SENR1213-03 July 2011
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)
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
416C, 426C & 436C Backhoe Loader Hydraulic and Steering Systems
PRESSURE
TEMPERATURE
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
436C: 8TN1-UP 9JN1-UP 1FR1-UP 1PR1-UP 1RR1-UP 2AR1-UP 2BR1-UP
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
SPRING LOADED
INTERNAL RETURN
PEDAL
SIMPLIFIED
LINES CROSSING
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
SPRING
REMOTE SUPPLY PRESSURE
CROSSING & JOINING LINES
GAS CHARGED
FIXED DISPLACEMENT
PUSH BUTTON
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
ACCUMULATORS
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
M
TRANSDUCER (FLUID)
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)
(Dimensions: 34 inches x 24 inches)
© 2011 Caterpillar, All Rights Reserved
RETURN BELOW FLUID LEVEL
ROTATING SHAFTS
16 Page,
426C: 6XN1-UP 7WN1-UP 1CR1-UP 1ER1-UP 1MR1-UP 1NR1-UP 1YR1-UP 1ZR1-UP
RETURN ABOVE FLUID LEVEL
MEASUREMENT
SENR1213-03
416C: 5YN1-UP 4ZN1-UP 1WR1-UP 1XR1-UP
PRESSURIZED
VENTED