Hudson 481 Series Owner's Manual page 53

48
To check fluid level, first remove Overdrive filler plug and determine level, which should
be even with lower edge of hole. If level is low, refill to correct level. Then check oil level
in transmission and refill as required.
To drain and refill, first be sure lubricant is warm as it will flow more freely. Remove
both drain plugs and drain all old lubricant. Replace plugs. Refill Overdrive first, permitting
level to come up to bottom of filler plug hole. Next refill transmission to bottom of level of
the filler plug hole. Replace both plugs.
Should it be necessary to thin the lubricant to facilitate shifting in extremely cold
1
weather, drain out 2 /2 ounces of lubricant, add 21/
proper level with oil.
TRANSMISSION OVERDRIVE
Transmission Overdrive is available on all models as a factory installed option only. It is
not available for field installation. This unit provides fourth speed operation at approxi-
mately 22 miles per hour and also permits free wheeling on deceleration below about 19
miles per hour. It reduces engine speed 28 per cent in relation to car speed and contributes
to smoother operation and greater gasoline and oil economy at high speeds.
The speeds at which overdrive becomes operative on acceleration and when free wheel-
ing becomes effective on deceleration are controlled by a centrifugal governor switch
mounted on the Overdrive housing. Engagement and disengagement of Overdrive is con-
trolled through the accelerator pedal when the Overdrive control knob, located on the
instrument panel, is pushed out. Conventional operation is obtained when the knob is pulled
out.
Push the control knob all the way in for operation in Overdrive. This may be done with
the car standing or at any ordinary driving speed. Overdrive becomes operative at speeds
above approximately 22 miles per hour and the shift is made by removing the foot from the
accelerator momentarily. Upon again depressing the accelerator, the car will operate in
Overdrive and continue to do so until the speed drops to about 19 miles per hour. Overdrive
will then automatically disengage, reverting to direct drive through free wheeling.
As operation in Overdrive does not provide best acceleration for passing other cars or
give the necessary power to climb steep grades, it is occasionally necessary to revert
temporarily to direct drive at speeds higher than 19 miles per hour. This can be accom-
plished by depressing the accelerator pedal fully beyond the wide open throttle position.
To re-engage Overdrive, momentarily release the accelerator pedal (at speeds above 22
miles per hour) and resume normal operation in Overdrive.
When Overdrive and free wheeling is not desired, as in heavy traffic, on icy and slippery
pavements or on steep grades, simply pull the control knob out while the car is standing or
moving at less than 19 miles per hour.
HUDSON OWNER MANUAL
ounces of kerosene and then refill to
2
(Optional Equipment)
OPERATION