8/20/2019 Ciurcuito Hidraulico de Excavadora 320D

1/2

320D and 323D Excavator 

Hydraulic System323D MHPU

323D:NZF1-UP

323D MHPU:L5Z1-UP

320D:JZA1-UPMZD1-UPKZF1-UP

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

UENR2474-01

January 2012

O N E PO S IT I ON T W O P O SI T IO N T HR E E PO S IT I ON

V EN TE D P RE SS UR IZ ED R ET UR NA BO VE FL UI DL EV EL R ET UR NB EL OW FL UI DL EV EL

L I NE S C RO S SI N G L I NE S J OI N IN G

TWO - WAY TH RE E- WAY FO UR - WAY

S P RI N G C O NT R OL V A LV E S R E ST RI C TI O N L I NE R E ST RI C TI O N(FIXED)

PUMP(2 - SECTION)

SPRING(ADJUSTABLE)

V AR IA BI LI TY L IN ER ES TR IC TI ON(VARIABLE)

PRESSURECOMPENSATION

 PUMP(VARIABLE&PRESSURE

  COMPENSATED)

MEASUREMENT

PR ES SUR E TE MP ERAT URE FL OW

ROTATING SHAFTS

U NI DI RE CT IO NA L B ID IR EC TI ON AL

PUSH - PULL LEVER PEDALGENERAL MANUAL PUSHBUTTON SPRING

FIXEDDISPLACEMENT

VARIABLEDISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVE ENVELOPES VALVE PORTS

FLUIDCONDITIONERPUMPORMOTOR

FLUID POWER SYMBOLS

UNIDIRECTIONAL

BIDIRECTIONAL

RELEASEDPRESSURE

E XT ER NA L RE TU RN I NT ER NA L RE TU RN

REMOTESUPPLYPRESSURE

SIMPLIFIED

HYDRAULICPUMPS

ACCUMULATORS

S P RI N G L O AD E D G A S CH A RG E D

SOLENOIDOR MANUAL

SOLENOID&PILOT

SOLENOID&PILOTORMANUAL

SOLENOID SERVO THERMAL DETENT

HYDRAULIC&PNEUMATICCYLINDERS

DOUBLEACTINGSINGLEACTING

BASICSYMBOL

SPRINGLOADED

CHECKVALVES

2 POSITIONINFINITE

POSITIONING

FLOWINONEDIRECTION

FLOW INEITHER

  DIRECTION

3 POSITION

CROSSFLOW

PARALLELFLOW

INTERNALPASSAGEWAYS

NORMALPOSITION

 AB

P T

 AB

P T

SHI FTEDPOSI TI ON I NFINI TEPOSI TION

CONTROLVALVES

 ATTACHMENT

MANUALSHUTOFF

S HUT TL E P ILO TCONTROLLED

MAIN AUX

LINERESTRICTION(VARIABLE&PRESSURE

COMPENSATED)

MANUALCONTROLSYMBOLS

HYDRAULICMOTORS

FLUIDSTORAGERESERVOIRS

CROSSING &JOINING LINES

VALVES

PILOT CONTROLSYMBOLS

COMBINATIONCONTROLS

BASICCOMPONENT SYMBOLS

ENERGYTRIANGLESHYDRAULIC PNEUMATIC

INTERNALSUPPLYPRESSURE

COMPLETE

FIXEDDISPLACEMENT

VARIABLEDISPLACEMENTNON-COMPENSATED

HYDRAULICSYMBOLS(ELECTRICAL)

ELECTRICAL SYMBOLS TABLE

325-AG135 PK-14

HARNESSIDENTIFICATIONCODE THISEXAMPLEINDICATESWIRE135 INHARNESS“AG”

325-PK-14

WIREGAUGE

WIRECOLOR

CIRCUITNUMBER

IDENTIFICATION

WIRENUMBERIDENTIFICATIONCODES

CURRENT STANDARD

PREVIOUSSTANDARD

E LE CT RI CA L SC HE MA TI C EX AM PL E H YD RA UL IC S CH EM AT IC E XA MP LE

325-PK

WIRECOLORCIRCUITNUMBER

IDENTIFICATION

B

WIRE

WIRE

(EXAMPLEVALVE)

