RENR9449-03April 2010

System 14: Combined Function

330D and 336D Excavator

Printed in U.S.A. 2010 Caterpillar, All Rights Reserved

336D MHPUHydraulic System - Attachment330D:GBC1-UPGGE1-UPTHJ1-UPLRM1-UPERN1-UPRAS1-UPT2Y1-UP

336D:JBF1-UPKDJ1-UPMYP1-UPDTS1-UPWET1-UP

336D: MHPUM3M1-UPM3N1-UP

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

R

E

N

R

9

4

4

9

-

0

3

2

4

P

a

g

e

,

(

D

i

m

e

n

s

i

o

n

s

:

3

4

i

n

c

h

e

s

x

2

8

i

n

c

h

e

s

)

Tap LocationsPressure and Sampling

TapNumber Description

SchematicLocation

AA Left Pump Delivery Pressure B-4BB Right Pump Delivery Pressure A-4 CC Pilot Pump Delivery Pressure A-5GG Pilot Pressure Pb1 (B1), Attachment F-2HH Pilot Pressure Pa1 (B2), Attachment F-2II Pilot Pressure bR2 (B3), Attachment F-2JJ Pilot Pressure aR2 (B4), Attachment F-2KK Right Pump Pilot Pressure E-1LL Left Pump Pilot Pressure E-1OO Pump Power Shift Pressure B-2

SOS Hydraulic Oil Sampling Port A-5

Description PartNumberMachineLocation

SchematicLocation

Accumulator Gp - Pilot Manifold 164-6981 1 B-5Cylinder Gp - Boom Note A 2 F-6Cylinder Gp - Bucket Note A 3 E-6Cylinder Gp - Stick Note A 4 F-6Filter Gp - Case Drain 126-2075 5 A-5Filter Gp - Pilot Hydraulic 158-8987 6 A-4Filter Gp - Return Oil 188-4140 7 B-7Motor Gp - Hydraulic Fan 234-4638 8 C-7Motor Gp - Left Travel 271-6376 9 F-4Motor Gp - Right Travel 271-6376 10 F-3Motor Gp - Swing 200-3373 11 F-8Pump Gp - Hydraulic Fan 259-0815 12 B-3Pump Gp - Main and Pilot 283-6116 13 B-2Sensor As - Left Pump Press. 221-8859 14 A-2Sensor As - Right Pump Press. 221-8859 15 B-2Switch As - Left Travel Pilot 167-3466 16 D-8Switch As - Pilot Pressure 167-3466 17 A-8

Switch As - Right Travel Pilot 167-3466 18 D-7

Swivel Gp 234-4440 19 E-3Tank As - Hydraulic Oil 239-1661 20 A-5Valve Gp - Check, Cooler Bypass 190-7745 21 C-7Valve Gp - Heavy Lift Solenoid 121-6303 28 A-4Valve Gp - Left Travel Counterbalance 204-2819 29 E-4Valve Gp - Load Control Boom Cylinder 255-5683 30 D-1Valve Gp - Load Control Stick Cylinder 255-5680 31 D-5Valve Gp - Main Control 285-1345 32 C-1 to C-7Valve Gp - Pilot Manifold 215-5037 34 B-5 to B-6Valve Gp - Pilot, Bucket and Boom 270-5952 35 B-7Valve Gp - Pilot, Stick and Swing 270-5951 36 B-8Valve Gp - Press. Red. Boom/ Swing 232-4102 37 B-4Valve Gp - Press. Red. Bucket/ Stick 232-4102 38 A-6Valve Gp - Pressure Relief 206-3354 39 A-6Valve Gp - Right Travel Counterbalance 204-2819 40 E-3Valve Gp - Shuttle 185-0462 41 A-8Valve Gp - Shuttle 259-7732 42 B-4Valve Gp - Swing Cushion 158-9090 43 E-8Valve Gp - Travel Pilot 270-5947 44 D-7

Valve Gp - Control, Auxiliary 259-7378 50 C-6Valve Gp - ECV, Check Solenoid 297-0370 51 F-5Valve Gp - ECV1, Check Solenoid 297-0370 52 E-5Valve Gp - ECV2, Check Solenoid 297-0370 53 F-5Valve Gp - ERV1, Sol. and Relief 244-8506 54 E-5Valve Gp - ERV2, Sol. and Relief 244-8506 55 F-5Valve Gp - Neg. Flow Control 171-0188 56 E-1Valve Gp - Work Tool, (4 Function) 259-7429 57 E-1

Note A: Refer to service manual for specific cylinder information.

