Hyundai 130w-3 Hyd

8/9/2019 Hyundai 130w-3 Hyd

1/28

GROUP 1 HYDRAULIC CIRCUIT

TB

XBa2

dr1~dr14

Aa1

Ba1

XBb2

XAs

As

Bd

XAd

Ad

XBd

Ak1

Pa1

Ck1

XAks fl frdr8

XAah

XBa1

OP

dr10

Bs

XBs

Pz P1 PxPi

RP2

XAa2

XBa2

XAks

XAk

Bk1

XBk

At

Bt

XAt

XBt

Ao

Ck2

XBt

XAa1

XAas

T2~T4

Bo

Py

dr9

DOZER SWING ARM BOOM BUCKET

XBd XAd XBa1 XAa1 XBb1 XBk XAk

XBs XAs

ACCELERATOR

XAa1

XAa2

XAasSh

Pg

Pi

dr2

XAt Pz

XBb1

Sh

A B

Pgdr7

Ab1

XAah

P

T

P

dr6 dr5 dr3 dr4

T1

Pa1

P2 P1

fr(pi2)

dr1

A1 A2

fl(pi1)

320k(350k)

380k

380k

380k

220k

dr12 dr13

T4P

G1 G2 G3 G4 G5 G6

TP

P1 T3

TM2

TM1

P2 P1

T2

dr14 T1

3545 46 33 3422

12

15

1314

8

1744

37

20

7

37

2932

21 5

37

31

30

2827

26

2423

25

E

6

3

42

43

38

47

1940

16

918

41

10

11

1

3939

2

Mu

XAo

XBo

T

B A

360k

4

3-1


2/28

3 -5

The pilot circuit consists of suction circuit, delivery circuit and return circuit.

The pilot pump is provided with relief valve, receives the oil from the hydraulic tank through the

suction filter.

The discharged oil from the pilot pump flows to the remote control valve through line filter, EPPR

valve, solenoid valve assemblies, swing parking brake, main control valve and safety lock solenoid

valve through line filter.

GROUP 3 PILOT CIRCUIT

Control valve

Acceleratorpedal

Remote control valve

(LH lever)

RCV

lever(Dozer)

Remote control valve

(RH lever)

Safety locksolenoid valve Swing parking brake

Main pump

Line filter

Relief valve40kg/cm2

Travel speed shift port oftransmission

Pilot pumpSuction filter

Arm half flow solenoid valve

Power boost solenoid valve


3/28

3 -6

The pilot pump receives oil from the hydraulic tank. The discharged oil from the pilot pump flows to

the safety solenoid valve through the line filter. The oil is filtered by the line filter. The pilot relief

valve is provided in the pilot pump for limiting the pilot circuit pressure.

The oil filtered by line filter flows into the remote control valve through safety solenoid valve.

The return oil from remote control valve is returned to hydraulic tank through the spin filter.

1. SUCTION, DELIVERY AND RETURN CIRCUIT

PILOT PUMP

RELIEF VALVE

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVETRANSMISSONVALVE

FRONT AXLE REAR AXLE

TRANSMISSON

TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL

ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION

T2~T4

dr1~dr14

Pg

Pi

dr2

BOOM BUCKETACCELERATOR DOZER SWING ARM

PEDAL RCV LEVER(DOZER)

RCV LEVER(LH) RCV LEVER(RH)

GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTER

STRAINER

dr6 dr5 dr3 dr4

T1


4/28

3 -7

When the lever of the safety solenoid valve is moved downward, oil flows into the remote control

valve through solenoid valve and line filter.

When the lever of the safety solenoid valve is moved upward, oil does not flow into the remote

control valve because of block by the spool.

PILOT PUMP

RELIEF VALVE

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVETRANSMISSONVALVE


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION




GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTER

STRAINER

T2~T4

dr1~dr14

Pg

Pi

dr2

dr6 dr5 dr3 dr4

T1

LEVERDOWN

LEVER UP

2. SAFETY SOLENOID VALVE(SAFETY LEVER)


5/28

3 -8

When the power max switch on the left control lever is pushed ON, the power max solenoid valve is

actuated, the discharged oil from the pilot pump flows into Pz port of the main relief valve in main

control valve ; Then the setting pressure of the main control valve is raised from 320 kgf/cm2 to

350kgf/cm2 for increasing the digging power. And even when pressed continuously, it is canceled

after 8 seconds.

