Mercedes-Benz GL-Class 2009 Owner's Manual page 198

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The key remains inserted when you
remove the ball coupling.
Pull handwheel ? away from the ball cou-
X
pling in the direction of the arrow and turn
it clockwise until it engages.
The white dot on the ball coupling is aligned
with the red area on the handwheel.
Insert the ball coupling vertically up into
X
ball coupling recess = in the direction of
the arrow until it engages.
Handwheel ? turns automatically, aligning
X
green area A on handwheel ? with white
dot B on the ball coupling.
Turn key : to the stop in the direction of
X
the arrow (lock).
Remove key :.
X
Press protective cap ; onto the lock.
X
G
Risk of accident
The ball coupling is only securely mounted
when the green area on the handwheel is
aligned with the white dot on the ball coupling
* optional
Version: 2.11.8.1
and the key can be removed. If the ball cou-
pling is not securely mounted, it may come
loose.
The ball coupling must be locked and the key
must be removed when towing a trailer. This
is the only way to guarantee that the ball cou-
pling is secured and cannot come loose while
the vehicle is in motion. If the ball coupling
cannot be locked and the key cannot be
removed, remove the ball coupling and clean
it.
If the ball coupling can still not be fitted
(locked) after it has been cleaned, remove the
ball coupling. The trailer tow hitch must then
not be used to tow a trailer, as safe operation
is not guaranteed.
Have the entire trailer coupling checked at a
qualified specialist workshop. Mercedes-
Benz recommends that you use a Mercedes-
Benz Service Centre for this purpose. In par-
ticular, work relevant to safety or on safety-
related systems must be carried out at a quali-
fied specialist workshop.
Socket
:
Coupling up and uncoupling a trailer
Coupling up a trailer
G
Risk of injury
Never lock, unlock, open or close a vehicle
door or tailgate when coupling up or decou-
pling a trailer. The vehicle level could change
and you could endanger yourself or others.
Trailer towing*
Z
195