The opposite occurs when the upper solenoid directs the flow of oil
to the reservoir and reverse pressure (on the top) moves the valve up
against spring force.
Figure 1-45.
Forward Shift Valve.
ae. Reverse Shift Valve (fig. 1-46). This valve assembly consists
of a valve, stop, and a calibrated spring in a bore.
Two solenoids control the movement of this valve.
One controls the
flow of oil to the bottom of the valve; the other controls the flow
of oil to the top of the valve. When directing main pressure to the
reservoir from the bottom of the valve, spring force pushes the valve
down and allows the reverse pressure between the lower lands to
reservoir. This also allows main pressure to flow between the upper
land area, and forward clutch pressure to flow through the bottom
land area.
The opposite occurs when the upper solenoid directs the flow of oil
to the reservoir and reverse pressure (on the top) moves the valve up
against spring force.
This allows fourth clutch pressure (when
present) to flow through the top land area and main pressure to flow
through the bottom land area.
46
OD1710
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