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- Over / Under lubrication
- Misalignment
- Improper fit or mounting that causes vibration, creep / scuffing
- Shaft burrs
- Improper bearings selection based on speed , operating temperature or improper seals
- Debris and dust contamination from the environment or in lubricant
- Improper grease / lubricant selection
- Water contamination
- Improper Mounting
- Improper handling ( Bearings will show hitting scar, pressing scar and breaking scars if they are used carelessly and struck forcefully )
- Poor or irregular maintenance