(1) Forward operation - Brakes Released (OFF)(fig. A-8).
Spring force, which blocks main pressure from entering the brake
apply circuit and brake signal circuit, holds the brake apply
regulator in the "off" position.
The primary brake coolant valve, positioned in its bore by spring
force, allows cooler-out oil to pass through the valve to provide
lubrication.
The reverse signal valve is positioned in its bore by the calibrated
spring.
Spring force and cooler-out oil position the secondary brake coolant
valve in its bore. The output pump oil fills the opposite area.
The output pump signal valve, positioned in its bore by spring force,
directs converter-in pressure to the output pump bypass valve.
The
movement of the output pump bypass valve (converter-in pressure
greater than spring force) allows the output pump oil to "bypass" the
reservoir.
Main pressure, directed to the top of the priority valve, holds this
valve down providing full-flow feed to the clutches.
The main boost plug is held down in its bore due to the absence of
brake apply pressure.
The lockup cutoff valve is positioned in its bore by spring force.
(2) Forward operation - Brakes Applied (ON)(fig. A-9).
The
brake apply lever moves the brake apply regulator against its spring
through a mechanical linkage from the service brake pedal. Movement
of the valve directs main pressure to the brake apply circuit and the
brake signal circuit.
Brake signal pressure moves the primary brake coolant valve and
allows cooler-out oil to the brake coolant circuit. Lubrication then
feeds through an orifice.
Spring force acting on the reverse signal brake valve positions it in
its bore and allows brake signal pressure to pass through to the
secondary brake coolant valve.
Brake signal pressure moves the secondary brake coolant valve and
allows output pump oil to the brake coolant circuit through the brake
coolant valve.
Brake signal pressure also moves the output pump
signal valve, cutting off the flow of converter-in oil to the output
pump bypass valve.
55
OD1710
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