Hyundai r35z-7 Workshop Manual page 115

3. ARM ROLL IN 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 left control lever is pulled back, the arm spools in the main control valve are moved the to
roll in position by the pilot oil pressure from the remote control valve.
The oil from the P2 and P3 pump flows into the main control valve and then goes to the large
chamber of arm cylinder.
At the same time, the oil from small chamber of arm cylinder returns to the hydraulic oil tank through
the arm spool in the main control valve. When this happens, the arm rolls in.
The cavitation which will happen to the bottom of the arm cylinder is also prevented by the make-up
valve in the main control valve.
TRAVEL MOTOR-LH
R/H L/H
R/G
Ps Ps
a2 a2
T1 T2 T2 T1 P2(BW)
P1(FW)
TURNING JOINT
Pa8
Pa7 P1
Dr2 P2
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
2WAY OPTION SWING ARM
LH RH OUT IN
1 1 3 2 4
2
Pa3
Pa4 Pb3 Pb5
Pb4
Pa5
a1
DOZER CYL
ARM CYL
Pa6 Pa5 Pa4
ARM PTO
Pb6 Pb5 Pb4
BUCKET BOOM
IN OUT UP DOWN
3 1 2 4
Pb10 Pa10 Pb8
Pa8
3-12
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
A1 A2
R1 A4
S1 S1
B/SWING CYL
Pa1
DOZER
Pb1
A3
LINE FILTER
R35Z73HC12