Mercedes-Benz GLA Operator's Manual page 352

Changing a wheel
350
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, flat, 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 tires and the ground does
not exceed 1.2 in (3 cm).
Never place your hands and feet under the
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raised vehicle.
Do not lie under the vehicle.
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Do not 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 lug wrench :, loosen the bolts on
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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
wheel housings of the front wheels and just in
front of the wheel housings of the rear wheels
(arrows).
Take the ratchet wrench out of the tire-
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changing tool kit and place it on the hexa-
gon nut of the jack so that the letters AUF
are visible.
Position jack = at jacking point ;.
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Example