3. MAIN RELIEF PRESSURE CHANGE CIRCUIT

PILOT PUMP

RELIEF VALVE

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION




GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTERSTRAINER

Pz

POWER BOOSTSOLENOID VALVE

T2~T4

dr1~dr14

PgPi

dr2

dr6 dr5 dr3 dr4

T1

PzMAIN RELIEFVALVE


6/28

3 - 9

When the swing control lever is operated, the pilot oil flows to Sh port of shuttle valve, this pressure

moves spool so, discharged oil from pilot pump flows to Pg port.

This pressure is applied to swing motor disc cylinder, thus the brake is released.

When the swing control lever is set in neutral position, oil in the swing motor disc cylinder is drained,

thus the brake is applied.

4. SWING PARKING BRAKE RELEASE

PILOT PUMP

RELIEF VALVE

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION




GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTERSTRAINER

Sh T2~T4

dr1~dr14

PgPi

dr2

dr6 dr5 dr3 dr4

T1

A BMu

dr7Pg

Sh

SWING MOTOR


7/28

3-10

When the arm half flow switch is turned ON, the arm half flow solenoid valve is switched to ON and

Arm2 pilot port XAa2 is connected with drain line : So the spool of ARM2 is not actuated. As a result,

the arm in operation is only the ARM1 section. This function is useful for fine control of the arm in

case of finishing work.

5. ARM HALF FLOW SYSTEM

XAa1

PILOT PUMP

RELIEF VALVE

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION




GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTER

STRAINER

XAa1

XAa2

ARM HALFSOLENOIDVALVE

Pz

T2~T4

dr1~dr14

Pg

Pi

dr2

dr6 dr5 dr3 dr4

T1

XAah

XAah

XAa2

XBa2


8/28

3-11

When LH multifunction switch was placed in high or low position, the pressure oil from pilot pump

flows through parking solenoid valve of transmission control valve to travel speed solenoid valve,

thus the transmission is changed into high or low speed condition.

6. TRAVEL SPEED CONTROL PRESSURE

PILOT PUMP

RELIEF VALVE

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVEHIGH

SPEED


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION




GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTERSTRAINER

T3

T2~T4

dr1~dr14

PgPi

dr2

dr6 dr5 dr3 dr4

T1

LOW

SPEED

TRAVELSPEEDVALVE

PARKINGSOLENOID


9/28

3-12

When the right control lever is pulled back, the boom spools in the main control valve are moved to

the raise position by the pilot oil pressure from the remote control valve.

The oil from the front and rear pump flows into the main control valve and then goes to the large

chamber of boom cylinders.

At the same time, the oil from the small chamber of boom cylinders returns to the hydraulic oil tank

through the boom spool in the main control valve. When this happens, the boom goes up.

When the boom is raised and the control lever is returned to the neutral position, the circuit for the

holding pressure at the bottom end of the boom cylinder is closed by the boom holding valve.This prevents the hydraulic drift of boom cylinder.

1. BOOM RAISE OPERATION

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


BOOM2 BOOM1

GAUGE BLOCK

FRONTPUMP

REARPUMP

BOOM HOLDINGVALVE

XBb2 XBb1

XAb1

Bb1

dr11

P1 P2 R

T1

P1Op

GROUP 4 SINGLE OPERATION


10/28

3-13

When the right control lever is pushed forward, the boom spools in the main control valve are moved

to the lower position by the pilot oil pressure from the remote control valve.

The oil from the rear pump flows into the main control valve and then goes to the small chamber of

boom cylinders. At the same time, the oil from the large chamber of boom cylinders returns to the

hydraulic tank through the boom spool in the main control valve.