CURRENT STANDARD

TRANSDUCER(FLUID)

M

ELECTRICMOTORTRANSDUCER(GAS/ AIR)

G

GENERATOR

PRESSURE SWITCH ELECTRICAL WIREPRESSURESWITCH(ADJUSTABLE)

TEMPERATURESWITCH

PRESSURE

SWITCH

TEMPERATURE

SWITCH

LEVEL

SWITCH

FLOW

SWITCH

ELECTRICALSYMBOLS(ELECTRICAL)

 A

CIRCUITNUMBERIDENTIFICATION

WIRECOLOR

WIREGAUGE

T

   U   E   N   R   2   4   7   4  -   0

   1

   3   0   P  a  g  e ,

   (   D   i  m  e  n  s   i  o  n  s  :   3   9   i  n  c   h  e  s  x   2   8   i  n  c   h  e  s   )

4 6

5

4 6

512

30 13 31

12

30 13 31

11

20

29

3

2

24

2717192518

11

20

29

3

2

24

2717192518

2621

1

23

10

28

22

2621

1

23

10

28

22

815

16

14

SOS  AA

DD

EE

FF

7

9BB

CC

815

16

14

SOS  AA

DD

EE

FF

7

9BB

CC

MAIN CONTROL VALVEPUMP GP - MAIN HYDRAULIC

MACHINE COMPONENT LOCATIONSOPERATOR CONTROL (CAB REMOVED)

Tap

Number Description

Schematic

Location

 AA Pilot Pump Delivery Pressure

BB Driven Pump De l ive ry Pressure

CC Ca se Dr ai n P r es s ur e

DD Dr iv e P um p Del i ve r y Pr e ss u re

EE Driven Pump Powersh ift Pressure

FF Drive Pump Powersh ift Pressure

S O S Hy dr a ul i c Oi l S am p li ng P o rt

TapLocation

Pressureand Sampling

DescriptionPart

Number 

Machine

Location

Schematic

Location

 AccumulatorGp- Hydraulic(Charged) 164-6981 1

Control Gp - Joystick (LH) 297-0533 2

Control Gp - Joystick (RH) 297-0532 3

Cylinder Gp - Boom Note A 4

Cylinder Gp - Bucket Note A 5

Cylinder Gp - Stick Note A 6

F il te ra nd Va lv eG p- P il ot ( Hy dr au li cO il ) 1 58 -8 98 7 7

Filter Gp -Oil (Hydraulic Return) 188-4140 8

F il te rG p- Oi l( Hy dr au li c, C as eD ra in ) 2 89 -8 19 4 9

M an if ol dG p- C on tr ol (P il ot O il Su pp ly ) 2 15 -5 03 7 1 0

Motor Gp - Swing 334-9968 11

Motor Gp - Travel (Left) 209-5992 12

Motor Gp - Travel (Right) 209-5992 13

Pump Gp - Main Hydraulic 376-8862 14

15

16

17

18

19

Se nso rG p- Pr es sure Dr iv ePu mp 33 6- 9312

20

S en so rG p- Pr es su re D ri ve nP um p 3 36 -9 31 2

21

22

Sw it ch As - Pr es sur e( Imp lem ent ) 3 09- 5769

23

Sw it ch As - Pr es sur e( Lef tT rav el ) 3 09- 5769

24

S wi tc hA s- Pr es su re (R ig ht T ra ve l) 3 09 -5 76 9

25

Swivel Gp 234-4440

26

27

Valve Gp -Check (Return) 369-0420

28

V a lv e G p - Lo ad Co nt r ol ( B oo m Dri f t Red u ct i on ) 2 5 5- 5 68 3

29

V a lv e G p - Lo ad Co nt r ol ( S ti c k Dr i ft Re du ct i on ) 2 5 5- 5 68 0

30

Valve Gp - Main Control 259-7464

31

Valve Gp - Pilot (Travel) 310-0414

Va lveGp-PressureReducing (Boom,SwingPrio r i ty) 310-0210

Valve Gp - Shuttle 185-0462

Valve Gp -Swing Cushion 322-8716

V al ve G p - Tr av el C ou nt er ba la nc e (L ef t) 3 22 -8 71 4

V al ve G p - Tr av el C ou nt er ba la nc e (R ig ht ) 3 22 -8 71 4

ComponentLocation

Note A: Refer to parts manualfor specifi c cylinder information.

