Allison Transmission Motorhome Series Operator's Manual page 24

PUSHBUTTON AND LEVER SHIFT SELECTORS
Description of Available Ranges (refer to Figure 7 and Figure 8)
R Completely stop the vehicle and let the engine return to idle before
shifting from a forward range to R (Reverse) or from R (Reverse)
to a forward range. The digital display will display "R" when
R (Reverse) is selected.
WARNING: When starting the engine, make sure the service
brakes are applied. Failure to apply the service brakes can
result in unexpected vehicle movement.
WARNING: Vehicle service brakes, parking brake, or
emergency brake must be applied whenever N (Neutral) is
selected to prevent unexpected vehicle movement. Selecting
N (Neutral) does not apply vehicle brakes, unless an auxiliary
system to apply the parking brake is installed (see the
Operator's Manual for the vehicle).
WARNING: If you let the vehicle coast in N (Neutral), there is
no engine braking and you could lose control. Coasting can also
cause severe transmission damage. To help avoid injury and
property damage, do not allow the vehicle to coast in
N (Neutral).
N Use N (Neutral) when starting the engine, to check vehicle
accessories, and for extended periods of engine idle operation
(longer than five minutes). For vehicles equipped with the
pushbutton selector, N (Neutral) is selected by the ECU during
start-up. For vehicles equipped with the lever selector, the vehicle
will not start unless N (Neutral) has been selected. If the vehicle
starts in any range other than N (Neutral), seek service
immediately. N (Neutral) is also used during stationary operation of
the power takeoff (if the vehicle is equipped with a PTO). The
digital display will show "N" when N (Neutral) is selected. Always
select N (Neutral) before turning off the vehicle engine.
WITH DIGITAL DISPLAY (cont'd)
23