6. From a Stop, release vehicle brakes and perform a set of Wide Open
Throttle Upshifts to the highest attainable range for the vehicle. Release
the throttle to Closed and Preselect Down to 1st Range using the shift
selector. Use light vehicle brakes to decelerate to a stop.
7. If the vehicle is equipped with a retarder or engine brake, turn that system
on for this segment. From a Stop, release vehicle brakes and perform a set
of Wide Open Throttle Upshifts to the highest attainable range for the
vehicle. Release the throttle to Closed and, using light vehicle brakes and
the retarder or engine brake, decelerate vehicle to a stop.
NOTE:
Allison Transmission does not recommend using the vehicle
brakes to “force” Powered Downshifts (PD, downshifts with the throttle
applied). If grades are available, these should be used to adapt in WOT
and PT Powered Downshifts.
8. Approach the grade in the highest safely attainable range and hold the
throttle steady at WOT and allow the vehicle to perform the Powered
Downshifts as required to ascend the grade.
9. Approach the grade in the highest safely attainable range and hold the
throttle steady at Part Throttle (PT—50 to 60 percent) and allow the
vehicle to perform the Powered Downshifts as required to ascend the
grade.
RANGE PRESELECTION
NOTE:
Preselecting during normal operation may result in reduced fuel
economy.
Range preselection means selecting a lower range to match driving conditions
encountered or expect to be encountered. Learning to take advantage of
preselected shifts will give you better control on slick or icy roads and on
downgrades.
Downshifting to a lower range increases engine braking. The selection of a lower
range often prevents cycling between that range and the next higher range on a
series of short up-and-down hills.
COLD WEATHER STARTS
All Motorhome Series transmissions are programmed to restrict full operation until
speci
fi
c
fl
uid temperatures are reached. Refer to the following table for
temperature restrictions.
34