Valve Gp - Shuttle 164-6979

 AA A-4

BB B-3

CC A-3

DD A-3

EE B-2

FF A-2

SOS A-4

1 B-5

2 C-8

3 C-7

4 F-7

5 F-8

6 F-8

7 A-4

8 A-6

9 A-4

10 B-5

11 F-6

12 F-5

13 F-4

14 B-2

15

16

17

18

19

20

 A-3

21

B-3

22

23

 A-8

24

E-8

25

E-7

26

E-4

27

28

 A-6

29

D-1

30

D-5

31

D-3

F-7

B-4

B-7

E-6

E-5

E-4

B-4FRONT VIEW

REAR VIEW

HYD.TANK

8/20/2019 Ciurcuito Hidraulico de Excavadora 320D

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   U   E   N   R   2   4   7   4  -   0

   1

   3   0   P  a  g  e ,

   (   D   i  m  e  n  s   i  o  n  s  :   3   9   i  n  c   h  e  s  x   2   8   i  n  c   h  e  s   )

Components are shown installed on a fully operable machine with the key and engine off, transmission shifter in neutraland with parking brake set.

SCHEMATICPART NUMBER: 369-8400, CHANGE: 00, VERSION: HE

MEDIANUMBER: UENR2474-01

THISSCHEMATICISFORTHE320DAND 323DEXCAVATORAND323DMHPU HYDRAULICSYSTEM

12345678

 A

B

C

D

E

F

12345678

 A

B

C

D

E

F

LINEPATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)YY

(52)VALVEGP- CONTROL

138-1234

Callout Number (Machine Location from

Component LocationsTable)

ComponentName

Part Number 

HYDRAULICCIRCUIT COLORDESCRIPTIONS

PILOT PUMPOUTPUT

DRIVENPUMPOUTPUTSTEERING CIRCUIT

SUPPLYLINE

STICKCYLINDERCONTROL CIRCUIT

LEFT TRAVEL MOTORCONTROL CIRCUIT

SWING MOTORCONTROL CIRCUIT

DRAIN/ RETURNLINE

SWING BRAKECONTROL CIRCUIT

DRIVEPUMPOUTPUT

TRAVEL SPEEDCONTROL

BUCKET CYLINDERCONTROL CIRCUIT

RIGHT TRAVEL MOTORCONTROL CIRCUIT

BOOM CYLINDERCONTROL CIRCUIT

255-5680

259-7464

209-5992   209-5992

322-8714   322-8714

234-4440

188-4140  158-8987

376-8862

289-8194

TP

TT

TRAVEL(L) TRAVEL(R)

(FWD)   (BKWD)   (FWD)(BKWD)

T1T5T2 T4T6T3

(OUT) (IN) (R)   (L)   (CLOSE)(OPEN)   (DOWN) (UP)

JLP

JLT

JRP

JRT

BOOMBUCKETSTICK   SWING

JL1 JL3 JL2 JL4 JR4JR2 JR3JR1

1

1

2

23

3

4

4

5

5  6

6

310-0210

310-0414

297-0533

297-0532

255-5683

TRAVEL MOTOR (LEFT)   TRAVEL MOTOR (RIGHT)

Pp3

B A B A

 AG   AGBG   BG

T2   T2

T1 T1

Pp3

(FWD) (FWD)(BKWD)   (BKWD)

