Table of Contents
Advertisement
10 Structure and function
Travel motor
Operation when travel lever is in neutral
When the travel lever is returned to NEUTRAL, the pressurized oil from the control valve is blocked.
Counterbalance valve (2) is returned to the right by the reaction force of spring (3).
The oil in chamber (D) flows into port (PA) through orifice (c). At this time, back pressure is generated by
the throttle effect of orifice (c), and it controls the speed of counterbalance valve (2) returning to the right.
The motor is stopped smoothly by gradually controlling the returning oil from port (MB) with the changing
speed and shape of the notch of counterbalance valve (2).
Even if the pressurized oil flowing into port (PA) is blocked, the motor continues to rotate with the inertial
force and cavitation can occur.
Since check valve (1a) is operated by a very small pressure, ports (PA) and (MA) are interconnected to
prevent cavitation.
10-126
PC88MR-10
Advertisement
Chapters
Table of Contents
Troubleshooting
