Mercedes-Benz G-Class Operator's Manual page 230

Flat tire
228
surfaces, such as tiled floors, you should use
a non-slip underlay, for example a rubber mat.
Do not use wooden blocks or similar objects
to support the jack. Otherwise the jack may
not be able to achieve its load-bearing
capacity if it is not at its full height.
Never start the engine when the vehicle is
raised.
Also observe the notes on the jack.
X
Using lug wrench :, loosen the bolts on
the wheel you wish to change by about one
full turn. Do not unscrew the wheel bolts
completely.
Notch on pump lever
;
X
Assemble the pump lever for the jack. It can
be found with the vehicle tool kit
( Y page 224).
X
Turn pressure release screw = clockwise
as far as it will go using notch ; on the
pump lever.
Pressure release screw = is closed.
i Never turn pressure release screw = by
more than one to two revolutions.
Otherwise, hydraulic fluid could escape.
! The jack is designed exclusively for
jacking up the vehicle at the jacking points.
Otherwise, your vehicle could be damaged.
X
Place the jack on solid ground.
X
Position the jack at the front or rear axle
carrier tubes The jack must always stand
vertically, even on slopes.
Make sure that the jack is placed in the
correct position beneath the axle carrier
tube. The front or rear axle must fit into the
support on the jack.
X
Raise the vehicle by pumping (arrow) until
the tire is a maximum of 1.2 inches (3 cm)
above the ground.