Component Locations

Attachments

24

18

MACHINE COMPONENT LOCATIONS

179 21

3

35 2141

36

2

2

1143 1920

6577

10

214117

13 14 15

3230 31

2837

9 10

1413 15

20213635

3

111943

28 37

44

5

16

184416

29 40

29

40

6577

5

1

1 4

40

5452

5452

503856

39

SOS CC

6

5 7

13AA BB

34

34

50

42

54525355

51

57

56 LL KK

GG HH II JJ

OO

3230 31503856

39

MAIN AND PILOT PUMP GP

TAP LOCATIONS

13

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

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

SUPPLY LINE

DRAIN / RETURN LINE

RIGHT MAIN PUMP OUTPUT

RIGHT MAIN PUMP OUTPUT

LEFT & RIGHT MAIN PUMP POWERSHIFT CIRCUIT

PILOT PUMP OUTPUT

FAN PUMP AND CONTROL CIRCUIT

ATTACHMENT CONTROL CIRCUIT

BUCKET CYLINDER CONTROL CIRCUITRIGHT TRAVEL MOTOR CONTROL CIRCUIT

TRAVEL SPEED CONTROL CIRCUIT

STICK CYLINDER CONTROL CIRCUIT

BOOM CYLINDER CONTROL CIRCUIT

HEAVY LIFT CONTROL CIRCUIT

LEFT TRAVEL MOTOR CONTROL CIRCUIT

SWING MOTOR CONTROL CIRCUIT

SWING BRAKE CONTROL CIRCUIT

R

E

N

R

9

4

4

9

-

0

3

2

4

P

a

g

e

,

(

D

i

m

e

n

s

i

o

n

s

:

3

4

i

n

c

h

e

s

x

2

8

i

n

c

h

e

s

)

THIS SCHEMATIC IS FOR THE 330 AND 336D EXCAVATOR AND 336D MHPU HYDRAULIC SYSTEM ATTACHMENT: SYSTEM 14: COMBINED FUNCTIONMEDIA NUMBER: RENR9449-03 PART NUMBER: 255-5862, CHANGE: 02, VERSION: HEComponents 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

