©2004 Caterpillar

All Rights Reserved

Printed in U.S.A.

SENR6188-02

July 2004

315 and 315 L Excavators

4YM1-UP

315:

Hydraulic System

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION

(FIXED)

2-SECTION PUMP

MAIN AUX.

SPRING

(ADJUSTABLE)

VARIABILITY LINE RESTRICTION

(VARIABLE)

LINE RESTRICTION

(VARIABLE and PRESSURE COMPENSATED)

PRESSURE

COMPENSATION

PUMP: VARIABLE and

PRESSURE COMPENSATED

ENERGY TRIANGLES

HYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FLUID POWER SYMBOLS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNAL

SUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID

or MANUALSOLENOID

and PILOT

SOLENOID and

PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASIC SYMBOL SPRING LOADED

CHECK VALVES

TWO

POSITION

INFINITE

POSITIONING

FLOW IN ONE

DIRECTION

FLOW ALLOWED IN

EITHER DIRECTION

THREE

POSITION

CROSS

FLOWPARALLEL

FLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P T

SHIFTED POSITION INFINITE POSITION

CONTROL VALVES

6XM1-UP

1

2103

45

7 8 96

Main Control Valve

D03593

DR4

DR3

Pi8

C/V

SD1

SP1

Pi1

PSA PG

E-3

PIN

Pi3TOUT

Pi5

JPd JPi

DR2

DR5

PAC

DR1

E-2

5

2

1

3

4

6

Pilot Manifold

D03567

Schematic

315 L:

7NM1-UP

8LM1-UP

6YM1-UP

Item No.

1

2

3

4

5

6

7

8

9

10

Standard Components

Component

Main Hydraulic Control Valve

Boom II Control Valve

Stick I Control Valve

Swing Control Valve

Left Travel Control Valve

Right Travel Control Valve

Attachment Control Valve

Boom I Control Valve

Bucket Control Valve

Stick II Control Valve

Item No.1

2

3

4

5

6

7

Components

Standard Components

Pilot Manifold

Accumulator

Solenoid Valve - Pump

Solenoid Valve - Swing

Solenoid Valve - Travel

Solenoid Valve - Fine Control

Relief Valve - Pilot Pressure

Hydraulic Schematic

MAIN CONNECTOR LINE

PILOT LINE

DRAIN LINE

104-9165

SWING STICK

BOOMBUCKET

SWING

MOTOR

(REAR)(FRONT)

a1a2

Ps

T1

R/G R/G

T1

Ps

a2a1

P2P1 P1P2

PiS

BR2AR2

JR1JR3

JR2JR4

JRTJRP

JL2JL4

JL3JL1

JLTJLP

TRA2

TRA1

TLA2

TLA1

TTTP

aL5AL4

ST

SA5 SA4 SA3 SA2 SA1

SB5 SB4 SB3 SB2 SB1

SP

PG

SH

Dr

AB

BL4bL4 HL

DO A3B2DIB1Dr

Pi2Pi1

A2a3a2PHa1PfA1

MU

BR4

bR3BR3AR3

bR4

aR4HR

R1

BL3AL3AL2BL2bL2AL1BL1bL1dST1bR1

dR4

BR1AR1bR2

aR3 Y

dL6

R2

X

dSP PSW PTA aR2 aR1 PR PL aL1 PPPAT

aL2 aL3

bL3

dL5

PEU

C/V

Pi8

Pi5

JPi

PIN

PG

TOUT

DR6

DR5

DR4

DR3

DR2

DR1

Pi3

Pi2

Pi1

PSAPAC

aL4

g01090534

2

TRAVELTRAVEL(L) (R)

3