Allison On-Highway
Transmissions
The Allison on-highway transmissions are fully auto-
matic and include the 1000 Series
™
, 2000 Series
™
,
and 2400 Series
™
. Refer to the Allison website for
additional information,
www.allisontransmission-
.com
.
Safety Precautions
WARNING
Do not leave the vehicle unattended with the en-
gine running. If you leave the vehicle and the en-
gine is running, the vehicle can move suddenly,
which could result in personal injury or property
damage.
1000 Series
On vehicles with Allison 1000 series transmissions,
do the following steps if you have to leave the cab
with the engine running (for example, when checking
the transmission fluid):
Without Park Position
1.
Bring the vehicle to a complete stop using the
service brake.
2.
Ensure that the engine is at low idle rpm.
3.
Put the transmission in neutral.
4.
Apply the parking brake, and make sure it is
properly engaged.
5.
Chock the rear tires and take any other steps
necessary to keep the vehicle from moving.
With Park Position
1.
Bring the vehicle to a complete stop using the
service brake.
2.
Ensure that the engine is at low idle rpm.
3.
Put the transmission in P (park).
4.
Apply the parking brake (if equipped), and make
sure it is properly engaged.
5.
Engage the park range by slowly releasing the
service brake.
6.
Chock the rear tires and take any other steps
necessary to keep the vehicle from moving.
2000 Series
On vehicles with Allison 2000 series transmissions,
do the following steps if you have to leave the cab
with the engine running (for example, when checking
the transmission fluid):
Without Auto-Apply Parking Brake
Follow the instructions for vehicles with 1000 series
transmissions, under the heading "Without Park Posi-
tion."
With Auto-Apply Parking Brake
1.
Bring the vehicle to a complete stop using the
service brake.
2.
Ensure that the engine is at low idle rpm.
3.
Put the transmission in PB (auto-apply parking
brake).
4.
Apply the parking brake (if equipped), and make
sure it is properly engaged.
5.
Chock the rear tires and take any other steps
necessary to keep the vehicle from moving.
2400 Series
On vehicles with 2400 series transmissions, follow
the instructions for vehicles with 1000 series trans-
missions.
Range Inhibit Indicator, 2000 and
2400 Series
A RANGE INHIBIT indicator is a standard feature of
the 2000 series and 2400 series transmissions. The
RANGE INHIBIT indicator comes on to alert the
driver that transmission operation is being inhibited
and that the range shifts being requested by the
driver may not occur. When certain operating condi-
tions are detected by the TCM (transmission control
module), the controls will lock the transmission in the
current operating range.
Shift inhibits occur under the following conditions:
•
Shifts from neutral to reverse or from neutral to
a forward range when the engine is above idle,
greater than 900 rpm.
Drivetrain
8.3