T

OUT

PG   PC

IN

PsM2 A2

 A1

G1

S1

DrM

Ps2

Pn2

G4

Ps1

Pm

M1

M2

S3

G2

DrG3

Pn1

PsM1

 A3

Pi

DR6T-OUT1DR5Pi2DR4DR3

P2   P-IN   PSA2 DR1   PSA1   DR2T-OUT2Pi1

PAC

P1

215-5037

164-6981

185-0462

 A1 A2 A3   A4 A5   A6   A7   A8

B8B7B6B5B4B3B2B1

Dr

 A1B1   B 2 A 2

P1   P2

164-6979

SP3 BP3

SP1 ST   BP1 BT

BP2SP2

T

369-8420

 A

B

C   E

D

F

G

bR2

aR2   AR2BR2

322-8716

334-9968

 A   B

MU

DR

PG

SWING MOTOR

(L)(R)

 A1   B1DR

 AG   BG

U

RR FR

bL3

aR3

bR3

bL4

aL2bL2

bR1aR1aL1bL1

bR1

bR3

 AR3 AL3 AR4BR3 BR4BL3

BL1 AL1 AR1 BR1

PL

PR

bR5

BL2

BL3

BL1

aL1

aL4

aL2

SPi

BR4BR5

BPi

aR3 AL1 AL2

 AR3

bL2

bL1

bL4

BR1

BR3

 AL3

aL3 aR1

PL PR

bR4

aR4

HR

HL bL3

bR5

 AR4

Pi2

HL

HR

 AL4

 AR5

 AL4

B R5 A R5

Pi1

SPi

R3

 AR1

R1BR4R2BL3   (IN)

(OUT)   (FWD)   (FWD)   (OUT)

(DOWN) (IN)

      S      T      I      C      K      (      2      )

      B      O      O      M      (      1      )

      B      U      C      K      E      T

      A      T      C      H

      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)(OPEN)

(CLOSE)(BACK) (BACK)(L)

(R)

(UP)

aL3

Pi2

R3

 AL2BL2

bR4

Pi1

aR4

BPi

aL4

FINESWING

309-5769

 AA SOS

CC

BB

DD

EE

FF

309-5769   309-5769

336-9312

336-9312

(4) BOOM CYLINDER(6) STICK CYLINDER(5) BUCKET CYLINDER

(29) VALVE GP

SWING CUSHION

(11) MOTORGP

SWING

(12) MOTORGP

TRAVEL(LEFT)

(13) MOTORGP

TRAVEL(RIGHT)

(30) VALVEGP

TRAVELCOU NTERBALANCE

(LEFT)

(31) VALVEGP

TRAVELCO UNTERBALANCE

(RIGHT)

(20) SWIVELGP

(1) ACCUMULATOR GP

HYDRAULIC

(CHARGED)

(10) MANIFOLDGP

CONTROL

(PILOTOILSUPPLY)

(8)FILTERGP

OIL(HYDRAULICRETURN)

(7) FILTER AND VALVEGP

PILOT

(HYDRAULICOIL)

(14) PUMPGP

MAINHYDRAULIC

(9) FILTERGP - OIL

(HYDRAULIC, CASE DRAIN)

(27) VALVEGP

SHUTTLE

(25) VALVEGP

PILOT

(TRAVEL)

(2) CONTROLGP

JOYSTICK(LH)

(3) CONTROLGP

JOYSTICK(RH)

(22) VALVE GP

LOADCONTROL

(BOOM DRIFTR EDUCTION)

(24) VALVE GP

MAINCONTROL

(21) VALVEGP

CHECK

(17) SWITCHAS

PRESSURE

(IMPLEMENT)

(23) VALVEGP

LOADCONTROL

(STICKDRIFTREDUCTION)

(15) SENSORGP

PRESSURE

DRIVEPUMP

(16) SENSORGP

PRESSURE

DRIVENPUMP

(18) SWITCHAS

PRESSURE

(LEFTTRAVEL)

(19) SWITCHAS

PRESSURE

(RIGHTTRAVEL)

(28) VALVE GP

SHUTTLE

(1) ACCUMULATOR GP

HYDRAULIC

(CHARGED)

(26) VALVEG P

PRESSUREREDUCING

(BOOM, SWING PRIORITY)