Hummer 2004 H2 Owner's Manual page 400

CAUTION:
{
Raising your vehicle with the jack improperly
positioned can damage the vehicle and even
make the vehicle fall. To help avoid personal
injury and vehicle damage, be sure to fit the
jack lift head into the proper location before
raising the vehicle.
6. Turn the ratchet clockwise to raise the vehicle.
Raise the vehicle far enough off the ground so
there is enough room for the spare tire to clear the
ground.
5-86
7. Remove all the wheel
nuts and take off the
flat tire.