Typical bearing damage includes spalling, flaking, scoring, wear, discoloration, dents, fracture, rust, electrical erosion, raceway misalignment and cage damage.

Root causes include contamination, insufficient or excessive lubrication, incorrect fits, overload, vibration, misalignment, electrical current and improper handling. Inspect the raceways, rolling elements, seals and lubricant before selecting corrective action.

BNJ recommends a condition-based approach: identify the failure mode, correct the installation or operating cause, improve sealing and lubrication, and verify the result through inspection and monitoring.