Máy đào Huyndai R480, 520LC - P3
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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.
GROUP 3 PILOT CIRCUITGROUP 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
Pilot pump
Suction filter
MCV
Travel speed solenoid valve
Main pump
2
Power boost solenoid valve
Line filter
Boom priority EPPR valve
48093CI01
3-6
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 CIRCUIT1. SUCTION, DELIVERY AND RETURN CIRCUIT
STRAIGHT
TRAVEL
TRAVEL-LH
BOOM1
BUCKET
ARM2
ARM1
OPTION
TRAVEL-RH
BOOM2
SWING
P3
P2
Pa6
T
PG
(S/Motor)
A1
A2
A3
P1
P4
A5
SWING MOTOR
TRAVEL MOTOR
TRAVEL
HYDRAULIC TANK
FRONT
PUMP
REAR
PUMP
PILOT
PUMP
LINE FILTER
ARM
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDER
A1
A2
Dr#, dr#
PP(MCV)
(4)
(1)
(2)
(3)
P
T
Pb6
Pa1Pb1
(4)
(1)
(2)
(3)
P
T
RCV PEDAL
SWING
ARM
BUCKET
BOOM
(4)
(1)
(2)
(3)
P
T
abd e f
g
hj
Pb5
Pb8
Pa8
Pa2
Pb2
Pa5
Pa7
Pb7
c
d1
h1
PS PS
SAFETY
SOLENOID
VALVE
Pc6
(MCV)
Pk
(T/Joint)
PH
(MCV)
PS
ps1
ps2
PSPS
T3
T1
T2
T4
pa10
B9
A9
pb9
pa9
B8
A8
pb8
pa8
DR2
pc2
A7
B7
pa7
pb7
B6
A6
pb6
pa6
P3
P2
PH
PA
PP
PT
P1
pr1
pa1
pb1
A1
B1
pc6
pa2
DR3
pb2
A2
B2
pa3
pb3
B3
A3
pa4
pb4
A4
B4
A5
B5
pc1
DR1
pa11
PS
pc2
pa3
pa11
pb9
pb5
PO
PS
SH
pa5
pa9
pci
pb3
48093HC02
P3
P2
Pa6
T
PG
(S/Motor)
A1
A2
A3
P1
P4
A5
SWING MOTOR
TRAVEL MOTOR
TRAVEL
HYDRAULIC TANK
FRONT
PUMP
REAR
PUMP
PILOT
PUMP
LINE FILTER
ARM
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDER
A1
A2
Dr#, dr#
PP(MCV)
(4)
(1)
(2)
(3)
P
T
Pb6
Pa1Pb1
(4)
(1)
(2)
(3)
P
T
RCV PEDAL
SWING
ARM
BUCKET
BOOM
(4)
(1)
(2)
(3)
P
T
abd e f
g
hj
Pb5
Pb8
Pa8
Pa2
Pb2
Pa5
Pa7
Pb7
c
d1
h1
PS PS
SAFETY
SOLENOID
VALVE
Pc6
(MCV)
Pk
(T/Joint)
PH
(MCV)
PS
LEVER DOWN
LEVER UP
PS
SH
pb8
pc1
PS
SH
pa7
pb7
STRAIGHT
TRAVEL
TRAVEL-LH
BOOM1
BUCKET
ARM2
ARM1
OPTION
TRAVEL-RH
BOOM2
SWING
ps1
ps2
PSPS
T3
T1
T2
T4
pa10
B9
A9
pb9
pa9
B8
A8
pb8
pa8
DR2
pc2
A7
B7
pa7
B6
A6
pb6
pa6
P3
P2
PH
PA
PP
PT
P1
pr1
pa1
pb1
A1
B1
pc6
pa2
DR3
pb2
A2
B2
pa3
pb3
B3
A3
pa4
pb4
A4
B4
