Hummer H2. Manual — part 950

Fig. 9: Frettage
Courtesy of GENERAL MOTORS CORP.

Corrosion caused by small relative movement of parts with no lubrication. Replace the bearing. Clean the
related parts. Check the seals. Check for proper lubrication.

Smears

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

Fig. 10: Smears
Courtesy of GENERAL MOTORS CORP.

Smearing of the metal due to slippage. Slippage can be caused by the following factors:

z

Poor fits

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Lubrication

z

Overheating

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Overloads

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Handling damage

Replace the bearings. Clean the related parts. Check for proper fit and lubrication.

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

Stain Discoloration

Fig. 11: Stain Discoloration
Courtesy of GENERAL MOTORS CORP.

Discoloration ranging from light brown to black. This discoloration is caused from incorrect lubrication or
moisture. Reuse the bearing if you can remove the stains with light polishing. Reuse the bearing if there is no
evidence of overheating. Check the seals and the related parts for damage.

Heat Discoloration

2004 Hummer H2

2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2

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