584Fluid flow in drive range second gear

As for drive range — first gear, the main regulator valve and throttle pressure valve function as for neutral and park.

When the manual selector valve is positioned in D, line pressure is directed to the 1-2 shift valve, 2-3 shift valve and to the forward clutch which it applies.

The rising governor pressure imposes itself against one end of the 1-2 governor plug counteracting throttle pressure until at some predetermined pressure difference the valve shifts across. This then permits line pressure to flow to the accumulator and the second gear servo piston thus causing the second gear brake band to be applied.

At the same time, full line pressure is applied to the left hand end of the main pressure regulating valve so that there will be a further decrease in line pressure relative to drive range - first gear operating conditions.

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