SENR6674 November 1993
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN
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)
ATTACHMENT
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
VALVE PORTS
THREE POSITION
TWO - WAY
THREE - WAY
CONTROL VALVES AB
PUMP (2 - SECTION)
VALVES
VALVE ENVELOPES
ONE POSITION
RESTRICTION
AUX
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
960F Wheel Loader Hydraulic System
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
ROTATING SHAFTS
MEASUREMENT
PRESSURE
9ZJ1-UP 4CL1-UP 6XL1-UP
TEMPERATURE
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
SERVO
THERMAL
DETENT
MANUAL CONTROL SYMBOLS
MANUAL SHUTOFF
PUSH - PULL LEVER
GENERAL MANUAL
EXTERNAL RETURN
INTERNAL RETURN
GAS CHARGED
COMPLETE
VARIABLE DISPLACEMENT NON-COMPENSATED
FIXED DISPLACEMENT
SINGLE ACTING
LINES JOINING
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS INFINITE POSITIONING
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
HYDRAULIC MOTORS
HYDRAULIC PUMPS
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
2 POSITION
FLOW IN EITHER DIRECTION
Printed in U.S.A.
ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)
G TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
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
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE 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
WIRE GAUGE
A
(EXAMPLE VALVE)
12 Page,
TRANSDUCER (FLUID)
(Dimensions: 25 inches x 24 inches)
M
SENR6674
© 1993 Caterpillar, All Rights Reserved
SIMPLIFIED
LINES CROSSING
SPRING
REMOTE SUPPLY PRESSURE
CROSSING & JOINING LINES
ACCUMULATORS
FIXED DISPLACEMENT
PEDAL
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
SPRING LOADED
PUSH BUTTON