Máy đào Huyndai R480, 520LC - P3

Shop manual máy đào Huyndai R480, 520LC Phần thủy lực

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

GROUP 3 PILOT CIRCUIT

Relief valve 40kgf/cm

RCV pedal Remote control valve

(LH lever)

Remote control valve (RH lever)

Safety lock solenoid valve

Swing parking brake

MCV

Travel speed solenoid valve

Main pump

2

Power boost solenoid valve

Line filter

Boom priority EPPR valve

48093CI01

The pilot pump receive 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 remote control valve through safety solenoid valve

The return oil from remote control valve returned to hydraulic tank

1 SUCTION, DELIVERY AND RETURN CIRCUIT

STRAIGHT TRAVEL TRAVEL-LH BOOM1

BUCKET ARM2 ARM1

OPTION

TRAVEL-RH

BOOM2

SWING

P3 Pa6

T

PG (S/Motor) A1 A2

A3

P1

P4 A5

SWING MOTOR

TRAVEL MOTOR

TRAVEL

HYDRAULIC TANK

FRONT PUMP REAR PUMP PILOT

LINE FILTER

ARM CYLINDER

BUCKET CYLINDER CYLINDERBOOM

A1 A2 Dr#, dr#

PP(MCV)

(4) (1)

Pb6 Pb1 Pa1

(4) (1) (3) (2)

RCV PEDAL

(4) (1) (2) (3)

Pb5 Pb8 Pa8

Pa2

Pb2

SAFETY SOLENOID VALVE Pc6

(MCV) Pk (T/Joint) PH (MCV)

PS

PS PS

T3 T1 T2 T4

pa10

B9 A9

pb9 pa9 B8

pb8

pa8

DR2 pc2 A7

pa7 pb7

B6

pb6

pa6

P3 P2

PH

PA

PP

PT P1 pr1

pa1

A1

pc6 DR3 pb2

A2 pa3 B3 A3

pa4 pb4

A4

A5 B5 pc1 DR1 pa11

PS

pc2 pa3 pa11

pb9

PO

PS

SH

pa5 pci

pb3

48093HC02

P3 Pa6

T

PG (S/Motor) A1 A2

A3

P1 P4 A5

SWING MOTOR

TRAVEL MOTOR

TRAVEL

HYDRAULIC TANK

FRONT PUMP REAR PUMP PILOT

LINE FILTER

ARM CYLINDER

BUCKET CYLINDER CYLINDERBOOM

A1 A2 Dr#, dr#

PP(MCV)

(4) (1)

Pb6 Pb1 Pa1

(4) (1) (3) (2)

RCV PEDAL

(4) (1) (2) (3)

P T

Pb5 Pb8 Pa8

Pa2

Pb2

SAFETY SOLENOID VALVE Pc6

(MCV) Pk (T/Joint) PH (MCV)

LEVER UP

PS

SH

pb8

pc1

PS

SH

pa7 pb7

STRAIGHT TRAVEL TRAVEL-LH BOOM1

BUCKET ARM2 ARM1

OPTION

TRAVEL-RH

BOOM2

SWING

PS PS

T3 T1 T2 T4

pa10

B9 A9

pb9 pa9 B8

pb8

pa8

DR2 pc2 A7

pa7

B6

pb6

pa6

P3 P2

PH

PA

PP

PT P1 pr1

pa1

A1

pc6 DR3 pb2

A2 pa3 B3 A3

pa4 pb4

A4

A5 B5 pc1 DR1 pa11

PS

pc2 pa3 pa11

pb9

PO pa5 pci

pb3

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 moved upward, oil does not flows into the remote control valve, because of blocked by the spool

2 SAFETY SOLENOID VALVE

2 SAFETY SOLENOID VALVE (SAFETY LEVER)

48093HC03

3 BOOM PRIORITY SYSTEM

BOOM PRIORITY EPPR VALVE

P3 Pa6

T

PG (S/Motor)

A1 A2

A3

P1 P4 A5

SWING MOTOR

TRAVEL MOTOR

TRAVEL

HYDRAULIC TANK

FRONT PUMP REARPUMP

PILOT

LINE FILTER

ARM CYLINDER CYLINDERBUCKET

BOOM CYLINDER

A1 A2 Dr#, dr#

PP(MCV)

(4) (1)

Pb6 Pb1 Pa1

(4) (1) (3) (2)

RCV PEDAL

(4) (1) (2) (3)

P T

Pb5 Pb8 Pa8

Pa2

Pb2

Pc6 (MCV) (T/Joint)Pk (MCV)PH

PS

STRAIGHT TRAVEL TRAVEL-LH BOOM1

BUCKET ARM2 ARM1

OPTION

TRAVEL-RH

BOOM2

SWING

PS PS

T3 T1 T2 T4

pa10

B9 A9

pb9 pa9 B8

pb8

pa8

DR2 pc2 A7

pa7 pb7

B6

pb6

pa6

P3 P2

PH

PA

PP

PT P1 pr1

pa1

A1

pc6 DR3 pb2

A2 pa3 B3 A3

pa4 pb4

A4

A5 pc1 DR1 pa11

PS

pc2 pa3 pa11

pb9

PO pa5 pci

pb3

48093HC04 When carrying out the combined operation of swing and boom up, the boom up operating speed is lowered then normal operation

To increase working efficiency, swing speed reducing system is used

The pilot oil from pilot pump flow into Pc6 Pc6 port in main control valve through boom EPPR valve Pc6 Pc6 oil pressure moves swing reducing spool to right direction and oil flow rate to the swing motor decreased

