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PART 7-1
AUTOMATIC TRANSMISSION (Borg-Warner)
7-9
FIG. 9 -Inhibitor Switch Operating Lever
moves the 1-2 shift valve to first gear
position. The front servo apply cir-
cuit is exhausted at the 1-2 shift valve
and at the same time control pressure
in line 6 from the manual valve is re-
directed to apply the rear servo.
The transmission will now remain
in first gear until another drive range
is selected manually.
3-1
SHIFT AT SPEED
Rear clutch apply and front servo
release circuits are exhausted at the
manual valve.
The front clutch and the front
servo are now applied giving 2nd
gear.
The control pressure in lines 12
and 3 at the range control valve is
also exhausted via the manual control
valve. This allows spring pressure to
hold the range control valve station-
ary
and retain governor pressure to
line
22.
When road speed drops below
approximately 30 mph, the control
throttle and spring pressures
over-
come the governor pressure and
moves the 1-2 shift valve to the first
gear position. The front servo apply
circuit is exhausted and the rear
servo apply circuit subjected to con-
trol pressure via the 1-2 shift valves.
The transmission will now remain in
1st gear until another drive range is
manually selected.
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