTROL SYMBOLS
EXTERNAL RETURN
13
UNIDIRECTIONAL
COMBINATION CONTROLS
RELEASED PRESSURE
3
RETURN BELOW FLUID LEVEL
MEASUREMENT
DOUBLE ACTING
INTERNAL PASSAGEWAYS
VARIABLE DISPLACEMENT NON-COMPENSATED
INFINITE POSITIONING
3 POSITION
2 POSITION
7
HH
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
Machine Harness Connector And Component Locations © 2012 Caterpillar, All Rights Reserved
FLOW IN EITHER DIRECTION
Printed in U.S.A.
ELECTRICAL SYMBOLS TABLE Tap Locations Pressure, Sampling, and Sensor
G
2
C D
M
TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
C D
ELECTRICAL SYMBOLS (ELECTRICAL)
T
PRESSURE SWITCH
TEMPERATURE SWITCH
LEVEL SWITCH
FLOW SWITCH
WIRE NUMBER IDENTIFICATION CODES ELECTRICAL SCHEMATIC EXAMPLE
HYDRAULIC SCHEMATIC EXAMPLE
CURRENT STANDARD
CURRENT STANDARD
39
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG”
16
WIRE CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
CIRCUIT NUMBER IDENTIFICATION
WIRE COLOR
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD WIRE
SECTION D-D
SECTION C-C BRAKES
WIRE COLOR
B
325-PK-14
CIRCUIT NUMBER IDENTIFICATION
WIRE GAUGE
A
(EXAMPLE VALVE)
(Dimensions: 39 inches x 28 inches)
Steering Pump Pressure Implement Pump Pressure Pilot Pump Pressure Hand Metering Unit Supply
Schematic Location C-8 B-7 D-6 C-1
30 Page,
Description
SENR6797-01
Tap Number GG JJ BB HH
HYDRAULIC SYMBOLS (ELECTRICAL)