Hudson 1955 Rambler, Техническое и сервисное руководство

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OVERDRIVE 7
At Speeds Below 30 Miles Per Hour
With the cruising gear control forward at speeds
below 30 miles per hour every switch in the
governor circuit is closed except the governor
switch. But this one open switch is enough to
keep the entire governor circuit and the sole-
noid circuit open, and the solenoid remains
de-energized (Fig. 7).
At Speeds Above 30 Miles Per Hour
As the speed of the car passes 30 miles per
hour, the governor points automatically close.
This completes the governor circuit, energizes
the relay, and closes the relay points "B", thus
energizing the solenoid.
Then, with the momentary release of the
accelerator pedal, engine torque is released
just long enough for the solenoid pawl to move
off the step of the balk ring and engage the
notch of the lock plate locking the sun gear.
This places the car in cruising gear (Fig. 8).
Kickdown Switch
With the car in cruising gear at speeds above 30
miles per hour, depressing the foot accelerator
all the way to the floor places the overdrive in
overtake position (Fig. 9).
With the accelerator pedal in the wide open
position, it contacts the kickdown switch,
opening the points "E" and "K" in the kickdown
switch and closes points "J" and "L". This at
the same time breaks the governor circuit and
completes the kickdown circuit. The break in
the governor circuit de-energizes the sole-
noid. The closing of the kickdown circuit
momentarily "shorts out" the distributor (for
approximately two crankshaft revolutions)
releasing engine torque just long enough for
the solenoid pawl to disengage. The instant
the solenoid disengages, the solenoid points
"D" automatically open, restoring the dis-
tributor circuit. The car then remains in
direct gear as long as the engine is kept
under a pulling load.
DIAGNOSING OVERDRIVE TROUBLES
Since overdrive troubles may originate not
only in the mechanical operation of the unit
but also in the electrical circuit which
controls that unit, the service man should
always check the control system before disas-
sembling the overdrive.
If the trouble is not found after a thorough
inspection of the control system, then the
transmission and overdrive should be removed
for examination.
Unsatisfactory Overdrive Operation. Look for:
Burnt relay fuse in solenoid circuit.
Loose terminals on any of the connecting wires.
FIGURE 8— Above 30 Miles Per Hour, the Governor Points Automatically Close, Thus Closing the
Governor Circuit and the Relay Which Energizes the Solenoid