Then, the boom up speed is increased This is called the boom priority system

When the travel speed switch is pushed, the travel speed solenoid valve is actuated and the discharged oil from the pilot pump flows to the XX port of pilot valve in the travel motors

As a result, the control piston is pushed by the main oil flow, thus the displacement is minimized When the travel speed switch is pushed once more, the travel speed solenoid valve is return to original position by the force of spring, the hydraulic oil of XX port returns to the hydraulic tank

As a result, the control piston is returned by the main oil flow, thus the displacement is maximized

4 TRAVEL SPEED CONTROL

4 TRAVEL SPEED CONTROL SYSTEM SYSTEM

P3 Pa6

T

PG (S/Motor) A1 A2

A3

P1 P4 A5

SWING MOTOR

TRAVEL MOTOR

TRAVEL

HYDRAULIC TANK

FRONT PUMP REAR PUMP PILOT

LINE FILTER

ARM CYLINDER CYLINDERBUCKET

BOOM CYLINDER

A1 A2 Dr#, dr#

PP(MCV)

(4) (1)

Pb6 Pb1 Pa1

(4) (1) (3) (2)

RCV PEDAL

(4) (1) (2) (3)

Pb5 Pb8 Pa8

Pa2

Pb2

Pc6 (MCV) (T/Joint)Pk (MCV)PH

PS

TRAVEL SPEED SOLENOID VALVE

Pk

Dr

S MA

B A

RH

R/G

MB X

Bre

S

MA

B

A

LH

R/G

MB X T

Bre

T

pb8

STRAIGHT TRAVEL TRAVEL-LH BOOM1

BUCKET ARM2 ARM1

OPTION

TRAVEL-RH

BOOM2

SWING

PS PS

T3 T1 T2 T4

pa10

B9 A9

pb9 pa9 B8

pb8

pa8

DR2 pc2 A7

pa7 pb7

B6

pb6

pa6

P3 P2

PH

PA

PP

PT P1 pr1

pa1

A1

pc6 DR3 pb2

A2 pa3 B3 A3

pa4 pb4

A4

A5 pc1 DR1 pa11

PS

pc2 pa3 pa11

pb9

PO pa5 pci

pb3

48093HC05

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 flow into PH port of the main relief valve of main control valve ; Then the setting pressure of the main control valve is raises from 330 kgf/cm2 to 360 kgf/

cm2 for increasing the digging power And even when press continuously, it is canceled after 8

5 MAIN RELIEF PRESSURE CHANGE CIRCUIT

POWER MAX SOLENOID VALVE

Auto power boost

P3 Pa6

T

PG (S/Motor) A1

A2 A3

P1 P4 A5

SWING MOTOR

TRAVEL MOTOR

TRAVEL

HYDRAULIC TANK

FRONT PUMP REARPUMP

PILOT

LINE FILTER

ARM CYLINDER CYLINDERBUCKET

BOOM CYLINDER

A1 A2 Dr#, dr#

PP(MCV)

(4) (1)

Pb6 Pb1 Pa1

(4) (1) (3) (2)

RCV PEDAL

(4) (1) (2) (3)

Pb5 Pb8 Pa8

Pa2

Pb2

Pc6 (MCV) (T/Joint)Pk (MCV)PH

PS

STRAIGHT TRAVEL TRAVEL-LH BOOM1

BUCKET ARM2 ARM1

OPTION

TRAVEL-RH

BOOM2

SWING

PS PS

T3 T1 T2 T4

pa10

B9 A9

pb9 pa9 B8

pb8

pa8

DR2 pc2 A7

pa7 pb7

B6

pb6

pa6

P3 P2

PH

PA

PP

PT P1 pr1

pa1

A1

pc6 DR3 pb2

A2 pa3 B3 A3

pa4 pb4

A4

A5 pc1 DR1 pa11

PS

pc2 pa3 pa11

pb9

PO pa5 pci

pb3

48093HC06

6 SWING PARKING BRAKE RELEASE

P3 Pa6

T

PG (S/Motor) A1 A2

A3

P1 P4 A5

TRAVEL MOTOR

TRAVEL

HYDRAULIC TANK

FRONT PUMP REARPUMP

PILOT

LINE FILTER

ARM CYLINDER CYLINDERBUCKET CYLINDERBOOM

A1 A2 Dr#, dr#

PP(MCV)

(4) (1)

Pb6 Pb1 Pa1

(4) (1) (3) (2)

P T

RCV PEDAL

(4) (1) (2) (3)

P T

Pb5 Pb8 Pa8

Pa2

Pb2

Pc6 (MCV) Pk (T/Joint) PH (MCV)

PS

SWING MOTOR

SH

Au

GB

SH

PG

Dr GA

B(cw) A(ccw)

Au

GB

SH

PG

Dr

GA

B(cw)

A(ccw)

PG

STRAIGHT TRAVEL TRAVEL-LH BOOM1

BUCKET ARM2 ARM1

OPTION

TRAVEL-RH

BOOM2

SWING

PS PS

T3 T1 T2 T4

pa10

B9 A9

pb9 pa9 B8

pb8

pa8

DR2 pc2 A7

pa7 pb7

B6

pb6

pa6

P3 P2

PH

PA

PP

PT P1 pr1

pa1

A1

pc6 DR3 pb2

A2 pa3 B3 A3

pa4 pb4

A4

A5 pc1 DR1 pa11

PS

pc2 pa3 pa11

pb9

PO pa5 pci

pb3

48093HC07

When one of the RCV lever (except travel lever) is tilted, the pilot oil flows into SH port through main control valve

This pressure moves spool so, discharged oil from pilot valve flows to swing motor PG port

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

When all of the RCV lever are set in the neutral position, oil in the swing motor disc cylinder is drained, thus the brake is applied