U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-55
(2) Circuit behavior
1) Motor start-up
When the hydraulic pressure is applied to P1, the counterbalance valve spool overcomes the
spring’s counter-force and shifts to the right as shown in the figure below. In the meanwhile, the
valve switches from M2 to P2, which gets the motor started. (Usual counterbalance action)
At the same time, the oil passage A goes under high pressure. Thanks to the action of the check
valve C, however, the pressure oil is kept from leaking out toward the low-pressure side (oil pas-
sage C).
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