Group 4 Single Operation - Hyundai r35z-7 Workshop Manual

GROUP 4 SINGLE OPERATION

1. BOOM UP OPERATION
TRAVEL MOTOR-RH
R/G
a1
P2(FW) P1(BW)
BOOM CYL
BUCKET CYL
Pa10
Pb8'
BUCKET
MAIN CONTROL VALVE
T2
Pb10
B/SWING
ACC
A1 A2 A2
LH RH
1 2
P
Pa2 Pb2
T
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 P1 and P3 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. 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.
TRAVEL MOTOR-LH
R/H L/H
R/G
Ps Ps
a2 a2
P2(BW) P1(FW)
T1 T2 T2 T1
BOOM
TURNING JOINT
HOLDING
VALVE
Pa8
Pa7 P1 P2
Dr2
BOOM
TRAVEL-RH TRAVEL-LH
Pb7 Dr1
Pb8
TRAVEL
DOZER
L/H R/H
DOWN UP
2
1 4 3 1 2
Pb1 Pa1
Pb6 Pa6 Pb7 Pa7
SWING
2WAY OPTION ARM
LH RH OUT IN
1
1 2 3 2 4
Pa3 Pb5
Pa4 Pb3
Pb4
Pa5
a1
DOZER CYL
ARM CYL
Pa6 Pa5 Pa4
ARM PTO
Pb6 Pb4
Pb5
BUCKET BOOM
IN OUT UP DOWN
1 2 4
3
Pb10 Pa10 Pb8
Pa8
3-10
SWING MOTOR
DB PB
"R2"
"R1"
STOP VALVES
GA B(CCW) A(CW) GB
Mu
P3 Pa3 Pa2
Dr1
BOOM
SWING SWING
T1
Pb3 Pb2
BU Pp1
PILOT PUMP
MAIN PUMP
R1 A1 A2 A4
S1 S1
B/SWING CYL
Pa1
DOZER
Pb1
A3
LINE FILTER
R35Z73HC10