U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-18
(2) Boom up (with port Pa under pressure)
When the boom is lifted, the oil from the pilot valve is introduced into the port Pa and the control valve
spool is moved to the lift.
The hydraulic oil from the pump flows through parallel passage, pushing load check valve. The oil then
flows through the passage "a", pushing up the anti-drift poppet. The oil further goes through the port A.
The return oil from the port B comes through the throttle into the tank.
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