For best engine braking, select low while moving. In
low, downshifts are performed at higher rpm than in
drive.
IMPORTANT: If the engine is approaching over-
speed, the UltraShift DM TCU will override the
current gear setting and upshift to prevent en-
gine damage.
If the gear requested is unavailable, a tone will
sound. An unavailable request to downshift is not
stored in memory. The downshift must be requested
again.
When coasting to a stop, the UltraShift DM TCU
does not finish the downshift until the driver presses
down on the throttle pedal again.
IMPORTANT: A downshift request can never
result in a shift into neutral, even if the vehicle is
in the drive position in the lowest possible gear.
Before starting down a hill, slow down. Downshift to
a speed that you can control without hard pressure
on the service brakes.
Before entering a curve, slow down to a safe speed.
Downshift if necessary. This lets you use some
power through the curve to help the vehicle be more
stable on the turn. It also allows you to regain speed
faster as you come out of the curve.
Ultrashift Diagnostics
Clutch Protection Fault
Excessive clutch slippage creates heat and reduces
the life of the clutch. These are some conditions
which lead to clutch abuse:
•
Using the throttle to hold the vehicle on a
grade
•
Starting the vehicle in too high a gear
•
Overloading the vehicle
•
Using high idle with the vehicle in gear
The UltraShift DM TCU is programmed to prevent
clutch abuse. When the clutch overheats, the follow-
ing alerts take place:
•
The "TRANS TEMP" light comes on
•
The current gear indicator displays "CA"
•
A warning tone sounds at one second intervals
The alerts continue until the clutch cools, the throttle
is released, or the clutch is fully engaged.
System Problem
In the event of a problem, do the following steps:
1.
Note the driving conditions at the time the prob-
lem occurred.
2.
Record the status of the transmission at the time
of the problem (AUTO or MAN mode, gear set-
ting R, N, D, or L, current gear, engine speed,
etc.)
3.
Reset the system, using the procedure below.
Reset Procedure
Transmission operation can sometimes be restored
by doing the following reset procedure:
1.
Stop the vehicle when it is safe to do so. Set the
parking brake.
2.
Place the selector switch in neutral and turn off
the ignition.
3.
Check all harness connectors as described in
Chapter 11
.
4.
Wait at least two minutes with the engine shut
down.
5.
Restart the engine.
If the problem continues, contact an authorized
Freightliner or Eaton service facility.
Locked In Gear
If the transmission becomes locked in gear, a dash
(-) will appear on the current gear indicator when the
vehicle is restarted during the reset procedure.
NOTE: If the transmission becomes locked in
gear while the vehicle is moving, increased
braking effort may be required to stop the ve-
hicle.
If the current gear indicator displays a dash during
power-up with the selector switch in neutral, do the
following steps:
1.
Make sure the parking brake is set.
2.
Turn off the ignition and wait at least two min-
utes.
3.
Apply brakes.
Transmissions
8.11
