Kubota WSM L3540-II, Руководство по ремонту, Страница: 217 / 672

TRANSMISSION L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
3-M17
Shift Check Valve
The shift check valves (2), (3), (4), (5), (6) are
provided on each shift piston and the shuttle shift rod.
From the start to the end of gear shifting, the shift
check valves (2), (4), (5), (6) of the shift pistons are
opened because the ball (9) of the check pin (18) is on
the straight portion, the oil in the pilot circuit of the clutch
valve passes through the shift check valves (2), (3), (4),
(5), (6) to be drained into the tank, causing the GST
clutch to be disengaged.
When the gear shifting is completed, the ball (9) of
the check pin (18) enters the groove of the shift piston;
the check valve is closed, causing the pilot circuit
pressure to rise and the clutch valve to open. Thus, the
oil flows into the GST clutch to engage it. The 1-2 shift
check valve (6) and 3-4 shift check valve (5) compose a
serial circuit. When either valve is closed, the oil in the
pilot circuit will not be drained into the tank.
In case of the shuttle shifting, the shift check valve
(3) is opened and closed by the groove of the shuttle shift
rod.
Note that the shuttle shift fork rod has a slot into
which the shift fork mounting bolt is inserted. Therefore,
when the shuttle shift lever is moved, the shuttle shift fork
rod is moved before the shuttle shift fork is moved,
disengaging the clutch pack and thus moving the shuttle
shift fork.
9Y1211167TRM0025US0
(1) GST Valve Cover
(2) Main Range Shift Check
Valve
(3) Shuttle Shift Check Valve
(4) Sub-range Shift Check Valve
(5) 3-4 Shift Check Valve
(6) 1-2 Shift Check Valve
(7) GST Valve Body
(8) Sub-range Check Pin
(9) Ball for Detent
(10) Main Range Check Pin
(11) Shuttle Check Pin
(12) 3-4 Check Pin
(13) Pin
(14) 1-2 Check Pin
(15) Shift Piston (Sub-range Shift)
(16) Ball
(17) Spring
(18) Check Pin
KiSC issued 02, 2015 A