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SYSTEMS OPERATION
[FORWARD 1ST SPEED positionj
1. Prefihling of 1st-speed clutch piston
chamber
When the transmission control lever is moved
from neutral to forward 1st speedposition, speed
selector valve 3 moves to 1st speed position and
directional selector valve 6 to forward position,
uncovering 1st-speed clutch port (Cl) and for
ward clutch port (CF) respectively.
Under this condition, the pressure is being ap
plied to the 1st-speed clutch piston chamber but
it is not applied to the forward clutch chamber
yet.
The moment the oil in accumulator valve pres
sure chamber 4 enters theist-speed clutch piston
chamber for prefiuing, accumulator valve 1 re
turns to the right end to uncover main port 2.
Now, a circuit bypassing main orifice 5 is formed
to assist in prefilling the 1st-speed clutch piston
chamber.
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