1. Oil has impurities;
2. Insufficient lubrication (the oil level is too low, and improper storage causes oil or grease to leak through the seal);
3. The bearing clearance is too small or too large (manufacturer's problem);
4. Impurities such as sand or carbon particles are mixed in the bearing to play a grinding role;
5. The bearing is mixed with dirt such as water, acid or paint, which plays a corrosive role;
6. The bearing is flattened by the seat hole (the roundness of the seat hole is not good or the seat hole is not straight);
7. Uneven shim on the bottom surface of the bearing seat (resulting in deformation of the seat hole and even cracks in the bearing seat);
8. There are sundries (debris, dust particles, etc.). ) in the bearing hole;
9. Eccentricity of sealing ring (contact with adjacent parts and friction);
10. Bearing bears additional load (bearing bears axial buckling, or one shaft has two fixed-end bearings);
1 1. The bearing is loosely fitted with the shaft (the shaft diameter is too small or the fastening sleeve is not tightened);
12. The bearing clearance is too small and it is too tight when rotating (the fastening sleeve is too tight);
13. Bearing noise (caused by roller end face or steel ball slipping);
14. The thermal elongation of the shaft is too large (bearing bears statically indeterminate axial additional load);
15. The shoulder is too big (it touches the seal of the bearing and has friction);
16. The shoulder of the seat hole is too large (bearing seal is deformed);
17. The clearance of labyrinth seal ring is too small (friction with shaft);
18. The teeth of the locking washer are bent (touching the bearing, rubbing);
19. The position of the oil slinger is not appropriate (there is friction when touching flange cover);
20. There is a pressure pit on the steel ball or roller (caused by hitting the bearing with a hammer during installation);
2 1. Bearing has noise (interfered by external vibration source);
22. The bearing is discolored and deformed when heated (caused by removing the bearing with a spray gun);
23. The shaft is too thick to make the actual fit too tight (causing the bearing temperature to be too high or noise);
24. The diameter of the seat hole is too small (causing the bearing temperature to be too high);
25. The bearing bore is too large and the actual fit is too loose (bearing temperature is too high-the outer ring slips);
26. Enlarged bearing hole (enlarged bearing hole of nonferrous metal, or enlarged due to thermal expansion);
27. the cage is broken
28. The bearing raceway is rusted.
29. Wear of steel ball and raceway (unqualified grinding or bruised products).
30. The raceway of the ferrule is unqualified (manufacturer's problem).
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