Esquema Hidraulico Cat 420 e

8

7

6

5

4

2

1

BOOSTED BRAKES (REF)

14 12

11B

3

15

13

TO REARAXLE

16

LEFTWHEELBRAKE

33

11A

F

F LEFT BRAKE PEDAL

30

30H BACKHOE VALVE

TO REARAXLE RIGHT BRAKE PEDAL

RIGHTWHEELBRAKE

BS

BT

18

E

E

STAB RH

32A

32B

BOOM

STICK

SWING

30G

BUCKET

32C

E-STICK

AUX.

30J

32D

STAB LH

32E

32B

30K

32F

D

D

20 STABILIZER JOYSTICK

21

LEFT JOYSTICK

RIGHT JOYSTICK

19

27A

   2    f   o    1    L    O    V    1    3    2    0 ,    R  e   g   a    P    N    0    E    3    U

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

T3

17C17A

34

34

C

C

27B DEL

LIFT

8A

9A

T2 36

1

27C TILT

22 HYDRAULIC CIRCUIT COLOR DESCRIPTIONS IMPLEMENTANDSTEERING PUMPCIRCUIT PILOTOIL CIRCUIT BOOSTEDBRAKE OILCIRCUIT

SOS

B

5

T1

27D

DRAIN/ RETURNLINE STEERING CYLINDERCIRCUIT LIFTCYLINDER CIRCUIT TILTCYLINDERCIRCUIT  AUXILIARYCIRCUIT(LOADER VALVE)

23

STABILIZERCYLINDERCIRCUIT BOOM CYLINDERCIRCUIT STICKCYLINDER CIRCUIT

AUX.

10

LOADER VALVE

SWING CYLINDERCIRCUIT BUCKETCYLINDERCIRCUIT E-STICKCYLINDERCIRCUIT  AUXILIARYCIRCUIT(BACKHOEVALVE)

4

6 27

B

LOADSENSE CIRCUIT SUPPLYLINE

PUMP

27E

LINEPATTERNS Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines

3

Component Group  Attachment

A

2

 Air Line

HMU

FRONT STEER CYL.

CALLOUTS YY

Taps (Pressure,Sampling,Sensor) byletter 

52

Components bynumber 

7A

TANK THIS SCHEMATIC IS FOR THE 420E AND 430E BACKHOE LOADER (SINGLE TILT) HYDRAULIC SYSTEM VOLUME 1 of 2: SINGLE TILT PART NUMBER: 297-5426, CHANGE: 01, VERSION: S Components are shown installed on a fully operable machine. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

A

8

7

6

5

4

3

2

1

BOOSTED BRAKES (REF)

14 11B

12

TO REARAXLE

15

33

13

LEFTWHEELBRAKE

16 11A

F

F

LEFTBRAKE PEDAL

TO REARAXLE

30

RIGHTWHEELBRAKE

30H

RIGHTBRAKE PEDAL

BACKHOE VALVE

BS

BT

18

E

E

STAB RH

32A

32B

BOOM

STICK

SWING

30G

BUCKET

32C

E-STICK

32D

AUX.

30J

STAB LH

32E

32B

30K

32F

D

D

20 STABILIZER JOYSTICK

21

LEFT JOYSTICK

RIGHT JOYSTICK

19

27A

   2    f   o    2    L    O    V    1    3    2    0 ,    R  e   g   a    P    N    0    E    3    U

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

T3

34

34

17C 17B 17A C

C

DEL

LIFT

8B

28B

LOADER JOYSTICK

9B

35 36

T2

RTD

FLOAT

1

TILT

28C

22

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS IMPLEMENTANDSTEERING PUMPCIRCUIT

B

10

PILOTOIL CIRCUIT BOOSTEDBRAKE OILCIRCUIT LOADSENSE CIRCUIT SUPPLYLINE

SOS

5

T1

23

 AUXILIARYCIRCUIT(LOADERVALVE) STABILIZERCYLINDERCIRCUIT BOOM CYLINDERCIRCUIT

AUX.

STICKCYLINDERCIRCUIT SWING CYLINDERCIRCUIT BUCKETCYLINDERCIRCUIT

28B LOADER VALVE

E-STICKCYLINDERCIRCUIT  AUXILIARYCIRCUIT(BACKHOEVALVE)

4 6

28

B

DRAIN/ RETURNLINE STEERING CYLINDERCIRCUIT LIFTCYLINDERCIRCUIT TILTCYLINDERCIRCUIT

27E

PUMP

LINE PATTERNS Pressure Line Pilot / Load Sensing Pressure

26

25

Drain / Return Lines Component Group

3

 Attachment

A

 Air Line

2

CALLOUTS

HMU FRONT STEER CYL.

7A

YY

Taps (Pressure,Sampling,Sensor)by letter 

52

Components by number 

TANK THIS SCHEMATIC IS FOR THE 420E AND 430E BACKHOE LOADER (PARALLEL LIFT) HYDRAULIC SYSTEM VOLUME 2 of 2: PARALLEL LIFT PART NUMBER: 297-5426, CHANGE: 01, VERSION: S Components are shown installed on a fully operable machine. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

A