When the lowering speed of boom is faster, the oil returned from the large chamber of boom cylinder

combines with the oil from the rear pump, and flows into the small chamber of the cylinder.

This prevents cylinder cavitation by the negative pressure when the rear pump flow can not match

the boom down speed. And the excessive pressure in the boom cylinder rod end circuit isprevented by the relief valve.

2. BOOM DOWN OPERATION

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


BOOM2

BOOM1

GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1

XAb1

Bb1

dr11

P1Op

XBb2

RELIEF VALVE

MAKE UP VALVE


11/28

3-14

When the left control lever is pulled back, the arm spools in the main control valve are moved to the

roll in position by the pilot oil pressure from the remote control valve.


chamber of arm cylinder.

At the same time, the oil from the small chamber of arm cylinder returns to the hydraulic oil tank

through the arm spool in the main control valve. When this happens, the arm rolls in.

The cavitation which will happen to the bottom of the arm cylinder is also prevented by the make-up

valve in the main control valve.

For arm half function, refer to page 3-10.

3. ARM ROLL IN OPERATION

XAa2XAa1

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


ARM1ARM2

GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1ARM HALF SOLENOID VALVE

XAah

XAa2

MAKEUPVALVE

RELIEFVALVE

XAh


12/28

3-15

When the left control lever is pushed forward, the arm spools in the main control valve are moved to

the roll out position by the pilot oil pressure from the remote control valve.

The oil from the front and rear pump flows into the main control valve and then goes to the small

chamber of arm cylinder.

At the same time, the oil from the large chamber of arm cylinder returns to the hydraulic oil tank

through the arm spool in the main control valve. When this happens, the arm rolls out.

The cavitation which will happen to the rod of the arm cylinder is also prevented by the make-up


4. ARM ROLL OUT OPERATION

ARM2

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON


ARM1

GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1

XBa1

XBa2XBa2

MAKEUPVALVE

RELIEFVALVE


13/28

3-16

When the right control lever is pulled left, the bucket spool in the main control valve is moved to the

roll in position by the pilot oil pressure from the remote control valve.

The center bypass valve is changed over by the pilot pressure(XAk2) and then the oil from the front

pump is joined to the flow of rear pump via confluence passage.


chamber of bucket cylinder.

At the same time, the oil from the small chamber of bucket cylinder returns to the hydraulic oil tank

through the bucket spool in the main control valve. When this happens, the bucket rolls in.

The cavitation which will happen to the bottom of the bucket cylinder is also prevented by the make-up valve in the main control valve.

5. BUCKET ROLL IN OPERATION

BUCKET

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON


GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1

XAk2

XAk

Ck2

Ck1 XAk2

CENTERBYPASS VALVE


14/28

3-17

When the right control lever is pushed right, the bucket spool in the main control valve is moved to

the roll out position by the pilot oil pressure from the remote control valve.

The oil from the rear pump flows into the main control valve and then goes to the small chamber of

bucket cylinder.

At the same time, the oil from the large chamber of bucket cylinder returns to the hydraulic oil tank

through the bucket spool in the main control valve. When this happens, the bucket rolls out.

The cavitation which will happen to the rod of the bucket cylinder is also prevented by the make-up


6. BUCKET ROLL OUT OPERATION

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON


BUCKET

GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1

XBk


15/28

3-18

When the dozer control lever is pulled back, the dozer spool in the main control valve is moved to the

dozer up position by the pilot oil pressure from the remote control valve.

The oil from the front pump flows into the main control valve and then goes to the small chamber of

dozer cylinders.

At the same time, the oil from the large chamber of dozer cylinders returns to the hydraulic oil tank

through the dozer spool in the main control valve. When this happens, the dozer goes up.

7. DOZER UP OPERATION

RCV LEVER(DOZER)

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


DOZER

GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1

PILOT CHECKVALVE

Pg

Pi

dr2

DOZER

LINE FILTER

XAdXBd

XBd

XAd


16/28

3-19

When the dozer control lever is pushed forward, the dozer spool in the main control valve is moved

to the dozer down position by the pilot oil pressure from the remote control valve.

