586Fluid flow in first gear manual selection

With the manual selector in '1' position, line pressure passes to the forward clutch piston and accordingly applies the clutch plates. Line pressure from the manual selector valve moves the ball valve for the first gear manual range so that it cuts off throttle pressure to the 1-2 shift valve. Line pressure is therefore able to pass through the ball valve for first and reverse gear to the 1-2 governor plug, the soft engagement valve and finally passing to the first and reverse brake piston to engage the brake plates.

Consequently, line pressure will fill the normal throttle pressure lines of 1-2 shift valve and will react against the left hand end of the valve. This then prevents governor pressure at the opposite end acting on the governor plug moving the valve for a 1-2 upshift.

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