Bearings fail for many reasons

Before lubricating a bearing, make sure the grease fitting is clean so contamination is not introduced.

Scratching, gouging, and general wear in the bore of an inner ring and on the outside diameter of a shaft are indications of loss of lock.

Surface smearing, peeling, and skidding are forms of adhesive wear that occurs when operating with insufficient oil film thickness.

Surface smearing, peeling, and skidding are forms of adhesive wear that occurs when operating with insufficient oil film thickness. Under these conditions, sliding occurs between the rolling elements and raceways, causing surface deformation, cold welding and/or material transfer.

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