Mercedes-Benz G 500 Operator's Manual page 391

Practical hints
Flat tire
Wheel wrench
Take the wheel wrench out of the
vehicle tool kit.
On wheel to be changed, loosen but do
not yet remove the wheel bolts
(approximately one full turn with the
wheel wrench).
390
Pump handle (three pieces)
1 Indent for activation of release bolt 2
Take the pump handle out of the
vehicle tool kit.
Assemble the pump handle for the
jack.
Jack
2 Release bolt
Set indent 1 of the pump handle onto
release bolt 2.
Using the pump handle, turn release
bolt 2 clockwise until its stop.
Release bolt 2 is closed.
Remove the pump handle from release
bolt 2.
Set the pump handle into the pump
lever (indicated by the arrow).