freightliner 108SD, Руководство пользователя

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shift points will be offset by 200 rpm. The efficiency
of the exhaust brake will be maximized.
Low (L) is located at the lower end of the four-
position gear selector switch on the SmartShift con-
trol lever. To select L, press the neutral lock button
and move the gear selector switch to the position
below D.
Allison Automatic
Transmissions
Refer to the Allison website for additional information,
www.allisontransmission.com .
General Information, Allison
Transmissions
HD-series automatic transmissions have six forward
speeds and one reverse speed. These transmissions
have electronic shift controls that can be pro-
grammed 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 programmed to pro-
vide another shift configuration to optimize vehicle
use under different operating conditions. To activate
a secondary shift mode, or other special functions
programmed into the electronic control unit (ECU),
depress the Mode button. See
Fig. 14.7 . "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.
Operation Tips, Allison Transmissions
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.
NOTICE
The engine should never be operated for more
than thirty seconds at full throttle with the trans-
mission 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.
NOTICE
Do not allow the vehicle to coast in neutral. This
can result in severe transmission damage. Also,
no engine braking is available.
The following tips highlight important operation prin-
ciples.
•
Start the engine, then check the digital display
on the shift selector. Under "Select" at the top
of the unit, the display should always show the
"primary" shift mode. Under "Monitor," the cur-
rent gear should be displayed.
•
Use reverse (R) to back the vehicle. Com-
pletely stop the vehicle before shifting from a
forward gear to reverse, or from reverse to for-
ward. There is only one reverse gear.
10/31/94 f600369a
1
2
1. Indicator Panel 2. Mode ID
Fig. 14.7, Allison Push Button Shift Selector
Automated and Automatic Transmissions
14.13