INTERACTIVE SCHEMATIC

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EC-C3EC-C2 E-C60

EC-C1

E-C61

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Hydraulic System330D and 336D Excavator

2008 Caterpillar, All Rights Reserved Printed in U.S.A.

RENR9926-02October 2008

330D:R2D1-UPMWP1-UP

336D:J2F1-UPW3K1-UP

COMPONENT LOCATION

Description PartNumberMachineLocation

SchematicLocation

Accumulator Gp - Hydraulic (Charged) 164-6981 1 B-5Cylinder Gp - Boom Note A 2 F-3

Note A 3 F-8Note A 4 F-8

Control Gp - Joystick (LH) 270-5951 5 C-8270-5952 6 C-7

Filter And Valve Gp - Pilot (Hydraulic Oil) 158-8987 7 A-5Filter Gp - Oil (Case Drain) 289-8194 8 A-5

188-4140 9 A-7Manifold Gp - Control (Pilot Oil Supply) 215-5037 10 B-6Motor Gp - Piston (Hydraulic Fan) 234-4638 11 A-8Motor Gp - Swing 200-3373 12 F-6Motor Gp - Travel (LH) 271-6376 13 F-5

271-6376 14 F-4Pump Gp - Piston (Main with Pilot Gear Pump) 283-6116 15 B-3Pump Gp - Piston (Hydraulic Fan) 259-0815 16 B-4Sensor As - Pressure (Pump Control, LH) 260-2180 17 A-2

260-2180 18 B-2Switch As - Pressure (Implement, Swing) 307-5769 19 B-8

307-5769 20 D-8307-5769 21 D-7

Swivel Gp 234-4440 22 E-5Tank Gp - Hydraulic 289-5565 23 A-6Valve Gp - Check (Oil Cooler Bypass) 190-7745 24 B-8Valve Gp - Load Control (Boom Drift Red, Line Relief) 255-5683 25 D-3

Stick Drift Red, Line Relief) 255-5680 26 D-6Valve Gp - Main Control (Heavy Lift) 285-1540 27 C-4Valve Gp - Pilot (Travel) 270-5947 28 E-8Valve Gp - Pressure Reducing (Boom / Swing) 310-0210 29 B-5Valve Gp - Shuttle ( 185-0462 30 B-8Implement, Swing)

Swing) 123-2430 31 B-5Valve Gp - Solenoid (Heavy Lift) 121-6303 32 A-5Valve Gp - Cushion Crossover Relief 158-9085 33 F-6Valve Gp - Swing Cushion (Fine Swing) ATCH 158-9090 34 F-7

Valve Gp - Travel Counterbalance (LH) 204-2819 35 E-5

Note A: Refer to Service Manual for specific cylinder information.

204-2819 36 E-4

Cylinder Gp - BucketCylinder Gp - Stick

Control Gp - Joystick (RH)

Filter Gp - Oil (Hydraulic Return)

Motor Gp - Travel (RH)

Sensor As - Pressure (Pump Control, RH)

Switch As - Pressure (Travel, LH)Switch As - Pressure (Travel, RH)

Valve Gp - Load Control (

Valve Gp - Shuttle (

Valve Gp - Travel Counterbalance (RH)

TAP LOCATION

TapNumber Description

SchematicLocation

AA Left Pump Delivery Pressure A-2BB Right Pump Delivery Pressure B-2CC Pump Power Shift Pressure A-2DD Pilot Pump Delivery Pressure A-5

SOS Hydraulic Oil Sampling Port A-4

FLUID POWER SYMBOLS

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 RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOID and PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit Number Identification

Wire Number Identification Codes

Current Standard

Previous Standard

Electrical Schematic Example Hydraulic Schematic Example

325-PK

Wire ColorCircuit Number Identification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer(Fluid)

Transducer(Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch (Adjustable)

Temperature Switch

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

T

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letterYY

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSRIGHT MAIN PUMP OUTPUTPILOT PUMP OUTPUTFAN PUMP AND CONTROL CIRCUITLEFT MAIN PUMP OUTPUTTRAVEL SPEED CONTROL CIRCUITLEFT TRAVEL MOTOR CONTROL CIRCUITSUPPLY LINEDRAIN / RETURN LINELEFT & RIGHT MAIN PUMP POWERSHIFT CIRCUITATTACHMENT CONTROL CIRCUITHEAVY LIFT CONTROL CIRCUITRIGHT TRAVEL MOTOR CONTROL CIRCUITSWING MOTOR CONTROL CIRCUITBOOM CYLINDER CONTROL CIRCUITBUCKET CYLINDER CONTROL CIRCUITSTICK CYLINDER CONTROL CIRCUIT

THIS SCHEMATIC IS FOR THE 330D and 336D EXCAVATORPART NUMBER: 259-7414, CHANGE: 01, VERSION: HEComponents are shown installed on a fully operable machine.

Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

TRAVEL(L) TRAVEL(R)

(28) VALVE GPPILOT (TRAVEL)

270-5947

(20) SWITCH ASPRESSURE(TRAVEL, LH)307-5769

(21) SWITCH ASPRESSURE(TRAVEL, RH)307-5769

T1 T5BACKFWDBACK FWD

T2 T4 T6 T3

JLPJLT

STICK SWING

OUTJL1

INJL3

R LJL2 JL4

BUCKET BOOM

OPEN CLOSE DOWN UPJR1JR2 JR3JR4

A1 A2 A3 A4 A5 A6 A7 A8

B1 B2 B3 B4 B5 B6 B7 B8

TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)

T1

Pp3Pp3

T1

ABA B

STICK(4) CYLINDER GP

BUCKET(3) CYLINDER GP

P2 Pi1

P1

DR1

DR2

DR3 DR4 DR5 DR6

P-IN PSA1PSA2

T-OUT1

T-OUT2

Pi2

Di2 Pi2 Pi3 Di3 DST bR2 Di1

T AL4 aL4

SPiSDr

SP3

Di4 Pi4 Pi1

BP3BDr

BPiBP2

R3aR5AR2BR2

aR2

BOOM(2) CYLINDER GP

SWING MOTOR

P1 P2

T

A1 A2B1 B2

aL3

(12) MOTOR GPSWING200-3373

(33) VALVE GPCUSHIONCROSSOVERRELIEF158-9085

(13) MOTOR GPTRAVEL (LH)271-6376

(14) MOTOR GPTRAVEL (RH)271-6376

(35) VALVE GPTRAVEL COUNTERBALANCE (LH)

204-2819

(36) VALVE GPTRAVEL COUNTERBALANCE (RH)

204-2819

(22) SWIVEL GP234-4440

(26) VALVE GPLOAD CONTROL

(STICK DRIFT RED, LINE RELIEF)

255-5680 (27) VALVE GPMAIN CONTROL (HEAVY LIFT)285-1540

(24) VALVE GPCHECK(OIL COOLER BYPASS)190-7745

(9) FILTER GPOIL(HYDRAULIC RETURN)188-4140

(30) VALVE GPSHUTTLE

(IMPLEMENT,SWING)

185-0462

(10) MANIFOLD GPCONTROL (PILOT OIL SUPPLY)215-5037

(23) TANK GPHYDRAULIC

289-5565

(29) VALVE GPPRESSURE REDUCING(BOOM / SWING)310-0210

(32) VALVE GPSOLENOID(HEAVY LIFT)121-6303

(7) FILTER AND VALVE GPPILOT

(HYDRAULIC OIL)158-8987

(8) FILTER GPOIL (CASE DRAIN)

289-8194

JRP

JRT

(5) CONTROL GPJOYSTICK (LH)

270-5951

(6) CONTROL GPJOYSTICK (RH)

270-5952

(1) ACCUMULATOR GPHYDRAULIC (CHARGED)

164-6981

bR5

INOUT

T

TTTP

PG PC

PAC

RETURN CHECK VALVE

Pi5

T2 T2

D E F

G

SP2

AG AGBGBG

BR5 AR5

P

A

T

PG

DR

MU

BG AG

(11) MOTOR GPPISTON

(HYDRAULIC FAN)234-4638

Pi1

Ps2

Pi2

D1

Ps1

S1

S

B

Dr1

Psv

a4a1

a3

L

a2

(15) PUMP GPPISTON

(MAIN WITH PILOT GEAR PUMP)

283-6116

a5

L1

(16) PUMP GPPISTON(HYDRAULIC FAN)259-0815

M1

M2

A4

D0

(31) VALVE GPSHUTTLE (SWING)123-2430

B A

aL1 bL1 bR1 aR1

AL3 BL3

AR4 BR4

AR3 BR3

AL2BL2

aR3 aR4 bR3 bR4 bL3 bL2 bL4 aL2

bL3 bL2 bL1bR1

bR3 bR4

BL3 AL3

AL1AL2

BL1BL2

aL2

aR1

AR1

BR1 AR3BR3

BR4

AR4aL1

aR3 aR4

NO

.1

(TR

AVE

L)

