374f excabadora hidraulico

INTERACTIVE SCHEMATIC Bookmarks

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Features Cover Page Tables Component Connector 

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EC-C2 EC-C3

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E-C60 E-C61

VIEW ALL CALLOUTS EC-C1

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ELECTRICAL SYMBOLS

HOTKEYS (Keyboard Shortcuts)

BASIC HYDRAULIC COMPONENTSYMBOLS

T

FUNCTION

KEYS

Zoom In

“CTRL” / “+”

Zoom Out

“CTRL” / “-”

Fit to Page

“CTRL” / “0” (zero)

Hand Tool

“SPACEBAR” (hold down)

Find

“CTRL” / “F”

Pressure Switch

Temperature Switch

Level Switch

Flow Switch

Circuit Breaker 

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Pump or Motor 

Variability

Fluid Conditioner 

Spring (Adjustable)

SCHEMATIC SYMBOLS AND DEFINITIONS  VALVES

INTERNAL PASSAGEWAYS

ENVELOPES

Two Position

One Position

Three Position

PORTS

Two-way

Three-Way

FLOW IN ONE DIRECTION

FLOW ALLOWED IN EITHER DIRECTION

Infinite Positioning

Two Position

PARALLEL FLOW

PUMPS CROSS FLOW

Unidirectional

Three Position

BASIC HYDRAULIC COMPONENT SYMBOLS

FIXED DISPLACEMENT DISPLACEMENT

Pump or Motor 

Variability

Fluid Conditioner 

Spring (Adjustable)

Spring

Pressure Compensation

Control Valves

Line Restriction (Variable)

Restriction

Line Restriction (Fixed)

Line Restriction Variable and Pressure Compensated

2-Section Pump

Attachment

Pump: Variable and Pressure Compensated

Bidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

CYLINDERS

Four-Way

Unidirectional

Bidirectional

CONTROL  A B

 A B

P T

P T

Single Acting

FIXED DISPLACEMENT DISPLACEMENT

Shifted Position

Normal Position

MOTORS

Double Acting

Infinite Position

CHECK

 ACCUMULATORS Basic Symbol

Spring Loaded

Shuttle

Unidirectional

Bidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

Pilot Controlled

Spring Loaded Gas Charged

Unidirectional

Bidirectional MAIN  AUX.

PILOT CONTROL

ROTATING SHAFTS

RELEASED PRESSURE

Unidirectional

External Return

Internal Return

Bidirectional

REMOTE SUPPLY PRESSURE

Simplified

Complete

Internal Supply Pressure

Hydraulic Pneumatic Energy Triangles

COMBINATION CONTROLS LINES

Solenoid

Solenoid or Manual

Solenoid and Pilot

Solenoid and Pilot or Manual

Servo

Thermal

Detent

Crossing

MANUAL CONTROL

Push-pull Lever

Manual Shutoff 

General Manual

MEASUREMENT

Joining

Pressure

Temperature

Flow

FLUID STORAGE RESERVOIRS

Push Button

Pedal

Spring

Vent Vented ed

Pres Pressu suri rize zed d

Retu Return rn Abov Above e Flui Fluid d Leve Levell

Retu Return rn Belo Below w Flui Fluid d Leve Levell

ELECTRICAL SYMBOLS

HYDRAULIC SYMBOLS - ELECTRICAL

M

G

T

Transducer  (Fluid)

Transducer  (Gas / Air)

Generator

Electric Motor 

Pressure Switch

Pressure Switch (Adjustable)

Temperature Switch

Electrical Wire

Pressure Switch

Temperature Switch

BASIC ELECTRICAL COMPONENT SYMBOLS Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.

Level Switch

Flow Switch

Circuit Breaker 

HARNESS AND WIRE SYMBOLS Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).

Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component.

1

Part Number: for  Number: for  Connector Plug

2

Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine. Plug

Ground (Case): This indicates that the component component does not have a wire connected to ground. It is grounded by being fastened to the machine. Reed Switch: A Switch:  A switch whose contacts are controlled controlled by a magnet. A magnet closes the contacts of 

L-C12 3E-5179

 AG-C4 111-7898

Receptacle Pin or Socket Number 

Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...) Harness Connector Serialization Code: The Code:  The "C" stands for "Connector" and the number indicates which connector connector in the

UENR2488-02 January 2014

374F Excavator  Hydraulic System NFJ1-UP MFL1-UP DNM1-UP AT21-UP AP41-up

© 2014 Caterpillar, All Rights Reserved

Printed in U.S.A.

COMPONENT TABLE Component Locations Part Number 

Machine Location

Schematic Location

335-0546

1

D-2

Filter Gp - Oil (Hydraulic Oil)

185-0336

2

A-6

Filter Gp - Oil (Hydraulic Return)

188-4145

3

A-8

Filter Gp - Oil (Tank)

6E-5534

4

A-7

Manifold Gp - Solenoid

447-1041

5

C-2

Motor Gp - Fan (LH)

364-0983

6

C-7

Motor Gp - Fan (RH)

364-0983

7

B-7

Motor Gp - Piston (Swing Left)

295-9414

8

F-2

Motor Gp - Piston (Swing Right)

295-9416

9

F-3

Motor Gp - Piston (Travel) (LH)

228-3238

10

F-8

Motor Gp - Piston (Travel) (RH)

228-3238

11

F-7

Pump Gp - Fan

448-9705

12

B-4

Pump Gp - Main Hydraulic

369-9655

13

A-1

Pump Gp - Pilot Pressure

369-9658

14

B-3

Sensor Gp - Postion (Drive Pump)

369-9618

15

A-3

Sensor Gp - Postion (Idler Pump)

369-9618

16

A-1

Sensor Gp - Pressure (Boom Extend)

344-7392

17

C-4

Sensor Gp - Pressure (Boom Extend)

344-7392

18

C-6

Sensor Gp - Pr Pressure (B (Bucket Ex Extend)

344-7392

19

D-4

Sensor Gp - Pressure (Bucket Retract)

344-7392

20

D-6

Sensor Gp - Pressure (Drive Pump)

344-7392

21

D-4

Sensor Gp - Pressure (Idler Pump)

344-7392

22

E-4

Sensor Gp - Pressure (Stick Extend)

344-7392

23

F-4

Sensor Gp - Pressure (Stick Retract)

344-7392

24

F-6

Sensor Gp - Pressure (Swing)

344-7392

25

E-3

Sensor Gp - Pressure (Travel LH)

344-7390

26

C-8

Sensor Gp - Pressure (Travel RH)

344-7390

27

C-7

Swivel Gp

295-9595

28

E-7

Valve Gp - Check (Return Valve)

369-8475

29

E-6

Valve Gp - Check (Tank)

352-7222

30

A-7

Valve Gp - Main Control

381-1859

31

B-6

Valve Gp - Manifold (Pilot Pressure)

352-7080

32

D-3

Valve Gp - Pilot (Travel, Shuttle)

369-8502

33

D-8

Valve Gp - Reversing (Fan)

360-4604

34

B-7

Valve Gp - Swing Cushion

315-4394

35

E-2

Valve Gp - Travel Counterbalance (LH)

143-8067

36

E-8

Valve Gp - Travel Counterbalance (RH)

143-8067

37

E-7

Description

 

 Accumulator Gp - Hydraulic Hydraulic (Pilot (Pilot Pressure) Pressure)

Note: Check Part Number In The Part Manual For Your Specific Machine.

TAP TABLE

Tap Locations Pressure, Sampling, and Sensor  Tap Number 

Description

Schematic Location

 AA

Drive Pump Pressure

B-3

BB

Idler Pump Pressure

B-1

B1

Pump 1 NFC PRV Pressure

C-2

B2

Pump 2 NFC PRV Pressure

C-2

B3

Power Shift Pressure

C-2

PP

Pilot Pressure Output

 A-6

8

7

6

5

4 STICKSIDE WARM-UP SOL

(10)MOTORGP PISTON(TRAVEL)(LH) 228-3238

B

L

BR

PP3

T1

T1

T2

T2

L6a

STICK EXTEND PRV CT

(24)SENSORGP PRESSURE (STICK RETRACT) 344-7392 L

BR

STICK EXTEND PRV PC

STICK RETRACT PRV CT

PM2-CV3

R6

STICK RETRACT PRV PC

(ROD)

PM2-SW

STICK  ANTI -DRIFT VALVE

DB

(23)SENSORGP PRESSURE (STICK EXTEND) PG 344-7392 (9)MOTORGP PISTON(SWINGRIGHT) 295-9416

STICK

 A

BG

1

PG2

PG1

PR PD

BG

PA

Pi3b

AG

PB

(22)SENSORGP PRESSURE (STICK PUMP) 344-7392 L5

PA

M  A

PB

M

TS

B

 A1

B1

(35)VALVE GP SWING CUSHION 315-4394

(LEFT)

BYPASSPS

E

TRAVEL(R)

pR4f 

TRP2

R5

SWING LEFT PRV

B(UPPER)

 A

B

E

D (FWD) L3

TRP1

C

(BKWD )

R3

(BKWD)

(FWD )

L4

R4

(37)VALVE GP TRAVELCOUNTERB ALANCE (RH) 143-8067

H  A TR

T2

DRAIN FILTER

PUMP2 BYPASS CUTPRV

COMBINER

Pi3a

PM1-BYP

PM1-FAN

J W

STICK CYLINDER

BOO M CYLIND ER

PM2-CV1

PM1-BYP

pL3b

TLP1 L3

Dr3

R3

D

FLOWCOMBINER PRV

STRAIGHTTRAVEL PRV

SWING RIGHT PRV

pR3f 

TLP2

(21)SENSORGP PRESSURE(BOOMPUMP) 344-7392 (32)VALVE GP PMDr-BYP MANIFOLD(PILOTPRESSURE) 352-7080        3        i

PM2-SW

(ROD)

L2

R2

R6

L6a

PM2-TRL

L1

L2

BUCKET RETRACT PRV CT

R1

BUCKET RETRACT PRV PC

BUCKET EXTEND PRV PC

PM2-CV2        2        i        1        i        P        P

       5        4        3        2        1        A        A        A        A        A        S        S        S        S        S        P        P        P        P        P

R5

(RIGHT)

PM2-CV2 LINE PATTERNS

R2 (HEAD)

TRL-T

TP TT

TRAVEL(L)

(20)SENSORGP PRESSURE (BUCKETRETRACT) 344-7392

TRAVEL(R)

D

PMDr-CV2

Dr2 Pi2

BUCKET EXTEND PRV CT

(1)ACCUMULATORGP HYDRAULIC(PILOTPRESSURE) 335-0546

HYD. LOCK SOL

P-BT

BYPASS PBT

TRAVEL(L)

PM2-TRL

       P

PUMP1 BYPASS CUTPRV

TS

(33)VALVE GP PILOT(TRAVEL,SHUTTLE) 369-8502

B

PM2-CV3

L BHPi

BU CKET CYLIND ER

(L)

(R)  A

K

T1

B TL

2SPEED TRAVEL CONTROL

(25)SENSORGP PRESSURE (SWING) 344-7392

SWING

pL4b

(29)VALVE GP CHECK (RETURN VALVE) 369-8475 X

(28)SWIVELGP 295-9595

SHPi

STRTRAVEL

L4

 A(UPPER)

B(LOWER)

L5

P-S

R4

 A(LOWER)

(36)VALVE GP TRAVELCOUNTE RBALANCE (LH) 143-8067

F

(8)MOTORGP PISTON(SWINGLEFT) 295-9414

DB

SWING BRAKE SOL

B

 A

 AG

2

PMDr-CV3 (HEAD)

F

PP3

Pi4 Dr4

Pi5

(11)MOTORGP PISTON(TRAVEL)(RH) 228-3238

3

BUCKET

PressureLine

PAC

(19)SENSORGP PRESSURE (BUCKET EXTEND) 344-7392

       N        I           P

       T        U        O           T

       T        U        O           R        D

PM-T

PMDr-T

Pilot / LoadSensingPressure

       5        4        3        2        1        R        R        R        R        R        D        D        D        D        D

Drain/ ReturnLines

PMDr-BYP

ComponentGroup CALLOUTS

PMDr-CV3

Taps (Pressure,Sampling,Sensor-byletter)

YY

PMDr-CV1

Callout Number 

PMDr-CV2

(MachineLocationfrom Component LocationsTable)

(52)VALVE GP-CONTROL 138-1234 PartNumber 

Component Name

HYDRAULICCIRCUIT COLORDESCRIPTIONS

(FWD) T2

C

(BKWD) T5

TLP1

(BKWD)

T1

(FWD)

T3

TLP2

T6

TRP2

L1

BOOM RETRACT PRV CT

BOOM RETRACT PRV PC

BOOM EXTEND PRV PC

R1

BOOM EXTEND PRV CT

(18)SENSORGP PRESSURE(BOOMRETRACT) 344-7392

(17)SENSORGP PRESSURE (BOOMEXTEND) 344-7392

BOOM

(6)MOTORGP FAN(LH) 364-0983  A  A1

P

B

T

T

MAINRELIEF PRESS.CHANGE SOL

(HEAD)

