same gear, disengage the clutch and move the shift
lever to the next lower gear. Engage the clutch
smoothly.
Continue downshifting, as conditions require, using
the same sequence described above.
IMPORTANT: Do not rest your foot on the clutch
pedal while driving. This causes partial clutch dis-
engagement, which could cause premature clutch
wear.
NOTE: With synchronized models, disengage the
clutch completely when shifting gears. Double
clutching is unnecessary. If the vehicle is moving
when shifting, depress the clutch pedal just far
enough to disengage the clutch.
Allison Automatic
Transmissions
General Information
MD-series (MD-CR and MD-WR) automatic transmis-
sions have six forward speeds and one reverse speed.
See Fig. 5.3. These transmissions have electronic shift
controls that can be programmed to allow the use of
different numbers of geared speeds. For instance, the
transmission can be programmed to operate as a
4-speed, 5-speed, or 6-speed unit in the "primary" shift
mode. If needed, a "secondary" shift mode can be pro-
grammed to provide another shift configuration to opti-
mize vehicle use under different operating conditions.
To activate a secondary shift mode, or other special
function programmed into the electronic control unit
(ECU), depress the MODE button. "Mode On" is dis-
played in the indicator panel just above the push but-
tons. A label just above the MODE button identifies the
special function.
NOTE: Each time a push button is depressed on
the shift selector, a short beep will be heard. This
indicates that the ECU has received input to
change operation.
The MD-series transmission system is designed to warn
the driver of transmission malfunctions. The driver of a
vehicle equipped with these transmissions should know
the extent of the warning system in order to safely oper-
ate the vehicle. See Chapter 3 for information on the
warning system.
Operation
CAUTION
The engine should never be operated for more than
30 seconds at full throttle with the transmission in
gear and the output stalled. Prolonged operation of
Transmissions
5.2
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