Mercedes-Benz GLK 300 4MATIC 2012 Owner's Manual page 337

Flat tyre
334
The following must be observed when raising
the vehicle:
to raise the vehicle, only use the vehicle-
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specific jack that has been tested and
approved by Mercedes-Benz. If the jack is
used incorrectly, it could tip over while the
vehicle is raised.
the jack is designed only to raise and hold
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the vehicle for a short time while a wheel
is being changed. It is not suited for per-
forming maintenance work under the vehi-
cle.
avoid changing the wheel on uphill and
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downhill slopes.
before raising the vehicle, secure it from
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rolling away by applying the parking brake
and inserting wheel chocks. Never disen-
gage the parking brake while the vehicle is
raised.
the jack must be placed on a firm, flat and
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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
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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
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underside of the tyres and the ground does
not exceed 3 cm.
never place your hands or feet under the
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raised vehicle.
never lie under the raised vehicle.
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never start the engine when the vehicle is
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raised.
never open or close a door or the tailgate
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when the vehicle is raised.
make sure that no persons are present in
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the vehicle when the vehicle is raised.
Using wheel wrench :, loosen the bolts on
X
the wheel you wish to change by about one
full turn. Do not unscrew the bolts com-
pletely.
The jacking points are located just behind the
front wheel arches and just in front of the rear
wheel arches (arrows).
Take the ratchet ring spanner out of the
X
vehicle tool kit and place it on the hexagon
nut of the jack so that the letters AUF are
visible.