BOOM  ANTI -DRIFT VALVE

SHPi

PUMP1NFC PRV

TRAVEL SPEED  CHANGE SOL

B5

BHPi

(27)SENSORGP PRESSURE (TRAVELR H) 344-7390

(1)ACCUMULATORGP HYDRAULIC(DRAIN) 335-0538

(26)SENSORGP PRESSURE (TRAVEL LH) 344-7390

(ROD)

T4 TRP1

P

 A5 B4

2SPEED TRAVEL CONTROL

PILOT PUMP OUTPUT BOOMPUMPOUTPUT COOLING FANPUMP ANDCIRCUIT SUPPLY LINE STICKCONTROLCIRCUIT LEFTTRAVELMOTORCIRCUIT SWINGMOTORCIRCUIT DRAIN/ RETURNLINE SWINGBRAKECIRCUIT STICKPUMPOUTPUT TRAVELSPEEDCONTROLCIRCUIT BUCKETCONTROLCIRCUIT RIGHTTRAVELMOTORCIRCUIT BOOMCONTROLCIRCUIT POWERSHIFTCIRCUIT

5SOL-T

PS PRESS EPRV

PUMP2NFC PRV

 A4

B3

B3

 A3

 A2

B2

B1

(5)MANIFOLDGP SOLENOID 447-1041

A1

C

B1

B2

L2

L3 DR

B1

H3(A) PMDr-CV1

Pi 1

 A  A2

B

BOOMSIDE WARM-UP SOL

(31)VALVE GP MAINCONTROL 381-1859

C R (A)

L 5(A)

L5(B)

CR(B)

H 3(B)

PM2-CV1

Dr1

B

L3

DR

P-BT

X

L2

Dr B

Pi

B2

(7)MOTORGP FAN(RH) 364-0983

PM1-FAN

P-S

 AA

(34)VALVE GP REVERSING (FAN) 360-4604 (12)PUMPGP FAN 448-9705

DRAIN FILTER

(4)FILTERGP OIL(TANK) 6E-5534

P.P.O

(14)PUMPGP PILOTPRESSURE 369-9658

BB MA

 A

PA

PB

B

MB

(13)PUMPGP MAINHYDRAULIC 369-9655

B

MB1

P.P.I

PP PM-T TRL-T

 A

5SOL-T

(2)FILTERGP OIL(HYDRAULICOIL) 185-0336

PMDr-T

G

S

(30)VALVE GP CHECK (TANK) 352-7222

L1

L

(16)SENSORGP POSTION(STICKPUMP) 369-9618

G M1A

T1T2

T2

S

M1B

 A

(15)SENSORGP POSTION(BOOMPUMP) 369-9618 THIS SCHEMATICIS FORTHE 374F EXCAVATORHYDRAULIC SYSTEM

MEDIA NUMBER: UENR2488-02 SCHEMATICPART NUMBER: 349-1966, CHANGE: 07, VERSION: HE

(3)FILTERGP OIL(HYDRAULICRETURN) 188-4145

Componentsareshowninstalledona fullyoperablemachinewiththe keyandengineoffwithparkingbrakeset. RefertotheappropriateServiceManualforTroubleshooting,Specifications andSystemsOperations.

8

7

6

5

4

3

2

1

MACHINE VIEW VIEW ALL CALLOUTS

7

3

6

34

10 30 36

15

MACHINE VIEW VIEW ALL CALLOUTS

3

7 6

34

10 30 36

15 37 11

MAIN PUMPS RIGHT SIDE VIEW VIEW ALL CALLOUTS

2

PP

4

14

12

B1

B2

B3

5

13

16

BB

AA

MAIN PUMPS RIGHT SIDE VIEW VIEW ALL CALLOUTS

2

PP

4

14

12

B1

B2

B3

5

13

16

BB

AA

MACHINE TOP VIEW VIEW ALL CALLOUTS

25

8

35

26

33

27

MACHINE TOP VIEW VIEW ALL CALLOUTS

25

8

35

26

33

27

9

28

MAIN CONTROL VALVE REAR VIEW VIEW ALL CALLOUTS

20

23

31

22

24

MAIN CONTROL VALVE REAR VIEW VIEW ALL CALLOUTS

20

18

23

32

31

29

21

22

1

24

19

17