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When removing a bearing, it's essential to determine whether it can be reused. After removal, carefully inspect the raceway surface, rolling surfaces, and the condition of the mating surfaces. Check the wear on the cage, whether the bearing clearance is still appropriate, and if the precision has been reduced. Look for any signs of damage, abnormality, or small balls that have become detached. For non-detached bearings, use a flat-ended tool to rotate the inner ring and check if the outer ring moves smoothly.
For tapered roller bearings and other separable types, examine the rolling elements and outer ring for any issues. With large bearings, manual rotation may not be possible, so focus on the appearance of the rolling elements, raceway surfaces, cage, and ribs. The more critical the bearing’s role, the more thorough the inspection should be.
To decide if a bearing can be used again, consider factors such as the extent of damage, mechanical performance, importance, working conditions, and inspection frequency. However, if any of the following defects are found during the inspection, the bearing must be replaced with a new one:
- Cracks or gaps in the inner or outer rings, rolling elements, or cage
- A cracked inner or outer ring or rolling element
- Severe scratches on the rolling surface, ribs, or rolling elements
- Significant wear on the cage or loose rivets
- Rust or scars on the raceway or rolling elements
- Deep dents or bumps on the raceway or rolling elements
- Noticeable creep on the inner or outer diameter surfaces
- Severe discoloration due to overheating
- Damaged seals or dust covers in grease-sealed bearings
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Analysis of Inspection and Discrimination Methods for NSK Bearings
Source: China Bearing Network | Date: January 21, 2014