Mercedes-Benz M-Class Operator's Manual page 426

Changing a wheel
424
before raising the vehicle, secure it from
R
rolling away by applying the parking brake
and inserting wheel chocks. Never
disengage the parking brake while the
vehicle is raised.
the jack must be placed on a firm, flat and
R
non-slip surface. On a loose surface, a
large, load-bearing underlay must be used.
On a slippery surface, a non-slip underlay
must be used, e.g. rubber mats.
do not use wooden blocks or similar
R
objects as a jack underlay. Otherwise, the
jack will not be able to achieve its load-
bearing capacity due to the restricted
height.
make sure that the distance between the
R
underside of the tires and the ground does
not exceed 1.2 in (3 cm).
never place your hands and feet under the
R
raised vehicle.
never lie under the raised vehicle.
R
never start the engine when the vehicle is
R
raised.
never open or close a door or the tailgate
R
when the vehicle is raised.
make sure that no persons are present in
R
the vehicle when the vehicle is raised.
Using lug wrench :, loosen the bolts on
X
the wheel you wish to change by about one
full turn. Do not unscrew the bolts
completely.
The jacking points are located just behind the
front wheel housings and just in front of the
rear wheel housings (arrows).
Take the ratchet wrench out of the vehicle
X
tool kit and place it on the hexagon nut of
the jack so that the letters AUF are visible.
Jacking points
;
Jack
=
Crank
?
Position jack = at jacking point ;.
X
The alignment bolt on the jack must be
inserted into the intended jacking point
hole.