Under what conditions should replace the old bearing？

Bearing is a high-speed rotating mechanical part, which should be replaced in time after the product lifecycle or damage occurs to avoid damage to the equipment.
So under what circumstances need to be replaced?
1. Large radial or axial clearance;
2. Bearing raceway has defects such as pitting, potholes, etc;

3. Bearing discoloration or axle hung due to lack of lubrication;

4. Bearing cage damage;

5. The ball or rollers are not round or broken;

6. Bearing rotation is not flexible or often stuck;

7. Crack in the inner or outer ring of the bearing;

8. Continuous operation has reached the end of its life;