Speed change
(1) Low speed
-No pressure at pi port
-Supply pressure H is supplied to S
(2) High speed
-Pilot pressure at pi port
-Speed change spool is moved downward
-Supply pressure H is supplied to L port
(3) Automatic downshift
-Pilot pressure at pi port
-Supply pressure reaches to 265bar(B)
-Speed change spool is pushed upward against pi pressure, Supply pressure H is connected to S port.
Picture text:
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