The oil from the front pump flows into the main control valve and then goes to the large chamber of

dozer cylinders.

At the same time, the oil from the small chamber of dozer cylinders returns to the hydraulic oil tank

through the dozer spool in the main control valve. When this happens, the dozer blade is down.

8. DOZER DOWN OPERATION

PILOT PUMP

HYD TANK

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON


DOZER

GAUGE BLOCK

FRONTPUMP

REARPUMP

P1 P2 R

T1

SAFETYSOLENOIDVALVE

Pg

Pi

dr2

DOZER

RCV LEVER(DOZER)

LINE FILTER

SWING MOTOR

XBd

XAd

XAdXBd


17/28

3-20

When the left control lever is pushed left or right, the swing spool in the main control valve is moved

to the left or right swing position by the pilot oil pressure from the remote control valve.

The oil from the rear pump flows into the main control valve and then goes to the swing motor.

At the same time, the oil returned from the swing motor returns to the hydraulic oil tank through the

swing spool in the main control valve.

When this happens, the superstructure swings left or right.

The swing parking brake, make up valve and the overload relief valve are provided in the swing

motors. The cavitation which will happen to the swing motor is also prevented by the make-up valvein the swing motor itself.

9. SWING OPERATION

PILOT PUMP

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


SWING

T2~T4

dr1~dr14

Pg

Pi

T1

dr2

SWING ARM

RCV LEVER(LH)

GAUGE BLOCK

LINE FILTER

SPIN FILTER

STRAINER

A BMu

dr7Pg

Sh

FRONTPUMP

REARPUMP

XBs XAsSh

XBs

XAs

P1 P2 RP1 P2 R


18/28

3-21

SWING CIRCUIT OPERATION

PARKING BRAKE

BRAKE RELEASE VALVE

BRAKE OFFSh

Pg

BRAKE ON

BYPASS VALVE

MOTOR BRAKE VALVE

MAKE UP VALVE

BAMAKE UPPORT(Mu)

TO/FROM MAIN CONTROL VALVE

dr

MOTOR BRAKE VALVE

Motor brake valve for the swing motor limits to cushion the starting and stopping pressure of swing

operation.

MAKE UP VALVE

The make up valves prevent cavitation by supplying return oil to the vacuum side of the motor.

PARKING BRAKE

In case that the parking of the machine at slope is required during operation, there is the danger of

involuntary swing caused by the self weight of the machine. The brake is connected to prevent this

involuntary swing.

PARKING BRAKE "OFF" OPERATION

The parking brake is released by the pilot pressure oil from the pilot pump.

When the left control lever is placed in the swing position, the pilot pressure at the shuttle valve is

transferred to the brake release valve and the brake release valve is changed over. Then the pilot

pressure lifts the brake piston and releases the parking brake.

PARKING BRAKE "ON" OPERATION

When the control lever is placed in the neutral position, the pressure of the pilot oil passage goes

down.

Then the brake release valve is returned to the neutral position and the oil is returned from the

brake piston to the tank. And the brake is set to "ON".

BYPASS VALVE

This bypass valve absorbs shocks produced as swing motion stops and reduced oscillation cause

by swing motion.

1)

2)

3)

4)


19/28

3-22

When the LH multifunction switch is placed in forward or reverse position, the travel spool in the main

control valve is moved to the forward or reverse position by the pilot oil pressure from pilot pump

through the travel pilot solenoid of transmission control valve and travel Forward/Reverse solenoid

valve. The oil from the rear pump flows into the main control valve and then goes to the travel motor.

At the same time, the oil returned from the travel motor returns to the hydraulic oil tank through the

turning joint and travel spool in the main control valve.

When this happens, the machine moves forward or reverse.

The cavitation which will happen to the travel motor is prevented by the make-up valve in the main

control valve.

