2010 Hummer H3 Owner's Manual - Page 337

Vehicle Care 10-71 { WARNING Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack. { WARNING Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after time. The wheel could come off and cause an accident. When changing a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. See If a Tire Goes Flat on page 10‑64. 8. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. { WARNING Rear Tire Flat: Use the jack handle and both jack handle extensions. Attach the wheel wrench to the jack extensions. Attach the jack handle to the jack. From the rear of the vehicle align the jack under the rear axle. Turn the wheel wrench 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. 6. Turn the wheel wrench clockwise to raise the jack head to the lifting point. 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. 7. Remove all the wheel nuts and take off the flat tire.