Hyundai R 160 LC-3, Service Manual

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When the travel lever return to neutral position, the oil from the main pump is blocked, and the plunger
return the neutral position by spring force.
But the motor is rotated by inertia, so the pressure at the output port of motor rises, then motor is
braked.
If the pressure reaches the set pressure of relief valve, oil flows into port M
1
. As a result, the shock
pressure caused by inertia force is released and prevent cavitation of port M
1
.
Brake function (3)
P
1
P
3
P
2
M
1
M
2