10. TRAVEL FORWARD AND REVERSE OPERATION

PILOT PUMP

HYD TANK

SAFETYSOLENOIDVALVE

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


T2~T4

dr1~dr14

Pg

Pi

T1

dr2




GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTER

STRAINER

FRONTPUMP

REARPUMP

P1 P2 R

TURNINGJOINT

XAt XBt

XAt

XBt

TRAVEL FORWARD/REVERSESOLENOID VALVE


20/28

3-23

TRAVEL CIRCUIT OPERATION

TRAVEL MOTOR

TO/FROM MAIN CONTROL VALVE

T

TB

TURNING JOINT

CHECK VALVE

COUNTER BALANCEVALVE

OVERLOAD

RELIEF VALVE

AB

Valves are provided on travel motors to offer the following functions.

COUNTER BALANCE VALVE

When stopping the motor on a slope descending, this valve prevents the motor from over running.

OVERLOAD RELIEF VALVE

Relief valve limits the circuit pressure below 350kgf/cm2 to prevent high pressure from being

generated at the time of stopping the machine. When stopping the motor, this valve sucks the oil

from lower pressure passage for preventing the negative pressure and the cavitation of the motor.

1)

2)


21/28

3-24

11. FRONT AND REAR AXLE BRAKE SYSTEM(SERVICE BRAKE)

PILOT PUMP

HYD TANK

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE

TRANSMISSONVALVE


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION

T2~T4

dr1~dr14

Pg

Pi

T1

dr2

GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTER

STRAINER

FRONTPUMP

REARPUMP

P1 P2 R

When the brake pedal(Valve) is pushed, the discharged oil from the gear pump flows into the front

and rear axle brake disc through the solenoid valve of brake supply valve.

This pressure is applied to axle brake disc, thus the brake is applied.


22/28

3-25

12. STEERING CIRCUIT OPERATION

PILOT PUMP

HYD TANK

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE


TRANSMISSON


ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION

T2~T4

dr1~dr14

Pg

Pi

T1

dr2

GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTER

STRAINER

FRONTPUMP

REARPUMP

P1 P2 R

STEERINGVALVE

P T2

STEERINGCYLINDER

SPOOL

GEROTOR

When the steering wheel is turned to the left or right, the spool within the steering valve turns left or

right hand direction : Because the spool is connected with steering column.

At this time, the oil discharged from the gear pump flows into steering cylinder through spool and

gerotor within the steering valve.

Then the steering direction is applied.


23/28

3-26

13. RAM LOCK CIRCUIT OPERATION

PILOT PUMP

HYD TANK

GEARPUMP

SWING MOTOR

BRAKE SUPPLYVALVE

BRAKE VALVE


TRANSMISSON

TRAVEL MOTOR DOZER CYL ARM CYL BOOM CYL BUCKET CYL

ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION

T2~T4

dr1~dr14

Pg

Pi

T1

dr2

GAUGE BLOCK

TRAVEL

LINE FILTER

SPIN FILTERSTRAINER

FRONTPUMP

REARPUMP

P1 P2 R

OSCILLATING CYL

LOCKING

VALVE

RAM LOCKSOLENOID

P1 T3

P

When the ram lock switch is selected, the ram lock solenoid is changed over.

Thus, the oil discharged from the pilot pump flows into oscillating cylinder through ram lock solenoid

and locking valve.

This pressure is applied to check valve and oscillating cylinder, thus the oscillating function is

operated(Ram lock released).


24/28

3-27

The oil from the front and rear pump flows through the neutral oil passage, bypass oil passage and

confluence oil passage in the main control valve. Then the oil goes to each actuator and operates

them. Check valves and orifices are located on these oil passage in the main control valve. These

control the oil from the main pumps so as to correspond to the operation of each actuator and

smooth the combined operation.

1. OUTLINE

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLY

VALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON

TRAVEL MOTOR

DOZER CYL ARM CYL BOOM CYL BUCKET CYL

ARM1

BOOM2

SWING

DOZER

ARM2

BOOM1

BUCKET

OPTION

GAUGE BLOCK

TRAVEL

FRONT

PUMP

REAR

PUMP

P1 P2 R

T1

GROUP 5 COMBINED OPERATION


25/28

3-28

When the swing and boom functions are operated, simultaneously the swing spool and boom spools

in the main control valve are moved to the functional position by the pilot oil pressure from the

remote control valve.

