Hyundai r35z-7 Workshop Manual page 82

2)
COUNTERBALANCE VALVE
Spring L(37)
Spring R(37)
Orifice L(40)
Orifice R(40)
Control valve
P1 P2
Spring L(31-3)
Spring R(31-3)
M1 M2
Check valve L(31-2) Check valve R(31-2)
Motor
Plunger(31-1) Plunger notch portion
R35Z72TM04
The counterbalance valve is provided to stop the axial piston motor and to prevent overrun. When
the control valve is set to the neutral position, there is no pressure in the ports P1 and P2, and ports
M1 and M2 are blocked by plunger (31-1) and check valve (31-2), consequently the motor does not
start rotating.
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