After the bearing is installed, when the bearing outer ring or shaft is rotated by hand, the rotation is not flexible. The main reasons are as follows:
1. Iron oxide scale, dust and other dirt enter the bearing, causing pad pressure and grinding;
2. Water, acid, alkali and other corrosive media enter the bearing, causing the bearing to rust;
3. The bearing clearance is too small, or the inner ring expands too much due to temperature rise when the bearing is working;
4. Insufficient, excessive or dry lubricant;
5. The manufacturing accuracy of journal, shoulder and bearing seat is too low or deformed in use;
6. Incorrect installation seal, such as too tight seal or friction between seal and relevant parts;
7. Cage deformation;
8. Axial preload of preloaded bearing is too large.
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