Driving Mode; Torque Converter Clutch - Mercedes-Benz Unimog Operating Instructions Manual

the O symbol: briefly pull away and
stop again.
The gear change will be repeated automat-
ically. When the crawler gears are disen-
gaged, the status message without the
O symbol is briefly displayed on the on-
board computer display.
X
Vehicles with Telligent
slowly release the clutch pedal.

Driving mode

Torque converter clutch

General notes
The torque converter clutch allows you to pull
away smoothly and without causing wear,
without using the clutch pedal, in particular
with large trailer loads. The torque converter
clutch is controlled by the transmission con-
trol module. Load your vehicle up to the per-
missible gross weight in order to maximise
tractive power.
If the torque converter lock-up clutch is open,
the X indicator lamp in the status area of
the on-board computer lights up. When it is
closed, the X indicator lamp goes out.
Driving mode
The oil temperature rises during torque con-
verter operation.
Depending on the load and gradient, you can
pull away in 1st - 5th gear. Select the pulling-
away gear according to the load. For loads
exceeding 400 t, you must pull away in 1st
gear. This will prevent the oil in the torque
converter clutch heating up too much.
If the vehicle is stationary and a gear
i
between 6th and 8th is selected, the throt-
tle does not respond.
Depress the brake pedal during gear selec-
tion. If you do not depress the brake pedal, a
warning tone sounds. The
message appears in the on-board computer
display.
®
gearshift:
Depress brake.
The torque converter clutch is opened when
changing gears. If you release the accelerator
pedal slightly, you can determine when the
torque converter lock-up clutch closes. Clos-
ing the torque converter lock-up clutch as
soon as possible has a positive effect on the
oil temperature of the torque converter clutch
and fuel consumption. Waiting for a longer
period before closing the torque converter
lock-up clutch increases fuel consumption
and the oil temperature of the torque con-
verter clutch. Consider your driving style
carefully.
You can temporarily increase the towing
power at engine speeds below 1700 rpm by
using the kickdown function.
G
WARNING
The parking brake may not be sufficient to
secure the vehicle on uphill and downhill gra-
dients. A loaded vehicle or a vehicle with
trailer/semitrailer may roll away. There is a
risk of an accident.
In the control position, check whether the
parking brake alone can hold the entire vehi-
cle. The tractor unit and trailer/semitrailer
should normally be secured using the parking
brake and wheel chocks.
The vehicle can be stopped with any gear
i
engaged.
Driving mode with power take-off
The function of the transmission shift system
is severely restricted with the speed governor
switched on, even in power take-off mode.
For this reason, switch off the speed governor
before changing gears and driving in normal
mode.
X
Stop the vehicle.
X
Leave the engine running at idling speed.
X
Select a gear to pull away.
X
Engage power take-off.
Driving mode
Z
185