NO

.2(S

WIN

G)

NO

.3(L

OC

K)

bL4

AR1BR1AL1BL1

R.C.V-C

R.C.V-B

R.C.V-A

R.C.V-A

R.C.V-B

R.C.V

R.C.V-C

PRPL

PL

PR

HR

HR

HL

HL

DRDR1 L2L3

AB

STI

CK

(2)

BO

OM

(1)

ATC

H

BU

CK

ET

TRAV

EL(

R)

TRAV

EL(

L)

SW

ING

STI

CK

(1)

BO

OM

(2)

(UP)

(OUT)

(IN)

(R)

(L) (BACK)

(FWD)

(BACK)

(OPEN)

(CLOSE)

(UP)

(DOWN)

(OUT)

(IN)BT

BP1

BR4

SP1ST

BL3 R1R2

(25) VALVE GPLOAD CONTROL

(BOOM DRIFT RED, LINE RELIEF)

255-5683

BB

CC

AA

DD SOS

(19) SWITCH ASPRESSURE

(IMPLEMENT, SWING)307-5769

(18) SENSOR ASPRESSURE(PUMP CONTROL, RH)260-2180

(17) SENSOR ASPRESSURE(PUMP CONTROL, LH)260-2180

B1 A1

(34) VALVE GPSWING CUSHION

(FINE SWING) ATCH158-9090

B A

DR A1B1F8

E8

D8

C8

B8

A8

F7

E7

D7

C7

B7

A7

F6

E6

D6

C6

B6

A6

F5

E5

D5

C5

B5

A5

F4

E4

D4

C4

B4

A4

F3

E3

D3

C3

B3

A3

F2

E2

D2

C2

B2

A2

F1

E1

D1

C1

B1

A1

MACHINE COMPONENT LOCATIONS

36

36

35

35

34

34

33

33

32

32

31

31

30

30

29

29

28

28

27

27

26

26

25

25

24

24

23

23

22

22

21

21

20

20

19

19

18

18

17

17

14

14

13

13

12

12

11

11

10

10

6

6

5

5

4

4

3

2

2

2

1

1

MAIN PUMP COMPARTMENT

AABB

CC DD

SOS

16 15

98

7

FeaturesCover PageInformationComponent LocationTap LocationFluid Power SymbolsElectrical Symbols

SchematicMachine ViewsMachine Component LocationsMain Pump Compartment

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f_08_grid:

a_05_grid:

b_08_grid:

b_05_grid:

e_05_grid:

f_06_grid:

a_02_grid:

b_02_grid:

a_06_grid: a_07_grid: a_08_grid: b_03_grid: b_04_grid: b_06_grid: c_04_grid: c_07_grid: c_08_grid: d_03_grid: d_06_grid: d_07_grid: d_08_grid: e_04_grid: e_08_grid: f_03_grid: f_04_grid: f_05_grid: f_07_grid: 003_f_08_grid_v01: 010_b_06_grid_v01:

023_a_06_grid_v01:

030_b_08_grid_v01:

001_b_05_grid_v01:

002_f_03_grid_v01:

004_f_08_grid_v01:

025_d_03_grid_v01:

031_b_05_grid_v01:

035_e_05_grid_v01:

026_d_06_grid_v01:

029_b_05_grid_v01:

024_b_08_grid_v01:

027_c_04_grid_v01:

036_e_04_grid_v01:

032_a_05_grid_v01:

033_f_06_grid_v01:

034_f_07_grid_v01:

011_a_08_grid_v01:

017_a_02_grid_v01:

018_b_02_grid_v01:

013_f_05_grid_v01:

014_f_04_grid_v01:

022_e_05_grid_v01:

012_f_06_grid_v01:

019_b_08_grid_v01:

020_d_08_grid_v01:

021_d_07_grid_v01:

028_e_08_grid_v01:

005_c_08_grid_v01:

006_c_07_grid_v01:

a_04_grid: 041_a_04_grid_v02: 037_a_02_grid_v02: 038_b_02_grid_v02: 040_a_05_grid_v02: 039_a_02_grid_v02: 008_a_05_grid_v02: 009_a_07_grid_v02: 007_a_05_grid_v02: 015_b_03_grid_v02: 016_b_04_grid_v02: 0001_grid_spacer: restore_callouts: