Plano

D

2

68

45 46

48 23 M

A 39

Machine Location Item Number 1, 56 3 4 5 11, 67 13 14 17 18 19 20 26 27 36 46 48 62 64 78 79 B C

Brake Actuation Hydraulic System Component Description Service and Parking Brake (Rear) Traction Control Valve Brake Accumulator (Service) Brake Valve (Chassis) Service and Parking Brake (Front) Secondary Brake Control Service Brake Control Relay Valve(Service Brake/Retarder) Brake Accumulator (Parking) Relay Valve (Parking Brake) Hydraulic Filter (Brake Actuation) Brake Valve (Cab) Sequence Valve Electric Drive Pump (Parking and Secondary Brake Release) Gear Pump (Brake Actuation and Rear Axle Motor Drive) Pump Drive Hydraulic Tank Breather Hydraulic Tank Slack Adjuster (Rear) Slack Adjuster (Front) Pressure Tap (Brake Actuation Pump) PressureTap (Parking Brake Accumulator)

Schematic Location F-8, A-8 F-7 E-5, D-4 B-6 F-1, B-1 E-2 E-5 E-3 D-3 C-2 B-5 E-5 E-2, E-7 B-2 A-5 B-6 C-3 B-2 C-7 C-1 B-7 B-8

RENR2587-01 February 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 andPRESSURE COMPENSATED

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

LINE RESTRICTION
VARIABLE and PRESSURE COMPENSATED

ATTACHMENT

VALVE ENVELOPES

VALVES

VALVE PORTS

ONE POSITION

TWO POSITION

THREE POSITION

TWO-WAY

THREE-WAY

FOUR-WAY

CONTROL VALVES
AB AB

CHECK VALVES

P TNORMAL POSITION

P T SHIFTED POSITION

INFINITE POSITION

BASIC SYMBOL

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

VENTED

PRESSURIZED

RETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

55 32 34
Machine Location Item Number 1, 56 6 11, 67 21 24 25 28 35 40 41 43 47 48 62 64 65 E G K N J 81 82 Hoist and Brake Cooling Hydraulic System ComponentDescription Service and Parking Brake (Rear) Hoist Cylinders Service and Parking Brake (Front) Diverter Valve (Rear Brake Cooling) Gear Pump (Hoist and Brake Cooling) Oil Coolers (Rear Brake) Hoist Screens Hydraulic Filter (Front Brake Cooling) Control Valve (Hoist and Brake Cooling) Oil Coolers (Front Brake) Piston Motor (Brake Cooling Pump Drive) Piston Pump (Brake Cooling Motor Drive) Pump DriveHydraulic Tank Breather Hydraulic Tank Gear Pumps (Brake Cooling) Sampling Valve (Rear Brake Cooling Oil) Auxiliary Power Unit Port (Hoist System) Sampling Valve (Front Brake Cooling Oil) Pressure Tap (Hoist) Pressure Tap (Hoist) Screen Screen Schematic Location F-7, B-8 E-2 F-2, C-1 C-7 C-4 B-6 D-5 D-1 F-6 D-2 A-3 B-4 C-6 C-4 C-3 A-3 E-3 D-6 D-5 B-2 C-3

797B Off-Highway Truck HydraulicSchematic
JSM1-219

MEASUREMENT

ROTATING SHAFTS

PRESSURE

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

SOLENOID

SOLENOID or MANUAL

SOLENOID and PILOT

SOLENOID and PILOT or MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

54

PUSH-PULL LEVER

MANUAL SHUTOFF

GENERAL MANUAL

PUSH BUTTON

PEDAL

SPRING

RELEASED PRESSUREPILOT CONTROL SYMBOLS

REMOTE SUPPLY PRESSURE

EXTERNAL 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
FIXED DISPLACEMENT VARIABLE DISPLACEMENTNON-COMPENSATED

HYDRAULIC MOTORS
FIXED DISPLACEMENT VARIABLE DISPLACEMENT NON-COMPENSATED

INTERNAL PASSAGEWAYS
INFINITE POSITIONING THREE POSITION TWO POSITION

UNIDIRECTIONAL

UNIDIRECTIONAL
CROSS FLOW

F05779

BIDIRECTIONAL

BIDIRECTIONAL

FLOW IN ONE DIRECTION

PARALLEL FLOW

FLOW ALLOWED IN EITHER DIRECTION

REAR AXLE HYDRAULIC COMPONENTS

© 2007 Caterpillar All Rights...