Reverse
In Reverse, transaxle drive is via the input shaft and the clutch B. the elements of the transaxle function as follows;
The B clutch is engaged and drives the reverse sun gear in a clock-wise direction.
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The D band is engaged and holds the planetary gear carrier(front, rear) stationary causing the differential pinion to rotate clockwise.
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The differential rotate anti-clockwise direction.
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The output shaft drives it in an anti-clockwise or reverse direction.
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Control
Clutch B(remain)
The line pressure, which is supplied to oil pump, is directly engage. This time the place of check ball is change.
Brake D engaged
he line pressure, which engaged clutch, B is waiting at the 91port of clutch valve D.