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Allison Transmission Emergency Vehicle Series

Allison Transmission Emergency Vehicle Series
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PUSHBUTTON AND LEVER SHIFT SELECTORS
WITH DIGITAL DISPLAY
(cont’d)
Description of Available Ranges (refer to Figure 11 and Figure 12)
7
+
6*
5*
4*
3
2
Lower ranges provide greater engine braking for going down
grades (the lower the range, the greater the braking effect).
Occasionally, it may be desirable to restrict automatic shifting to a
lower range because of:
Road conditions.
Load.
Traffic conditions.
Etc.
The pushbutton shift selector arrow buttons access individual
forward ranges. Push the (Up) or (Down) arrow for the desired
range. The digital display shows the range chosen. Even though a
lower range is selected, the transmission may not downshift until
vehicle speed is reduced (this prevents excessive engine speed in
the lower range).
1 First-range provides the vehicle with its maximum driving torque
and engine braking effect. Use rst-range when:
Pulling through mud and deep snow.
Maneuvering in tight spaces.
Driving up or down steep grades.
For vehicles equipped with the pushbutton selector, push the
(Down) arrow until rst-range appears in the select window.
+ Only available in 4700/4800 EVS.
* Actual ranges available depend on programming by vehicle manufacturer.
30

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