Tiffin Motorhomes PowerGlide 2019, Owner'S Manual

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A L L I S O N T R A N S M I S S I O N O P E R A T I O N
2-3
zone or if the temperature warning light on the gauge panel should come on, reduce your road speed, shift to
the next lower gear and keep your tachometer within
500 RPM of engine governed speed. In many cases this
will stabilize the water temperature. If the temperature gauge continues to rise, pull to the side of the road and
shift the transmission into neutral. Bring the engine
RPM to 1,700—2,000 RPM until the temperature drops
down into the normal range. This should occur in a relatively short period of time. If the temperature gauge does
not begin to drop, stays in the red zone, or continues to rise, shut down the engine and allow it to cool. After the
engine is allowed to cool check the fluid level in the reservoir and add coolant if needed.
A good “ rule of thumb ” for descending grades is to never use a higher gear than was used to climb the same
or similar grade. Try to keep the engine within 500 RPM of governed speed. This will give the best engine
braking and reduce the need to use the service brakes. Select a gear that will keep you at a safe speed with
minimal brake application. Never ride your brakes when descending a grade since excessive brake heat will
build up and your brakes could fade, leaving you with little or no braking power.
Your vehicle is equipped with an engine brake. The engine brake will assist in slowing your vehicle on a
downhill grade. With the engine brake switch in the
ON position, release the accelerator and depress the
service brake to activate the engine brake. When the engine brake is activated the transmission will pre-select a
lower gear to aid in braking. This is indicated by a “2” in the left hand pane of the transmission shift selector.
The transmission will begin to down-shift as soon as the road and engine speed will safely allow. This will
produce a slowing effect and will remain engaged until either the exhaust brake switch is
turned off , the
accelerator is pressed , or the engine speed drops to 800 RPM. If your initial speed is high, you may have to
step on the brake to slow the vehicle before the transmission will down-shift from 6
th
gear to 5
th
gear . This is
normal.
Always select ( N ) neutral on the transmission shift pad prior to turning off the vehicle engine.
Fluid Level Check
Use the transmission shift pad for best results in checking the transmission fluid level. The transmission will
not reach operating temperature until the coach has been driven for at least 15 miles. Therefore, it may be best
to check transmission fluid level at the end of your driving day.
Transmissions do not consume fluid. If your transmission shows to be low of fluid, it should be inspected for
leaks.