CHRYSLER SERVICE MANUAL TOROUE-FLITE TRANSMISSION—23
ting off the source of line pressure to the regu-
lator valve secondary reaction area, with the
result that a line pressure of 225 psi., applied
to the primary reaction area, is required to over-
come the force of the regulator valve spring.
b.
Torque Converter Control Valve
This valve maintains an oil pressure of approxi-
mately 30 psi. within the torque converter. Oil
is fed from the regulator valve through a re-
stricting hole in the regulator valve body to
the torque converter. The oil flows through the
torque converter and returns to the regulator
valve body where the converter pressure is
regulated by the torque converter control valve.
When the torque converter pressure rises to 30
psi.,
the control valve will move against the
spring load and allow oil to flow to the cooler
then back to the lubrication circuit. Torque con-
verter pressure acts on the valve's reaction area
such that if it exceeds 60 psi., the valve is moved
further against the spring load, permitting ex-
cess oil from the converter to by-pass into the
oil pan. From the torque converter control
valve, oil is routed through the transmission
lubrication system to lubricate the gear train.
c. Governor Valve
The governor valve assembly transmits a hy-
draulic pressure to the transmission which is
proportional to car speed. This governed pres-
sure,
in conjunction with throttle pressure, con-
trols upshift and downshift speeds. The gover-
nor is so mounted on the output shaft that when
the output shaft rotates, the governor weight
assembly exerts a centrifugal force on the gov-
ernor shaft. The governor shaft transmits this
force to the governor valve. Oil is allowed to
flow from the line pressure port to the governor
pressure port, building up pressure in the gov-
ernor circuit and against the valve reaction
area sufficient to balance the centrifugal force
of the weight.
The greater the vehicle speed, the greater is
the centrifugal force of the weights, and hence
the greater the governor pressure necessary to
balance the centrifugal force. If the vehicle
speed decreases, the decrease in centrifugal
force allows the valve to move out slightly,
venting excess oil and bringing the governor
once more in balance at a lower pressure.
The governor weight assembly is constructed
so that for vehicle speeds under approximately
25 mph., both weights act as a unit, with the
result that small changes in vehicle speed result
in comparatively large changes in centrifugal
force and governor pressure. Above approxi-
mately 25 mph., the primary weight moves
outward against the preload of the spring and
bottoms against the snap ring leaving only the
secondary weight active. Small variations in
vehicle speed above approximately 25 mph.,
therefore, result in only small variations in gov-
ernor pressure.
Governor pressure is routed to the governor
pressure ports of the reverse blocker valve,
shuttle valve, and the 1-2 and 2-3 shift valves
governor plugs.
d. Throttle Valve
The throttle valve assembly transmits a hy-
draulic pressure to the transmission which is
proportional to the amount of throttle opening.
The throttle valve lever shaft is rotated in pro-
portion to the amount of throttle opening of the
carburetor by a linkage connecting the throttle
valve lever shaft to the car's throttle linkage.
The throttle valve lever shaft positions the kick-
down valve and throttle valve spring in accord-
ance with the amount of carburetor throttle
opening, the spring being free (no load) at
closed throttle and compressed at wide open
throttle. Therefore, the throttle valve spring
exerts a force on the throttle valve that in-
creases with carburetor throttle opening.
The throttle valve allows oil to flow from the
line pressure port to the throttle pressure port,
which is connected by a passage to the reaction
area of the throttle valve. Throttle pressure
will build up in the throttle pressure circuit
and against the reaction area until it reaches a
value great enough to balance the force of the
throttle valve spring. If throttle pressure builds
up too high, the throttle valve will move slightly
to a position such that excess oil is allowed to
escape through the vent port.
Throttle pressure will vary with the amount
of carburetor throttle opening from a value of
0 (zero) pressure at closed throttle to a value
of approximately 90 psi. at wide open throttle.
Throttle pressure is routed to the following
places:
(1) Throttle pressure port of the kickdown
valve.
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