A5
B5
pc1
DR1
pa11
PS
pc2
pa3
pa11
pb9
pb5
PO
pa5
pa9
pci
pb3
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 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
3-8
3. BOOM PRIORITY SYSTEM3. BOOM PRIORITY SYSTEM
BOOM PRIORITY
EPPR VALVE
P3
P2
Pa6
T
PG
(S/Motor)
A1
A2
A3
P1
P4
A5
SWING MOTOR
TRAVEL MOTOR
TRAVEL
HYDRAULIC TANK
FRONT
PUMP
REAR
PUMP
PILOT
PUMP
LINE FILTER
ARM
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDER
A1
A2
Dr#, dr#
PP(MCV)
(4)
(1)
(2)
(3)
P
T
Pb6
Pa1Pb1
(4)
(1)
(2)
(3)
P
T
RCV PEDAL
SWING
ARM
BUCKET
BOOM
(4)
(1)
(2)
(3)
P
T
abd e f
g
hj
Pb5
Pb8
Pa8
Pa2
Pb2
Pa5
Pa7
Pb7
c
d1
h1
PS PS
Pc6
(MCV)
Pk
(T/Joint)
PH
(MCV)
PS
STRAIGHT
TRAVEL
TRAVEL-LH
BOOM1
BUCKET
ARM2
ARM1
OPTION
TRAVEL-RH
BOOM2
SWING
ps1
ps2
PSPS
T3
T1
T2
T4
pa10
B9
A9
pb9
pa9
B8
A8
pb8
pa8
DR2
pc2
A7
B7
pa7
pb7
B6
A6
pb6
pa6
P3
P2
PH
PA
PP
PT
P1
pr1
pa1
pb1
A1
B1
pc6
pa2
DR3
pb2
A2
B2
pa3
pb3
B3
A3
pa4
pb4
A4
B4
A5
B5
pc1
DR1
pa11
PS
pc2
pa3
pa11
pb9
pb5
PO
pa5
pa9
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.
3-93-9
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 SYSTEMSYSTEM
P3
P2
Pa6
T
PG
(S/Motor)
A1
A2
A3
P1
P4
A5
SWING MOTOR
TRAVEL MOTOR
TRAVEL
HYDRAULIC TANK
FRONT
PUMP
REAR
PUMP
PILOT
PUMP
LINE FILTER
ARM
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDER
A1
A2
Dr#, dr#
PP(MCV)
(4)
(1)
(2)
(3)
P
T
Pb6
Pa1Pb1
(4)
(1)
(2)
(3)
P
T
RCV PEDAL
SWING
ARM
BUCKET
BOOM
(4)
(1)
(2)
(3)
P
T
abd e f
g
hj
Pb5
Pb8
Pa8
Pa2
Pb2
Pa5
Pa7
Pb7
c
d1
h1
PS PS
Pc6
(MCV)
Pk
(T/Joint)
PH
(MCV)
PS
TRAVEL SPEED
SOLENOID VALVE
Pk
A
C
B
D
P
Dr
S
MA
Reverse
Forward
B
A
RH
R/G
MB
X
Bre
S
MA
Reverse
Forward
B
A
LH
R/G
MB
X
T
Bre
T
pb8
STRAIGHT
TRAVEL
TRAVEL-LH
BOOM1
BUCKET
ARM2
ARM1
OPTION
TRAVEL-RH
BOOM2
SWING
ps1
ps2
PSPS
T3
T1
T2
T4
pa10
B9
A9
pb9
pa9
B8
A8
pb8
pa8
DR2
pc2
A7
B7
pa7
pb7
B6
A6
pb6
pa6
P3
P2
PH
PA
PP
PT
P1
pr1
pa1
pb1
A1
B1
pc6
pa2
DR3
pb2
A2
B2
pa3
pb3
B3
A3
pa4
pb4
A4
B4
A5
B5
pc1
DR1
pa11
PS
pc2
pa3
pa11
pb9
pb5
PO
pa5
pa9
pci
pb3
48093HC05
