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Damage Condition	Possible Causes	Countermeasures
Wear is surface deterioration due to sliding friction at the surface of the raceway, rolling elements, roller end faces, rib face, cage pockets, etc.	Entry of debris Progression from rust and electrical corrosion Poor lubrication Sliding due to irregular motion of rolling elements	Improve the sealing mechanism Clean the housing Filter the lubrication oil thoroughly Check the lubricant and lubrication method Prevent misalignment

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Part : Inner ring of a cylindrical roller bearing

Symptom : Many pits occur due to electrical corrosion, and wave-shaped Wear on raceway surface

Cause : Electrical corrosion

Part : Outer ring of a spherical roller bearing

Symptom : Wear with a wavy or concave-convex texture on loaded side of raceway surface

Cause : Entry of debris under repeated vibration while stationary

Part : Inner ring of a double-row tapered roller bearing

Symptom : Fretting Wear of raceway and stepped Wear on the rib face

Cause : Fretting progression due to excessive load while stationary

Part : Tapered rollers of damage “WEAR 3”

Symptom : Stepped Wear on the roller head end faces