shift handle body to break torque. The range
shift is automatic.
3.
To skip a gear, press the shift-intent switch into
the shift handle, while in neutral, one time for
every gear that is skipped.
Reverse
1.
Press the system switch on the shift handle so
that it is in the ON position and the ESS system
is activated.
2.
Push the clutch pedal to the bottom of its travel
so that the clutch brake stops the transmission
input shaft from rotating.
3.
Move the shift lever and engage reverse.
4.
Slowly release the clutch pedal and move the
vehicle in the reverse direction.
NOTE: If a HI reverse range is required, follow
the steps below.
5.
Press the system switch on the shift handle so
that it is in the OFF position and the ESS system
is deactivated.
6.
Press the top portion of the shift-intent switch to
engage the HI range.
7.
Push the clutch pedal to the bottom of its travel
so that the clutch brake stops the transmission
input shaft from rotating.
8.
Move the shift lever and engage reverse.
9.
Slowly release the clutch pedal and move the
vehicle in the reverse direction.
See
Fig. 8.32
for two ESS 9-speed shift patterns
and one ESS 10-speed shift pattern.
Allison Automatic
Transmissions
Refer to the Allison website for additional information,
www.allisontransmission.com
.
General Information, Allison
HD-series automatic transmissions have six forward
speeds and one reverse speed. See
Fig. 8.33
.
These transmissions have electronic shift controls
that can be programmed to allow the use of different
numbers of geared speeds. For instance, the trans-
mission 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 programmed to provide another shift configuration
to optimize vehicle use under different operating con-
ditions. To activate a secondary shift mode, or other
special function programmed into the electronic con-
trol unit (ECU), depress the Mode button. "Mode On"
is displayed in the indicator panel just above the
push buttons. 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 HD-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 operate the vehicle. See
Chapter 2
for information on the warning system.
Operation, Allison
CAUTION
The engine should never be operated for more
than 30 seconds at full throttle with the transmis-
sion in gear and the output stalled. Prolonged
operation of this type will overheat the transmis-
sion fluid and will result in severe damage to the
transmission.
1.
Start the engine, then check the digital display
on the "push button shift selector." Under "Se-
lect" at the top of the unit, the display should al-
ways show the "primary" shift mode. Under
"Monitor," the gear the transmission is in should
be displayed.
WARNING
Never shift from neutral (N) to drive (D) or re-
verse (R) at engine speeds above idle. The ve-
hicle will lurch forward or backward, which could
cause property damage and personal injury.
2.
Use reverse (R) to back the vehicle. Completely
stop the vehicle before shifting from a forward
gear to reverse or from reverse to forward. There
is only one reverse gear.
Transmissions
8.35
