differential MERCEDES-BENZ GL SUV 2009 User Guide

X
Wheels and tyres: check the tyre tread
depth and tyre pressure.
X Check for damage and remove foreign
objects, e.g. small stones, from the
wheels/tyres.
X Replace any missing valve caps.
X Replace dented or damaged wheels.
Checklist after driving off-road Driving over rough terrain places greater
demands on your vehicle than driving on nor-
mal roads. After driving off-road, check the
vehicle. This allows you to detect damage
promptly and reduce the risk of an accident
to yourself and other road users.
X Deactivate the LOW RANGE off-road gear
(Y page 114).
X Deactivate DSR (Y page 113).
X Set the differential lock setting to AUTO on
the selector wheel (Y page 116).
X Lower the vehicle level again to a level suit-
able to the road conditions, e.g. to the high-
way/high-speed level.
X Clean the headlamps and rear lights and
check for damage.
X Clean the front and rear licence plates.
X Clean the wheels/tyres with a water jet and
remove any foreign objects.
X Clean the wheels, wheel arches and the
vehicle underside with a water jet; check
for foreign objects and damage.
X Check whether twigs or other parts of
plants have become trapped. These
increase the risk of fire and can damage
fuel pipes, brake hoses or the rubber bel-
lows of the axle joints and propeller shafts.
X After the trip, examine without fail the
entire undercarriage, wheels, tyres, brakes,
bodywork structure, steering, chassis and
exhaust system for damage.
X After driving for extended periods across
sand, mud, gravel, water or in similarly dirty
conditions, have the brake discs, wheels, brake pads/l
inings and axle joints checked
and cleaned.
X If you detect strong vibrations after off-road
travel, check for foreign objects in the
wheels and drive train and remove them if
necessary. Foreign objects can disturb the
balance and cause vibrations. Travelling uphill
Approach/departure angle The table shows approach and departure
angles
:and ;when the vehicle is loaded
and ready to drive. :
: ;
; Vehicle level
Off-road level 3 32° 27°
Off-road level 2 31° 26°
Off-road level 1 28° 23°
Highway level 26° 21°
R
Follow the line of fall when driving on slopes
and steep gradients.
R Before driving on extreme uphill and down-
hill gradients, select the LOW RANGE off-
road gear.
R Observe the warnings for off-road driving
(Y page 188).
R Drive slowly. 190
Off-road drivingOperation
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Display messages
Possible causes/consequences and
X
X Solutions ° Malfunc‐
tion The level control has malfunctioned.
X
Drive as appropriate for the current vehicle level, but do not
exceed 80 km/h.
X Make sure that there is sufficient ground clearance.
X Have the vehicle checked at a qualified specialist work-
shop. ° Rising
20 km/h max. The vehicle is being adjusted to off-road level 3. The display
message indicates the maximum speed allowed for off-road
level 3.
X
Do not exceed a maximum speed of 20 km/h. ° 20 km/h max. You are driving in off-road level 3. The display message indi-
cates the maximum speed allowed for off-road level 3.
X
Do not exceed a maximum speed of 20 km/h. Æ being low‐
ered
20 km/h max. The vehicle is being lowered from off-road level 3 to off-road
level 2. The display message indicates the maximum speed
allowed for off-road level 3.
X
Do not drive faster than 20 km/h until the vehicle has
reached off-road level 2. Æ Bring
speed
below
20 km/h
G
Risk of accident
You are exceeding the speed permissible for the selected off-
road level.
X Do not exceed a maximum speed of 20 km/h.
X Adjust your driving style to the altered handling character-
istics.
X Only make slight steering movements and avoid fast steer-
ing movements.
X Be aware of the altered handling characteristics. 8 Locking
system
inopera‐
tive Con‐
sult work‐
shop The differential locks are faulty.
X
Do not exceed a maximum speed of 80 km/h.
X Have the vehicle checked at a qualified specialist work-
shop. 222
Display
messagesPractical advice
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Display messages
Possible causes/consequences and
X
X Solutions 8 Diff.
lock sys‐
tem over‐
heated.
Wait
briefly. The differential locks are too hot and have been disengaged.
X
Drive on carefully.
X Allow the differential locks to cool down.
The differential locks reengage as soon as they have cooled
down. Ã inopera‐
tive DSR is deactivated due to a malfunction.
X
Have DSR checked at a qualified specialist workshop. 8 Stop vehi‐
cle Apply
parking
brake A gearshift process has been cancelled. LOW RANGE is in the
neutral position. There is no connection between the engine
and the drive wheels.
X
Pull over and stop the vehicle safely, paying attention to
road and traffic conditions.
X Depress the parking brake firmly. Do not continue driving
under any circumstances.
X Repeat the shift process. Å Consult
workshop
If
parked,
apply pk.
brake The LOW RANGE system is malfunctioning.
X
Do not exceed a maximum speed of 80 km/h.
X Firmly depress the parking brake to park.
X Have the vehicle checked at a qualified specialist work-
shop. Å max.
speed
70 km/h You have exceeded the maximum speed for the gearshift
process.
X
Drive more slowly.
The gearshift process is carried out. Å max.
speed
40 km/h You have exceeded the maximum speed for the gearshift
process.
X
Drive more slowly.
The gearshift process is carried out. Å Engage N
briefly You have reduced the vehicle speed, but the automatic trans-
mission is not in the
Nposition.
X Briefly shift the automatic transmission to position N.Å Shifting
process
cancelled
Reactivate The gearshift process has been cancelled.
X
Repeat the shift process. Display
messages
223Practical advice
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