Hummer H3. Manual — part 942

Fig. 4: Identifying Galling
Courtesy of GENERAL MOTORS CORP.

Metal smears on the roller ends can be due to overheating, lubricant failure or lubricant overload.
Replace the bearing. Inspect the seals. Inspect for proper lubrication.

Etching

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Fig. 5: Identifying Etching
Courtesy of GENERAL MOTORS CORP.

Bearing surfaces appear gray or grayish black in color, with related etching away of material
usually at roller spacing. Replace the bearings. Inspect the seals. Inspect for proper lubrication.

Bent Cage

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Fig. 6: Identifying Bent Roller Cage
Courtesy of GENERAL MOTORS CORP.

A damaged cage can be due to improper handling or improper tool usage. Replace the bearing.

Cage Wear

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Fig. 7: Identifying Cage Wear
Courtesy of GENERAL MOTORS CORP.

Wear around the outside diameter of the cage and the roller pockets can be caused by abrasive
material. Wear can be caused from inefficient lubrication. Clean the related parts and the
housings. Inspect the seals. Replace the bearings.

Indentations

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3