Engaging - Mercedes-Benz Unimog Operating Instructions Manual

Driving mode
190
Differential lock
Important safety notes
Engage the differential lock when required,
e.g. when driving off-road or on slippery road
surfaces.
The differential locks can also be engaged/
disengaged while driving, without disengag-
ing the clutch, but only if the wheels are not
spinning.
G
WARNING
If you activate the automatic operating mode
while driving off-road or with the differential
lock engaged, the electronic management
system may perform unwanted gear changes.
Due to the interruption in the tractive power,
the vehicle can roll backwards on uphill
slopes, for instance. There is a risk of an acci-
dent.
Always activate the manual operating mode
when driving off-road or with the differential
lock engaged.
G
WARNING
If you engage the differential locks when driv-
ing on a firm, high-traction surface, the steer-
ability of the vehicle is severely impaired. You
could lose control of the vehicle, especially
when activating on a bend. There is a risk of an
accident.
Disengage the differential locks immediately
on a firm, high-traction surface.
Vehicles with Telligent
shift: in particularly difficult driving condi-
tions, switch to manual driving program M.
This will enable you to avoid any undesired
interruptions to the tractive power that may
occur with automatic gearshifting. In difficult
terrain you must manually engage and
release the clutch pedal. In order to do this,
the clutch pedal must be folded out
( Y page 181).
®
automatic gear-
Engaging the differential lock
The individual differential locks can only be
engaged in sequence.
X
Turn the differential lock switch to position
1.
The transfer case inter-axle lock is
engaged. A symbol appears in the on-board
computer to indicate locking and the i
indicator lamp lights up in the instrument
cluster.
X
Turn the differential lock switch to position
2.
The rear-axle differential lock is also
engaged. A symbol appears in the on-board
computer to indicate locking and the i
indicator lamp lights up in the instrument
cluster.
X
Turn the differential lock switch to position
3.
The front-axle differential lock is also
engaged. ABS is deactivated. A symbol
appears in the on-board computer to indi-
cate locking and the i indicator lamp
lights up in the instrument cluster.
Disengaging the differential lock
X
Turn the differential lock switch to position
g.
The differential locks are disengaged. The
differential lock indicator in the on-board
computer display and the i indicator
lamp go out. ABS is reactivated.