COMPONENT LOCATIONS Description
Part Number
IMPLEMENT PUMP GP HYDRAULIC TANK TANK GROUP HYDRAULIC COOLER HYDRAULIC FILTER HMU STEER CYL-FRONT
Machine Location 1 2 3 4 5 6 7
Schematic Location B-4 A-5 A-5 B-4 B-3 C-6 B-6
8
B-8
9 10
TILT CYL (PL/IT) MP BUCKET CYL (OPT)
307-3069 358-9301 351-5888 337-9751 359-7232 341-7654 217-5097 374-8060 374-8059 370-7083 185-1839
STABILIZER CYL
320-5938
11
BOOM CYL STICK CYL
12 13 14
F-5
BUCKET CYL E-STICK CYL (OPT) ACCUMULATOR (PILOT) RIDE CNTRL VALVE (OPT) RIDE CNTRL ACC (OPT) RIDE CNTRL SENSOR (OPT) TEMP SENSOR (OPT) DIFF PRES SWITCH (OPT) COUPLER VALVE (LDR) COUPLER CYL (LDR) LOADER VALVE (PL/IT) BACKHOE VALVE PATTERN CHANGING VALVE SWING CUSHION VALVE
320-6522 320-6523 381-8055 381-8054 320-5937 320-5935 226-0420 245-8780 382-8033 344-7391 264-4297 134-0404 359-7228 178-3713 359-7211 359-7216 300-4491 320-7812
B-8 A-8 F-6 F-3 F-6 F-4
15 16 17 18 19 20 21 22 23 24 25 26 27 28
STAB CHECK VALVE
308-3437
29
VALVE GP-PILOT (HOE)
359-7227
30
382-4996 359-7246 359-7247 359-7248 359-7224 344-7391 220-8226 373-6998 347-1128 347-1129 262-7081 262-7079 351-1637 347-2223 319-2155 373-7028 319-2158 373-7029 358-2091 361-1139 424-2971
31
F-4 F-3 C-5 C-8 C-8 C-8 C-4 C-4 A-8 A-8 C-7 F-7 D-6 F-5 F-3 F-6 F-2 F-8 D-7
32
E-8
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
D-4 C-5 D-3 A-6 F-6 F-4 B-8 B-8 B-2 F-1 E-1 D-1 D-2 C-1 A-3 B-3 C-6
LH: RH:
LIFT CYL
LH: RH:
SWING CYL
VALVE GP-PILOT (LDR) VALVE GP-PILOT (STAB)
STD: W/SWITCH DTNT and SWITCH:
PILOT MANIFOLD (BASIC +4) PUMP DISCHARGE PRES SNSR BOOSTED BRAKE VALVE ALL WHEEL STEER VALVE (NOT SHOWN) HOSE BURST CHECK VALVE (BOOM) HOSE BURST CHECK VALVE (STICK) HOSE BURST CHECK VALVE (LIFT) HOSE BURST CHECK VALVE (TILT) POWERED SIDESHIFT VALVE POWERED SIDESHIFT CYL 8TH AUXILIARY VALVE 8TH AUXILIARY PILOT VALVE 9TH AUXILIARY VALVE 9TH AUXILIARY PILOT VALVE COUPLER VALVE (HOE) COUPLER CYLINDER (HOE) VALVE - CHECK
UENR3879 November 2012
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
29
26 43 44
30
31
1
2
3
8
9
MAIN AUX.
4
PUMP or MOTOR
11
TWO POSITION
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
VALVE PORTS
TWO-WAY
THREE POSITION
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
VALVES
VALVE ENVELOPES
ONE POSITION
LINE RESTRICTION (FIXED)
RESTRICTION
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
FOUR-WAY
THREE-WAY
CONTROL VALVES
CHECK VALVES
AB
AB
P T SHIFTED POSITION
P T NORMAL POSITION
INFINITE POSITION
SHUTTLE
SPRING LOADED
BASIC SYMBOL
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
VENTED
RETURN ABOVE FLUID LEVEL
PRESSURIZED
RETURN BELOW FLUID LEVEL
MEASUREMENT
444F Backhoe Loader Hydraulic System
PRESSURE
ROTATING SHAFTS
FLOW
TEMPERATURE
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
LJJ1-UP FBN1-UP
SOLENOID or MANUAL
SOLENOID
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
41 MANUAL SHUTOFF
PUSH-PULL LEVER
GENERAL MANUAL
PUSH BUTTON
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
PEDAL
SPRING
REMOTE SUPPLY PRESSURE
29 EXTERNAL RETURN
INTERNAL RETURN
SIMPLIFIED
ACCUMULATORS
11
33 32
SPRING LOADED
CROSSING AND JOINING LINES
LINES CROSSING
GAS CHARGED
25 34
45 46
T1
6
49
8
9
FIXED DISPLACEMENT
RIGHT
HYDRAULIC AND PNEUMATIC CYLINDERS
LINES JOINING
SINGLE ACTING
HYDRAULIC MOTORS
HYDRAULIC PUMPS VARIABLE DISPLACEMENT NON-COMPENSATED
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
COMPLETE
DOUBLE ACTING
INTERNAL PASSAGEWAYS THREE POSITION
INFINITE POSITIONING
FLOW IN ONE DIRECTION
PARALLEL FLOW
TWO POSITION
CROSS FLOW
FLOW ALLOWED IN EITHER DIRECTION
(NOT SHOWN) = Graphic not avalible at time of publication.
40
10
39
35 © 2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
42 Electrical Symbols Table Hydraulic Symbols (Electrical)
Transducer (Gas / Air)
Generator
Electric Motor
Schematic Location
T1
PUMP DISCHARGE PRESSURE
C-5
T2
RIGHT REAR SERVICE BRAKE (See Volume 3)
C-4
T3
REAR PARK BRAKES (See Volume 3)
D-5
Pressure Switch (Adjustable)
Pressure Switch
14
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
38 T
10
40
39
18 19
16
5
Pressure Symbol
Temperature Symbol
Level Symbol
Wire Number Identification Codes
LEFT
13
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard
21
27
17
7
20
Flow Symbol
48
24
Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14
12
325-PK Circuit Identification Number
37
Wire Color
Wire Gauge
Previous Standard Wire Color
Wire
325-PK-14 B Circuit Number Identification
STICK + E STICK
28
T3
22
T2
BOTTOM
47
23
MACHINE VIEWS
A
Wire Gauge (EXAMPLE VALVE)
UENR3879-00
Description
Transducer (Fluid)
M (Dimensions: 39 inches x 28 inches)
14
TAP LOCATIONS Pressure, Sampling, Sensor Tap Number
G
30 Page,
15