Mercedes-Benz M-Class 2012 Owners Manual - Manual (Page 216)

Installing the ball coupling
G WARNING
If the vehicle/trailer combination is not
secured, the trailer may come loose. As a
result, you could cause an accident.
Therefore, make sure that the ball coupling is
secured with the bolt supplied and the
corresponding spring cotter.
G WARNING
The ball coupling can be damaged if the nut is
tightened on the ball coupling with the
incorrect torque. This could cause the trailer
to detach while driving and an accident could
occur as a result.
Therefore, please observe the following:
R do not exceed the maximum permitted
noseweight of the ball coupling, the trailer
coupling and the trailer tow hitch.
R when installing, always use a retaining ring
between the nut and the mounting surface
of the ball coupling carrier.
R if the assembled ball coupling has been
permanently mounted on the vehicle, have
the ball coupling regularly checked for
correct installation and torque at a qualified
specialist workshop.
R check that the thread under the nut is of
the correct length.
The detachable ball coupling is located in the
stowage well under the cargo compartment
floor (
Y
page 292).
X
Open the cargo compartment floor
(
Y
page 292).
Ball coupling and ball coupling stowage well
(example)
X
Remove ball coupling : with the bolt and
spring cotter from ball coupling stowage
well ;.
Protective cap
X Pull protective cap = in the direction of the
arrow, out of the ball coupling recess.
X
Place protective cap = into the ball
coupling stowage well.
Ball coupling recess
214
Trailer towing
Driving
and
parking