Mack M359, Manual

Page: 165 / 332

STARTING AND DRIVING
ALLISON TRANSMISSION
List of Warnings
WARNING
Using the retarder on wet or slippery
roads may cause loss of traction on the
drive wheels—your vehicle may slide out
of control. To help avoid injury or property
damage, turn the retarder enable to OFF
when driving on wet or slippery roads.
WARNING
To help avoid injury or property damage
caused by sudden movement of the
vehicle, do not make shifts from N
(Neutral) to D (Drive) or R (Reverse) when
the throttle is open. The vehicle may lurch
forward or rearward and the transmission
can be damaged. Avoid this condition by
making shifts from N (Neutral) to a forward
range or R (Reverse) only when the
throttle is closed and the service brakes
are applied.
DANGER
To help avoid unexpected vehicle
movement that might cause death,
serious injury, or property damage, always
have your foot on the brake, the throttle
released, and the engine at idle before
making a N (Neutral) to D (Drive)
;
N
(Neutral) to R (Reverse)
;
D (Drive) to R
(Reverse)
;
or R (Reverse) to D (Drive)
selection.
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).
CAUTION
When starting the engine, make sure the
service brakes are applied. Failure to
apply the service brakes can result in
unexpected vehicle movement.
NOTE
D (Drive) may not be attained due to an
active inhibitor. Always apply the service
brakes when selecting D (Drive) to prevent
unexpected vehicle movement and
because a service inhibit may be present.
When the selected range is flashing, it
indicates the shift to D (Drive) is inhibited.
Determine if diagnostic codes are active if
D (Drive) is not attained.
NOTE
R (Reverse) may not be attained due to an
active inhibitor. Always apply the service
brakes when selecting R (Reverse) to
prevent unexpected vehicle movement
and because a service brake inhibit may
be present. When R is flashing, it indicates
the shift to R (Reverse) is inhibited.
Determine if diagnostic codes are active if
R (Reverse) is not attained.
DANGER
To avoid loss of control, use a
combination of downshifting, braking, and
other retarding devices. Downshifting to a
lower transmission range increases engine
braking and can help you maintain control.
The transmission has a feature to prevent
automatic upshifting above the lower
range selected. However, during downhill
operation, if engine governed speed is
exceeded in the lower range, the
transmission will upshift to the next higher
range to prevent engine damage. This will
reduce engine braking and could cause a
loss of control. Apply the vehicle brakes or
other retarding device to prevent
exceeding engine governed speed in the
lower range selected.
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