RENR7366-02March 2012

385C ExcavatorHydraulic SystemEDA1-UPKGB1-UPKBC1-UPSBE1-UPT2E1-UPKKK1-UPJCM1-UPMNZ1-UP

Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved

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)

PUMP(2 - SECTION)

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

PRESSURECOMPENSATION

PUMP(VARIABLE & PRESSURE

COMPENSATED)

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVE ENVELOPES VALVE PORTS

FLUID CONDITIONERPUMP OR MOTOR

FLUID POWER SYMBOLS

UNIDIRECTIONAL

BIDIRECTIONAL

RELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED

HYDRAULIC PUMPS

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID &PILOT OR MANUAL

SOLENOID SERVO THERMAL DETENT

HYDRAULIC & PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

2 POSITIONINFINITE

POSITIONING

FLOW IN ONEDIRECTION

FLOW INEITHER

DIRECTION

3 POSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

MAIN AUX

LINE RESTRICTION(VARIABLE & PRESSURE

COMPENSATED)

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FLUID STORAGE RESERVOIRS

CROSSING & JOINING LINES

VALVES

PILOT CONTROL SYMBOLS

COMBINATION CONTROLS

BASIC COMPONENT SYMBOLS

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

INTERNALSUPPLY PRESSURE

COMPLETE

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

HYDRAULIC SYMBOLS (ELECTRICAL)

ELECTRICAL SYMBOLS TABLE

325-AG135 PK-14

HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS “AG”

325-PK-14

WIRE GAUGE

WIRE COLOR

CIRCUIT NUMBERIDENTIFICATION

WIRE NUMBER IDENTIFICATION CODES

CURRENT STANDARD

PREVIOUS STANDARD

ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE

325-PK

WIRE COLORCIRCUIT NUMBER

IDENTIFICATION

B

WIRE

WIRE

(EXAMPLE VALVE)

CURRENT STANDARD

TRANSDUCER(FLUID)

MELECTRIC MOTORTRANSDUCER

(GAS / AIR)

G

GENERATOR

PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH(ADJUSTABLE)

TEMPERATURESWITCH

PRESSURESWITCH

TEMPERATURESWITCH

LEVELSWITCH

FLOWSWITCH

ELECTRICAL SYMBOLS (ELECTRICAL)

A

CIRCUIT NUMBERIDENTIFICATION

WIRECOLOR

WIRE GAUGE

T

RE

NR

7366-0

22

4 P

ag

e,

(Dim

en

sio

ns

: 3

4 i

nc

he

s x

28

in

ch

es

)

Description PartNumber

MachineLocation

SchematicLocation

Accumulator & Mtg Gp - Hydraulic (Pilot) 160-4138Accumulator Gp - Hydraulic 215-4905

Filter Gp - Oil 185-0336259-06816E-5534234-4454

Motor Gp - Piston (HYdraulic Oil Cooler Fan) 247-8978Motor Gp - Piston (Hydraulic Oil Cooler) 225-4614Motor Gp - Piston (Travel) 209-5895Motor Gp - Swing (Front) 234-4535Motor Gp - Swing (Rear) 234-4537Pump - Gp - Piston (Main Hydraulic) 155-9205Pump Gp - Gear (Pilot) 155-9222Pump Gp - Piston (Fan Motor) 170-9918Pump Gp - Piston (Swing) 259-0784Sensor As - Pressure (Swing Pump) 221-8869

Swivel Gp 156-0622Valve Gp - Check (Hydraulic Fan Motor, Radiator) 173-3429Valve Gp - Check (Return) 201-9381

201-9382Valve Gp - Control (Swing) 241-8929Valve Gp - Main Control 230-0080Valve Gp - Manifold & Reducing (Pilot Oil) 140-0736Valve Gp - Swing Cushion 241-8929Valve Gp - Travel Counterbalance 155-9200

12

678910111213141516171819

212223242526272829

E-3C-7

B-7A-7

A-6, A-7B-7B-6B-6

F-4, F-5F-2F-3

A-4, A-5A-3A-3

A-2, A-3B-3

E-5B-6C-1C-7E-3

C-1 Thru C-7D-4E-3

E-4, E-5

Component Locations

11

7

2210

2912

2514

1328

21271

24

1719

1618 15

2068

1229

9

1719

1618

1522

1020

86

2

72514

1328

2111

127

1229

924 26

97

1

27

26

27

BB

CC

19

18

17

16

SOS

PILOT / FAN / SWING PUMPS

AA

Tap LocationsPressure, Sampling, and Sensor

TapNumber Description Schematic

LocationAA Pilot Manifold Pressure D-3BB Pilot Pump Delivery Pressure B-3CC Swing Pump Delivery Pressure B-3DD Front Pump Delivery Pressure B-5EE Rear Pump Delivery Pressure B-4

SOS Hydraulic Oil Sampling Port B-3

A

A

EE DD

20

15

17Sensor As - Pressure (Main Pump) 221-8869 20 B-5

2326

2

23

Cylinder Gp - Boom Note A 3 F-6Cylinder Gp - Bucket Note A 4 F-7Cylinder Gp - Stick Note A 5 F-7

NOTE A: Check the parts manual for the correct cylinder part number.

