Tapered Roller Bearing Diagnosis: Smears

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Fig 1: Identifying Smears

Courtesy of GENERAL MOTORS CORP.

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

Poor fits
Lubrication
Overheating
Overloads
Handling damage

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