Hummer H2. Manual — part 907

Fig. 12: Heat Discoloration
Courtesy of GENERAL MOTORS CORP.

Heat discoloration ranges from faint yellow to dark blue. This discoloration results from overload or an
incorrect lubricant. Excessive heat causes softening of the races or the rollers. In order to check for loss of
temper on the races and the rollers, perform a file test. A file drawn over a tempered part will grab and cut the
metal. A file drawn over a hard part will glide readily with no metal cutting. Replace the bearings if overheating
damage is indicated. The tempered part will fail the file test. Check the seals and the other related parts.

Misalignment

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

Fig. 13: Misalignment
Courtesy of GENERAL MOTORS CORP.

A misaligned outer race due to a foreign object. Clean the related parts. Replace the bearing. Ensure the races
are properly sealed.

Cracked Inner Race

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

Fig. 14: Cracked Inner Race
Courtesy of GENERAL MOTORS CORP.

Cracked race due to improper fit, cocking, or poor bearing seats. Replace the bearing. Correct bearing seats.

Fatigue Spalling

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

Fig. 15: Fatigue Spalling
Courtesy of GENERAL MOTORS CORP.

Flaked surface metal that results from fatigue. Replace the bearing. Clean all related parts.

Brinelling

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2