freightliner M2 Plus 2023 - Allison On-Highway Transmissions

NOTE: If attempting to select a non-Neutral
mode without applying the service brakes, the
transmission will not shift into gear. To shift into
gear, select Neutral, apply the service brakes,
and select the desired mode again.
Low (L)
Use Low when wanting to maximize engine braking
and minimize the use of the brake pedal—for
example, when driving down long grades or when
coming to a stop. To select Low, push down on the
multi-function stalk switch, and hold in the down-shift
position for half a second or more. The lowest
available start gear will be selected (the starting gear
cannot be changed in Low).
If Low is selected while moving, the transmission will
not upshift (unless the system initiates a Low
override). The system will downshift at the earliest
opportunity to provide maximum engine braking.
In the driver display, the low gear is shown as "1."
See
Fig. 14.14.
NOTE: If attempting to select a non-Neutral
mode without applying the service brakes, the
transmission will not shift into gear. To shift into
gear, select Neutral, apply the service brakes,
and select the desired mode again.
Transmission Prognostics
The Allison transmission prognostics display can be
found by navigating to the maintenance screens in
the driver display. The prognostics screen displays
information on the transmission health status (oil filter
status, oil level, and oil life). See
Fig. 14.15.If
transmission health falls below acceptable limits, a
message will be shown on the driver display.
NOTE: For a valid oil level measurement, the
vehicle must be stopped on a level surface with
the transmission in neutral (N).
Allison On-Highway
Transmissions
The Allison on-highway transmissions are fully
automatic and include the 1000 Series
™
, 2000
Series
™
, and 2400 Series
™
. Refer to the Allison
website for additional information,
www.allisontransmission.com.
f61148207/12/2017
1
2
1. Current Gear 2. Selected Gear
Fig. 14.13, Allison Gear Display in Manual Mode
1. Low (displayed as "1")
2. Highest Gear
Available in Low
Fig. 14.14, Allison Gear Display in Low Gear
f611483a10/21/2019
Fig. 14.15, Allison Transmission Prognostics
Automated and Automatic Transmissions
14.15