3

3

5

4

3 5

4

COMPONENT LOCATIONS FILTER GP

VALVE GP - MANIFOLD & REDUCING

PUMP GP MAIN HYDRAULIC

VIEW A

15

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)

Components (By number)

YY

52

DRAIN / RETURN TO TANK

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSMAIN PUMP OUTPUT

SWING PUMP OUPUT

PILOT PUMP OUTPUT

RIGHT HAND TRAVEL MOTOR CONTROL CIRCUIT

FAN PUMP OUTPUT

MAIN PUMP LOAD SENSE PRESSURE

SWING BRAKE CONTROL CIRCUITDRAIN / RETURN TO SUPPLY

MAIN PUMP LOAD SENSE CIRCUITSUPPLY LINE

BUCKET CONTROL CIRCUIT

TRAVEL SPEED CONTROL CIRCUIT

STICK CYLINDER CONTROL CIRCUITLEFT HAND TRAVEL MOTOR CONTROL CIRCUIT

BOOM CYLINDER CONTROL CIRCUIT

SWING MOTOR CONTROL CIRCUIT

RE

NR

7366-0

22

4 P

ag

e,

(Dim

en

sio

ns

: 3

4 i

nc

he

s x

28

in

ch

es

)

THIS SCHEMATIC IS FOR THE 385C EXCAVATORRENR7366-02 PART NUMBER: 225-4836, CHANGE: 04, VERSION: VComponents are shown installed on a fully operable machine.

Refer to the appropriate Service Manual for Troubleshooting, Specifications.

A

B

C

D

E

F

1234567

A

B

C

D

E

F

1234567

MOTOR GPRH TRAVEL209-5895

TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)

SWING MOTOR (REAR) SWING MOTOR (FRONT)

SENSOR AS.MAIN PUMP221-8869

PUMP GPMAIN HYDRAULIC155-9205

SENSOR AS.SWING PUMP221-8869

PUMP GPGEAR(PILOT)155-9222

PUMP GPPISTON(FAN MOTOR)170-9918

PUMP GPPISTON(SWING)259-0784

SWIVEL GP156-0622

ACCUMULATOR GP160-4138

VALVE GPPILOT MANIFOLD& REDUCING140-0736

VALVE GPMAIN CONTROL230-0080

FILTER GPPILOT OIL185-0336

VALVE GPCHECK201-9381

VALVE GPCHECK(RETURN)201-9382

FILTER GPRETURN259-0681

FILTER GPRETURN234-4454

FILTER GPCASE DRAIN6E-5534

MOTOR GPHYDRAULICOIL COOLERFAN247-8978

VALVE GPCHECK173-3429

MOTOR GPPISTON(HYDRAULICOIL COOLER)225-4614

ACCUMULATOR GP215-4905

Pi6

Pi5 Pi4 Pi3

Pi2 Pi1

PS

A4

PS

A3

PS

A2

PS

A1

PAC

PG

DR

1

DR

2

DR

3

DR

4

DR

5

DR

6

PIN

TOU

T

Qmax Qmin

AS R T1 T2

L1

L2

M1SDRDR1S

A

MG

PS1 a1 P1 P2 a2PSg

LS2

D2B1D1

LS1

PF PR

BL1AL1 AR1

BR1

PF

PR

BR1 AR1 BL1 AL1

L2

L3

DR

DR1

A

B

DRDR1

L2

L3

B

A

FWD

FWD

IN

RE

V

RE

V

OU

TS

TIC

K

TRAV

EL(

L)

TRAV

EL(

R)

CLO

SE

UP

OP

EN

DO

WN

BO

OM

BU

CK

ET

ATC

H

LS

bL1bR1aL4

aL1aR1bL4

DR4DR5

R2

DR3

PS3

DR1aR3aL3aL2

bR3bL3bL2R1

DR2

PS2

DR4PS4

BL2 AL2

PRPD

PG1 PG2

DB

PB

M

B A

PA

M1 M2

SDr1

SP

T P SDr2

R

M

PAPB

PG DB

Pi

Dr

Dr

BG

BA

AG

Pi

PG

A B

P

Pi

Dr

Dr

BG

B A

AG

Pi

P

PG

B A

MOTOR GPLH TRAVEL209-5895

VALVE GPRH TRAVELCOUNTERBALANCE155-9200

VALVE GPLH TRAVELCOUNTERBALANCE155-9200

MOTOR GPSWING (REAR)234-4537

MOTOR GPSWING (FRONT)234-4535

VALVE GPSWING CUSHION116-3420

VALVE GPCONTROL(SWING)241-8929

AA

BB

SOSCC

EEDD

STICK CYLINDERBUCKET CYLINDER BOOM CYLINDER

AR3 BR3AL4 BL4BL3 AL3

AL4BR3

BL4AR3