A

A

VALVE GPECV CHECK SOLENOID

297-0370

CC SOS

MOTOR GPSWING200-3373

VALVE GPECV2CHECK SOL297-0370

VALVE GPECV1 CHECK SOLENOID297-0370

VALVE GPERV1CHECK / RELIEF244-8506

VALVE GPERV2 CHECK / RELIEF

244-8506

MOTOR GPLEFT TRAVEL271-6376

VALVE GPLEFT TRAVEL

COUNTERBALANCE204-2819

MOTOR GPRIGHT TRAVEL271-6376

VALVE GPRIGHT TRAVELCOUNTERBALANCE204-2819

VALVE GPWORK TOOL4 - FUNCTION259-7429

VALVE GPNEGATIVE FLOW

CONTROL171-0188

PUMP GPMAIN / PILOT283-6116

PUMP GPHYDRAULIC FAN259-0815

SENSOR ASRIGHT PUMP221-8859

SENSOR ASLEFT PUMP221-8859

VALVE GPCONTROL AUXILIARY259-7378

VALVE GPMAINCONTROL 285-1345

FILTER GPPILOT HYDRAULIC158-8987

FILTER GPCASE DRAIN126-2075

VALVE GPHEAVY LIFTSOLENOID121-6303

VALVE GPPRESS REDUCING

BOOM / SWING232-4102

VALVE GPSHUTTLE259-7732

TANK ASHYDRAULIC239-1661

VALVE GPPRESSURE

RELIEF206-3354

VALVE GPPRESSURE REDUCINGBUCKET / STICK232-4102

SWITCH ASPILOT PRESSURE

167-3466

VALVE GPSHUTTLE184-0462

VALVE GPPILOT BUCKET / BOOM

270-5952

VALVE GPPILOT STICK / SWING

270-5951

VALVE GPCHECK COOLER BYPASS

190-7745

MOTOR GPFAN234-4638

FILTER GPRETURN OIL188-4140

ACCUMULATOR GPPILOT MANIFOLD164-6981

SWITCH ASLEFT TRAVEL

PILOT PRESSURE167-3466

SWITCH ASRIGHT TRAVELPILOT PRESS167-3466

VALVE GPSWING CUSHIONFINE SWING158-9090

VALVE GPTRAVEL PILOT270-5947

VALVE GPLOAD CONTROLSTICK CYLINDER255-5680

VALVE GPLOAD CONTROLBOOM CYLINDER255-5683

VALVE GPPILOT MANIFOLD215-5037

SWIVEL GP234-4440

P1 P2

B1 B2A1 A2

T

TRAVEL(L) TRAVEL(R)

T1 T5BACKFWDBACK FWD

T2 T4 T6 T3

JLP JLT

STICK SWING

OUTJL1

INJL3

R LJL2 JL4

BUCKET BOOM

OPEN CLOSE DOWN UPJR1JR2 JR3JR4

JRPJRT

Di2 Pi2 Pi3 Di3 DST Di1

T AL

4

a

L

4

SPiSDrSP3

Di4 Pi4 Pi1

BP3 BDr BPi BP2

R3aR5AR5

B

R

5

AR2BR2aL3

P

T

A1

A2

B1

B2

SINGLE

DOUBLE

SINGLE

DOUBLE

SWING MOTOR

P1 P2

B1 B2A1 A2

T

P2 Pi1

P1

DR1

DR2

DR3 DR4 DR5 DR6

P-IN

PSA1PSA2

T-OUT1

T

-

O

U

T

2

Pi2

FA1 FB1

DR

DR

INOUT

bR5

DR

A B

A B

P

A

T

Pi5

A B

TTTP

T

PG PC

P

A1A2A3A4 B4 B3 B2 B1

T

PAC

PP3 PP3

A B B A

T1T1

TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)

T2T2

G

F

SP2

AG AGBGBG

E

AG

DR

MU

BG AG

B A

RETURN CHECK VALVE

Pi1

Ps2

Pi2

D1

Ps1

S1

S

B

Dr1

Psv

a4a1

a3

L

a2a5

L1

M1

M2

A4

D0

A1 A2 A3 A4 A5 A6 A7 A8

B1 B2 B3 B4 B5 B6 B7 B8

STICKCYLINDER

BOOMCYLINDER

BUCKETCYLINDER

BOOMCYLINDER

aL1 bL1 bR1 aR1

BL2 AL2

N

O

.

1

(

T

R

A

V

E

L

)

N

O

.

2

(

S

W

I

N

G

)

N

O

.

3

(

L

O

C

K

)

AR3

AR4

aR4

BR3

aR3

aR2

bR2

aR1

BR1AR1

aL1

AL1

BL1

aL2

BL2

AL2

BL3 AL3

bL4 bL3 bL2 bL1 bR4bR3

BR4

bR1Pb1

Pa1

Pb1Pa1bR2aR2

R.C.V.-CR.C.V.-B

R.C.V.-A

R.C.V.-D

R.C.V.-C

R.C.V.-D

R.C.V.-B

R.C.V.-A

PL PR

PR

PL

HL HR

HRHL

DR A1B1

DRDR1 L2L3

AB

F2

S

T

I

C

K

(

2

)

B

O

O

M

(

1

)

A

T

C

H

B

U

C

K

E

T

T

R

A

V

E

L

(

R

)

T

R

A

V

E

L

(

L

)

S

W

I

N

G

S

T

I

C

K

(

1

)

B

O

O

M

(

2

)

(UP)

(OUT)

(IN)

(R)

(L)

(FWD)

(BACK)

(FWD)

(BACK)

(OPEN)

(CLOSE)

(UP)

(DOWN)

(OUT)

(IN)

STSP1

BL3BTBP1

BR4R2 R1

aR3-a aR4 bR3 bR4 bL3-a bL4 aL2bL2

AL3 BL3

AR3 BR3

AR4 BR4

BL1 AL1 BR1 AR1

R.C.V.:

HHIIJJ GG

LL

KK

AA

BB

OO

aR3-a bL3-a

aR3 bL3