Caterpillar

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RENR9044-01 July 2007

FLUID POWER SYMBOLS
BASIC COMPONENT SYMBOLS
MAIN AUX.

PUMP or MOTOR

FLUID CONDITIONER

SPRING

CONTROL VALVES

RESTRICTION

LINE RESTRICTION (FIXED)

2-SECTION PUMP

PUMP: VARIABLE and PRESSURE COMPENSATED

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION(VARIABLE)

PRESSURE COMPENSATION

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

LINE RESTRICTION
VARIABLE and PRESSURE COMPENSATED

ATTACHMENT

DD
7

SOS 1

EE

VALVE ENVELOPES

VALVES

VALVE PORTS

ONE POSITION

TWO POSITION

THREE POSITION

TWO-WAY

THREE-WAY

FOUR-WAY

CONTROL VALVES
AB AB

CHECK VALVES

12

P T NORMAL POSITION

P T SHIFTED POSITION

INFINITEPOSITION

BASIC SYMBOL

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

10

VENTED

PRESSURIZED

RETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

18
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24M Motor Grader Hydraulic System
B9K1-UP

MEASUREMENT

ROTATING SHAFTSPRESSURE

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

SOLENOID

SOLENOID or MANUAL

SOLENOID and PILOT

SOLENOID and PILOT or MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

PUSH-PULL LEVER

MANUAL SHUTOFF

GENERAL MANUAL

PUSH BUTTON

PEDAL

SPRING

RELEASED PRESSURE

PILOT CONTROL SYMBOLS

REMOTE SUPPLY PRESSUREEXTERNAL RETURN

INTERNAL RETURN

SIMPLIFIED

COMPLETE

INTERNAL SUPPLY PRESSURE

ACCUMULATORS

CROSSING AND JOINING LINES

HYDRAULIC AND PNEUMATIC CYLINDERS

SPRING LOADED

GAS CHARGED

LINES CROSSING

LINES JOINING

SINGLE ACTING

DOUBLE ACTING

HYDRAULIC PUMPS

HYDRAULIC MOTORS
FIXED DISPLACEMENT VARIABLE DISPLACEMENT NON-COMPENSATED

INTERNAL PASSAGEWAYS
INFINITEPOSITIONING THREE POSITION TWO POSITION

12

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

42

20 25

18 34

3

21 43

1 2

22 23 35 37 38 40 41

4

13

30 39
Volume 1 of 2

BIDIRECTIONAL

BIDIRECTIONAL

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

FLOW ALLOWED IN EITHER DIRECTION

COMPONENT LOCATIONSComponent Locations (Volume 1)
Description
Accumulator Gp - LH Blade Cushion Accumulator Gp - RH Blade Cushion Cylinder Gp - Articulation Cylinder Gp - Blade Tip Cylinder Gp - Center Shift Cylinder Gp - LH Blade Lift Cylinder Gp - LH Steering Cylinder Gp - LH Wheel Lean Cylinder Gp - RH Blade Lift Cylinder Gp - RH Steering Cylinder Gp - RH Wheel Lean Cylinder Gp - Ripper Cylinder Gp - Side ShiftFilter Gp - Case Drain Filter Gp - Pilot Filter Gp - Return Filter Gp - Return Manifold Gp - Pilot Shutoff Solenoid Motor Gp - Circle Drive Pump Gp - Implement & Steering Pump Gp - Secondary Steering Screen - Left Implement Control Valve Screen - Right Implement Control Valve Screen - Steer Pilot Manifold Valve Sensor Gp - Pressure (Implement Pump) Switch As - Pressure (Case Drain Filter Bypass)Switch As - Pressure (Pilot Filter Bypass) Switch As - Pressure (Return Filter Bypass) Switch As - Pressure (Return Filter Bypass) Swivel Gp Tank Gp - Hydraulic Oil Valve - Shuttle (Load Signal Resolver) Valve Gp - Breaker Relief Valve Gp - Check Valve Gp - Check (Center Shift Cylinder) Valve Gp - Check (Implement / Steer) Valve Gp - Check (LH Blade Cylinder) Valve Gp - Check (RH Blade Cylinder)Valve Gp - Circle Flow Divider Valve Gp - Left Implement Control Valve Gp - Right Implement Control Valve Gp - Ripper Sequence Valve Gp - Secondary Steering Control Valve Gp - Steering Control Valve Gp - Steering Pilot Manifold Valve Gp - LH Constant Force Valve Gp - RH Constant Force

PILOT SHUT OFF MANIFOLD

© 2007 Caterpillar All Rights Reserved

Printed in U.S.A.

Part Number
219-8035...