U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-16
d. Arm regeneration circuit
(1) Arm dump
(2) Arm crowd
• When oil flows through the hydraulic pilot passage shown at left above, the spool shifts rightward
and the neutral passage gets closed. The pressure oil goes through the parallel feeder, pushes up
the load check valve and flow on to the cylinder bottom.
• Part of return oil from the cylinder bottom flows through the spool throttle first and then through the
low-pressure passage, returning to the tank. The remaining oil pushes the check valve open and
reaches the cylinder bottom.
Arm dump
Pilot secondary
pressure
Arm crowd
Pilot secondary
pressure
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