Group 4 Single Operation - Hyundai HX430L Manual

GROUP 4 SINGLE OPERATION

1. BOOM UP OPERATION
TRAVEL MOTOR
SWING MOTOR
When the RH 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 bottom end circuit 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 bottom end of the boom cylinder is closed by the boom holding valve.
This prevents the hydraulic drift of boom cylinder.
ARM
CYLINDER
(P3)
N2
Pca
Dr3
P2c2
Ba
Aa
PAa
ARM 1
PBa
Bo
Ao
PAo
OPTION
PBo
(Ck2)
Drb
PBb2
BOOM 2
PSp
Dra
Bs
As
PAs
PBs SWING
Dr4
Pns
Br
Ar
TRAVEL(RH)
PAr
PBr
T1
R3
3-14 3-14
BUCKET BOOM
CYLINDER CYLINDER
(P4)
N1
Pcb
PAa2
ARM 2
PBa2
Ac
Bc
PAcs
PAc
BUCKET
PBc
Dr3'
P2c1
Boom holding
valve
Bb
Relief valve
Ab
PAb
BOOM 1
PBb
P
Px
AL
BL
PAL
TRAVEL(LH)
PBL
Py
PS
(PTb)
PL1
R4
Pa P2g P1 P1g
P2
PS
SH
380L3HC10