The oil from the rear pump flows into the boom cylinders through boom 1 spool in the right control

valve.

The oil from the front pump flows into the swing motor through swing spool.

At the same time, the pressure in the boom circuits can be high while the swing pressure is low,

therefore the oil from the front pump flows into the boom cylinders through boom 2 spool via

confluence passage in case of boom raise operation. The superstructure swings and the boom is

operated.

2. COMBINED SWING AND BOOM OPERATION

XBb2

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLY

VALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON

TRAVEL MOTOR


BOOM2

SWING

BOOM1

GAUGE BLOCK

FRONT

PUMP

REAR

PUMP

P1 P2 R

T1

XBs

XAs

dr10

OP

XAb1

XBb1


26/28

3-29

When the swing and arm functions are operated, simultaneously the swing spool and arm spools in

the main control valve are moved to the functional position by the pilot oil pressure from the remote

control valve. The oil from the front pump flows into the swing motor through swing spool and arm

cylinder through arm 1 spool.

At the same time, the pressure in the arm circuits can be high while the swing pressure is low,

therefore the oil from the rear pump flows into the arm cylinder through arm 2 spool via confluence

passage. The superstructure swings and the arm is operated.

Meanwhile the pilot oil pressure(XAas) of swing shuttle valve flows into the stroke limiter of armspool, then the swing priority is maintained.

3. COMBINED SWING AND ARM OPERATION

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLY

VALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON

TRAVEL MOTOR


ARM1

SWING

ARM2

GAUGE BLOCK

FRONT

PUMP

REAR

PUMP

P1 P2 R

T1

XBs

XAs

XAa2XAa1

XBa1

XBa2XBa2

XAah

ARM HALF SOLENOID VALVE

XAah

XAa2

FROM SWING LEVER

XBs XAs

Sh XAas

XAas


27/28

3-30

When the swing and bucket functions are operated, simultaneously the swing spool and bucket

spool in the main control valve are moved to the functional position by the pilot oil pressure from the

remote control valve.

The oil from the rear pump flows into the bucket cylinder through bucket spool in the right control

valve.

The oil from the front pump flows into the swing motor through swing spool in the left control valve.

The superstructure swings and the bucket is operated.

4. COMBINED SWING AND BUCKET OPERATION

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLY

VALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON

TRAVEL MOTOR


SWING BUCKET

GAUGE BLOCK

FRONT

PUMP

REAR

PUMP

P1 P2 R

T1

XBs

XAs

XBk

XAks

XAk


28/28

When the swing, boom, arm and bucket functions are operated, simultaneously each spool in the

main control valve is moved to the functional position by the pilot oil pressure from the remote control

valve. The oil from the rear pump flows into the boom cylinder, arm cylinder and bucket cylinder

through the boom 1 spool, arm 2 spool, bucket spool and the parallel and confluence oil passage in

the right control valve. The oil from the front pump flows into the swing motor, boom cylinder and arm

cylinder through the swing spool, boom 2 spool, arm 1 spool, and the parallel and confluence oil

passage in the left control valve. The superstructure swings and the boom, arm and bucket are

operated.

5. COMBINED SWING, BOOM, ARM AND BUCKET OPERATION

BOOM1XBb2

dr10

XAah

XAa1

PILOT PUMP

HYD TANK

SWING MOTOR

BRAKE SUPPLY

VALVE

BRAKE VALVE

TRANSMISSON

VALVE


TRANSMISSON

TRAVEL MOTOR


ARM1

BOOM2

SWING

DOZER

ARM2

BUCKET

OPTION

GAUGE BLOCK

TRAVEL

FRONT

PUMP

REAR

PUMP

P1 P2 R

T1

XBa1

XBa2

XAas

XAa2

XBa2

OP

XAb1

XBb1

XBs

XAs

XBk

XAk2

XAk

Pa1

Documents

Hyundai 130w-3 Hyd