U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-50
• Brake function
When the control valve is returned to the neutral position, the pressure oil from the pump is shut off, the
pressure in the ports P1 and P2 become the same, and the spring R (37) works to return the plunger (31-
1) to the neutral position. The opening of the plunger throttle becomes smaller when the plunger moves.
In addition, using an inertial force, the piston motor continues rotating (pumping action of motor). As a
result, the port M2-side pressure rises. When the plunger moves, the hydraulic oil in the pilot pressure
room L passes through the orifice L to control the speed of the plunger. In this manner, the speed of the
plunger is controlled so that the piston motor is stopped without causing cavitation, while absorbing a
shock pressure resulting from the inertial energy of the motor.
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