FLUID POWER SYMBOLS
Component Locations
15
BASIC COMPONENT SYMBOLS MAIN AUX.
PUMP or MOTOR
aL5
aL4
bL3
aL2
bL1
bR1
bR2
aR3
aR4
Bpi
Api
BDr
ADr
LINE RESTRICTION (FIXED)
RESTRICTION
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
VALVES VALVE ENVELOPES
Pp1 Pp1
Pp2
VALVE PORTS
Pp2
PTA TWO POSITION
ONE POSITION
A
A
PSW
AL4 BL3
BL2
AR3
BL1
BR1
TWO-WAY
THREE POSITION
CONTROL VALVES
BR2
AR4
FOUR-WAY
THREE-WAY
CHECK VALVES
AB
AB
X dsW
BL4 dL5
AL3
AL2
AL1
AR1
AR2
PiL
P T SHIFTED POSITION
P T NORMAL POSITION
BR3
INFINITE POSITION
SHUTTLE
SPRING LOADED
BASIC SYMBOL
MEASUREMENT
PILOT CONTROLLED
ROTATING SHAFTS
dR5 APi2 HR
PRESSURE
FLOW
TEMPERATURE
UNIDIRECTIONAL
BIDIRECTIONAL
PL
HL
B
C
STICK (2) BOOM
PR
BUCKET
TRAVEL (R) ATT
STR TRAVEL SWING TRAVEL (L)
VIEW A-A
345C Excavator Hydraulic System
PAT
Dr
R3 TANK R1 bL4
aL3
bL2
aL1
dST1
aR1
aR2
R2
aR3
dR4
VIEW B
FLUID STORAGE RESERVOIRS
BOOM (2) STICK
VIEW C
VENTED
Main Control Valve
RETURN BELOW FLUID LEVEL
COMBINATION CONTROLS
KBA1-UP TBA1-UP MDC1-UP WDE1-UP GBH1-UP RFN1-UP DHP1-UP GJR1-UP JAR1-UP PJW1-UP BWY1-UP CPX1-UP
SOLENOID or MANUAL
SOLENOID
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
PUSH-PULL LEVER
GENERAL MANUAL
MANUAL SHUTOFF
PUSH BUTTON
PEDAL
SPRING
PILOT CONTROL SYMBOLS RELEASED PRESSURE
EXTERNAL RETURN
REMOTE SUPPLY PRESSURE
INTERNAL RETURN
SIMPLIFIED
CROSSING AND JOINING LINES
ACCUMULATORS
SPRING LOADED
GAS CHARGED
LINES CROSSING
HYDRAULIC PUMPS FIXED DISPLACEMENT
Note A: See the Parts manual for specific cylinder part number.
RETURN ABOVE FLUID LEVEL
PRESSURIZED
LINES JOINING
HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
INTERNAL SUPPLY PRESSURE
COMPLETE
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
Printed in U.S.A.
Electrical Symbols Table
7
Hydraulic Symbols (Electrical)
G Transducer (Fluid) Pi 2 DR6 T-OUT1
DR4
Transducer (Gas / Air)
Generator
Electric Motor
DR3
Pressure Switch (Adjustable)
8
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
9
T
Pressure Symbol
11 12 13 14
M
DR5
Pressure Switch
20 21 22
Temperature Symbol
Flow Symbol
Level Symbol
PAC
43
Wire Number Identification Codes
23
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard LOCK
SWING
Harness identification code This example indicates wire 135 in harness "AG".
TRAVEL
10
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14 325-PK Circuit Identification Number
DR1
25 26 32 28 29 33 30 36 38
Pi 1
PSA2 DR2
Wire Color
T-OUT2 PSA1
Wire Gauge
Previous Standard Wire Color
Wire
P2 P-IN
325-PK-14 B Circuit Number Identification
Pilot Manifold Control Valve
3 5
39 41 42 44
FLOW ALLOWED IN EITHER DIRECTION
Without Heavy Lift and Fine Swing © 2005 Caterpillar All Rights Reserved
17 18 19
TWO POSITION
THREE POSITION
INFINITE POSITIONING
4 6
1 2
Machine Component Locations
A
Wire Gauge (EXAMPLE VALVE)
30 Page, DGM
Accumulator Gp - Pilot Manifold Cooler Gp - Oil Cylinder Gp - Boom Cylinder Gp - Bucket Cylinder Gp - Stick Filter Gp - Return (Inside Hydraulic Tank) Filter Gp - Drain Return Filter Gp - Pilot Motor Gp - Cooling Fan Motor Gp - Left Swing Motor Gp - Left Travel Motor Gp - Right Swing Motor Gp - Right Travel Pump Gp - Cooling Pump Gp - Drive / Idler / Pilot Sensor Gp - Drive Pump Pressure Sensor Gp - Idler Pump Pressure Switch As - Implement Pressure Switch As - Travel Pressure Swivel Gp - Joint Tank Gp - Hydraulic Valve Gp - Boom / Swing Priority Valve Gp - Boom Drift Reduction Valve Gp - Check Boom / Stick 2 Valve Gp - Check Boom 2 Valve Gp - Check Cooler Bypass Valve Gp - Check Slow Return Valve Gp - Check Stick Valve Gp - Left Swing Motor Valve Gp - Left Travel / Brake Valve Gp - Lock Solenoid Valve Gp - Main Control Valve Gp - Pilot Control Bucket / Boom Valve Gp - Pilot Control Stick / Swing Valve Gp - Pilot Control Travel Valve Gp - Pilot Manifold Valve Gp - Power Shift Control Valve Gp - Right Travel / Brake Valve Gp - Stick Drift Reduction Valve Gp - Swing Brake Solenoid Valve Gp - Travel Speed Solenoid
11
RENR7356-01 February 2005
RENR7356-01
Description
Part Machine Schematic Number Location Location 164-6981 B-6 29 210-8164 B-8 22 Note A E-1 9 Note A E-2 8 Note A E-8 7 173-3434 A-5 and A-6 42 126-2075 A-4 and A-6 41 and 44 158-8987 A-4 39 242-6904 A-6 23 225-4506 F-7 1 232-6180 F-5 3 225-4506 F-6 2 232-6180 F-4 4 259-0814 B-1 32 259-0818 A-3 33 221-8869 B-2 36 221-8869 A-2 38 106-1079 D-3 13 106-1079 D-3 14 225-4547 E-5 10 227-0431 A-6 43 232-4102 B-4 31 153-5233 D-1 15 239-8902 D-1 12 239-8906 D-6 12 123-2505 B-8 21 185-0384 B-8 20 239-8904 D-5 12 107-7056 E-7 1 165-9338 E-5 5 121-1491 B-5 28 230-2760 D-1 12 232-4158 C-7 19 232-4157 C-8 18 165-9522 D-8 17 215-5037 B-6 30 225-4518 B-2 33 165-9338 E-4 6 153-5233 D-5 11 121-1491 B-6 26 121-1491 B-6 25