VISION
D R I V E R S H A N D B O O K
94
[WARNING]
Do not allow your vehicle to coast in neutral. This practice can
result in transmission damage. Engine retard 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.
range inhibit Feature
The transmission communicates with the engine to prevent over-rev conditions
which could otherwise result in transmission or engine damage. If one of the range
limiting transmission settings (D, 2 or 1) are selected, the transmission’s range inhibit
feature will take over and allow the transmission to shift to the next range if engine
RPM exceeds certain speeds. Therefore, although the use of a range inhibiting trans-
mission setting to utilize engine braking is an acceptable practice, the Driver must
still control the downhill accelleration with brakes to be prepared for unexpected up-
shifts. When the selected transmission range is being over-ridden, the Range Inhibit
indicator message will appear in the instrument panels message display center.
[CAUTION]
If the transmission will not shift into “D” (drive), or “R” (reverse),
it may be because of an adverse operating condition such as; engine RPM
too high or service brakes not applied when attempting to shift from neutral.
Check for the “RANGE INHIBITED” message or “CHECK TRANS” light. See the
appropriate section of the Allison transmission manual.
Summary of Contents for VISION 2011
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