SENR1368-02 December 2011
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN
PUMP OR MOTOR
FLUID CONDITIONER
SPRING
CONTROL VALVES
VARIABILITY
SPRING (ADJUSTABLE)
LINE RESTRICTION (VARIABLE)
PRESSURE COMPENSATION
RESTRICTION
LINE RESTRICTION (FIXED)
AUX
PUMP (2 - SECTION)
Steering Component Locations Description
Machine Location
Schematic Location
1
B-3
Steering and Brake Hydraulic Tank
Machine Location
Schematic Location
Steering Pilot Pump
19
B-2
Description
Steering Pump
2
B-4
Cooler (Air to Oil)
20
D-3
Steering Control Valve 1
3
E-5
Check Valve (cooler bypass)
21
C-3
Steering Relief Valve
4
D-5
Steering Pilot Oil Filter
22
C-3
Steering Cylinder Crossover Relief Valve
5
E-7
Ball Valve (Cooler Drain)
23
D-3
Shuttle Valve
6
E-6
Secondary Steering Selector and Pressure Control Vavle 1
24
C-5
Pressure Reducing Valve
7
D-5
Steering Pilot Relief Valve
25
C-3
Orifice
8
D-6
Steering Pilot Check Valve
26
C-5
Ball Valve
9
D-6
Brake Pump
27
B-1
Secondary Steering Diverter Valve 1
10
E-4
Brake Accumulator Check Valve
28
C-1
Check Valve 1
11
D-4
Brake Accumulator (Front and Rear Brakes)
29
C-1
Check Valve
12
E-4
Brake Pump Check Valve
30
C-1
Secondary Steering Relief Valve 1
13
E-4
Screen
31
B-1, B-4, D-4
Secondary Steering Pump 1
14
C-4
Case Drain Filter
32
B-2, B-4
Steering Pilot Valve
15
B-7
Bypass Pressure Switch 3
33
B-2, B-4
Steering Neutralizer Valve(s) for Right and Left Turn
16
C-7, C-6
Breaker Relief Valve (34a, 34b4)
34
A-4, A-5
Steering Neutralizer Check Valve
17
D-6
Air Expansion Tank 2
35
A-5
Steering Cylinder (Left and Right)
18
F-6
Bypass Pressure Switch 3
36
C-2
1
Secondary Steering is an optional attachment. 2 European Union attachment, 124 liters air. 3 Optional attachment with VIMS only. 4 34b = European Union attachment, 35 ± 7 kPa.
TWO POSITION
ATTACHMENT
VALVE PORTS
THREE POSITION
TWO - WAY
THREE - WAY
CONTROL VALVES AB
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
VALVES
VALVE ENVELOPES
ONE POSITION
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
PUMP (VARIABLE & PRESSURE COMPENSATED)
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
992G Wheel Loader Hydraulic System
PRESSURIZED
VENTED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
ROTATING SHAFTS
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
7HR1-UP ADZ1-UP
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
SERVO
THERMAL
DETENT
MANUAL CONTROL SYMBOLS
Steering and Brake Pressure Tap Locations Tap
Description
AA BB CC DD
Steering Pilot Supply Steering Pump Discharge Steering Cylinder (Right) Steering Cylinder (Left)
MANUAL SHUTOFF
PUSH - PULL LEVER
Schematic Location C-3
GENERAL MANUAL
PUSH BUTTON
PEDAL
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
REMOTE SUPPLY PRESSURE
B-4 E-6 E-6
EXTERNAL RETURN
INTERNAL RETURN
SPRING LOADED
GAS CHARGED
LINES CROSSING
COMPLETE
VARIABLE DISPLACEMENT NON-COMPENSATED
FIXED DISPLACEMENT
SINGLE ACTING
LINES JOINING
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
INFINITE POSITIONING
Volume 1 of 2: Steering
© 2011 Caterpillar, All Rights Reserved
53
54
25
29
48
DD GG FF
EE
5
22
23
II
JJ
7
8
9
10
11
18
19
44
21
27
33
34
35
37
42
43
50
51
16
17
20
6
14
28
15
36
AA BB
3
1
DOUBLE ACTING
INTERNAL PASSAGEWAYS
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
HYDRAULIC MOTORS
HYDRAULIC PUMPS FIXED DISPLACEMENT
SIMPLIFIED
CROSSING & JOINING LINES
ACCUMULATORS
49
SPRING
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
2 POSITION
FLOW IN EITHER DIRECTION
Printed in U.S.A.
CC
ELECTRICAL SYMBOLS TABLE 24
40
46
52
41
56
G
HH
12
4
38
24
55
57
13
26
32
2
31
M
TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
47
3
ELECTRICAL SYMBOLS (ELECTRICAL)
T
PRESSURE SWITCH
TEMPERATURE SWITCH
LEVEL SWITCH
FLOW SWITCH
WIRE NUMBER IDENTIFICATION CODES
30
39
46
52
40
45
II
JJ
49
5 53
22
23
25
54 DD EE
48
7
8
9
10
11
43
44
35
FF GG
18
19
21
27
33
37
42
34
29
50
51
12
26
13
31
32
ELECTRICAL SCHEMATIC EXAMPLE
HYDRAULIC SCHEMATIC EXAMPLE
CURRENT STANDARD
CURRENT STANDARD
AA BB
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE
HH
CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
CIRCUIT NUMBER IDENTIFICATION
WIRE COLOR
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD WIRE
WIRE COLOR
B
325-PK-14
CIRCUIT NUMBER IDENTIFICATION
41
56
57
24
55
38
4
28
36
16
17
20
6
14
15
1
2
3
47 CC
WIRE GAUGE
A
(EXAMPLE VALVE)
(Dimensions: 34 inches x 24 inches)
39
45
16 Page,
30
SENR1368-02 VOL 1 of 2
HYDRAULIC SYMBOLS (ELECTRICAL)