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Allison Model 3000 Series Transmission Gear Selection
[WARNING] When leaving the vehicle while the engine is running, the opera-
tor must ensure the transmission is in "Neutral", the parking brake is engaged,
and the wheels are chocked. The vehicle may move unexpectedly without
these precautions.
R—Reverse. The vehicle must be completely stopped before shifting from for-
ward to reverse or from reverse to forward. The select indicator and the monitor will
display "R" when the vehicle is in reverse.
N—Neutral. Use neutral to start the engine, to check vehicle accessories, and
for extended periods of engine idle operation. Under normal operation, the trans-
mission is directed by the ECU to neutral during the startup procedure. This occurs
automatically with the push-button selector. If the vehicle starts in any range except
neutral, seek service immediately.
[WARNING] Do not allow your vehicle to coast in neutral. This practice can
result in transmission damage. Engine retarding and braking assistance is not
available when the transmission is in neutral. It may not be possible to get the
transmission back into gear while the bus is moving.
D—Drive. When "D" is selected, the vehicle will start to move in first gear and
the transmission will upshift automatically through each gear as the speed increases.
As the vehicle slows down, the transmission will downshift automatically. The select
indicator will display the highest gear available and the monitor will display the cur-
rent operating gear.
2, 3, 4, 5 Gears. Occasionally, the road conditions, load, or traffic conditions will
make it desirable to restrict the automatic shifting to a lower gear. Positions "5", "4",
"3", and "2" provide progressively greater engine braking for going down grades (the
lower the gear, the greater the braking effect). Push the "Up" or "Down" arrow to the
desired gear. The select indicator will display your choice and the monitor will display
the gear the bus is operating in.
1 Gear. Use position "1" gear when pulling through mud and deep snow, when
maneuvering in tight spaces, or while driving up or down grades. Low gear provides
the vehicle maximum power and maximum engine braking power.
The transmission incorporates a hold feature to prohibit upshifting beyond the
gear selected during normal driving. For downhill operation, however, the transmis-
sion may upshift beyond the selected gear when the engine's governed speed is ex-
ceeded, and damage to the engine is possible.
ROUTINE OPERATION
81
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