Group 4 Single Operation - Hyundai HX140L Manual

GROUP 4 SINGLE OPERATION

1. BOOM UP OPERATION
When the right control lever is pulled back, the boom spools in the main control valve are moved to
the up position by the pilot oil pressure from the remote control valve.
The oil from the A1 and A2 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 1 spool in the main control valve. When this
happens, the boom goes up. The excessive pressure in the boom cylinder head side is prevented
by relief valve. When the boom is up and the control lever is returned to neutral position, the circuit
for the holding pressure at the head side of the boom cylinder is closed by the boom holding valve.
This prevents the hydraulic drift of boom cylinder.
C6
D6
Pc6
TURNING
JOINT
Pd6
Puo
C5
D5
Pc5
Pd5
DR5
Po5
C4
D4
DR3
Pc41
Pc40
Pd40
Pd41
V3
Pc3
DR2
Pa21
Pa20
P04
C2
D2
Pc2
Pd2
DR4
P03
C1
D1
Pc1
Pd1
DR0
P0
PS
Ai
Pd0
Rs
OPTION C
(DOZER)
OPTION B
ARM 1
BOOM 2
SWING
RELIEF
VALVE
TRAVEL
RIGHT
TRAVEL
STRAIGHT
P3 P1
3-15
Pi1(Pump) Pi2(Pump)
Pn2 Pn1
BUCKET
ARM
REGEN
BOOM
HOLDING
VALVE
ARM 2
BOOM 1
TRAVEL
LEFT
P2
B5
A5
Pb5
Pa5
P04
B4
Pb4
Pa4
Pc42
Pc40
Pc41
Pb3
Pd41
B2
A2
Pb21
DR1
Pb20
Pa20
P02
PS
Patt
B1
A1
Pb1
Pa1
T1
140L3HC10