Common causes of abnormal noise in bearings:

1. Impurities such as sand or carbon particles are mixed into the bearing, acting as abrasives;

2. Impurities such as water, acids or paint are mixed into the bearing, acting as corrosives;

3. The clearance of the bearing is too small (improper matching);

4. The type of lubricant or grease is not selected correctly;

5. Insufficient lubrication (the oil level is too low, and the oil or grease leaks through the seal);

6. The bearing is flattened by the seat hole (the roundness of the seat hole is not good, or the seat hole is twisted and not straight);

7. The shim on the bottom of the bearing seat is uneven (causing the seat hole to deform or even crack the bearing seat);

8. There are debris in the bearing seat hole (residual chips, dust particles, etc.);

9. The seal ring is eccentric (touches adjacent parts and causes friction);

10. The bearing is subjected to additional load (the bearing is axially tightened, or there are two fixed-end bearings on one shaft);

11. The thermal expansion of the shaft is too large (the bearing is subjected to statically indeterminate axial additional load);

12. The clearance of the bearing is too small and it is too tight when rotating (the adapter sleeve is tightened too much);

13. The bearing makes noise (caused by the end face of the roller or the steel ball slipping);

14. The fit between the bearing and the shaft is too loose (the diameter of the shaft is too small or the adapter sleeve is not tightened);

15. The shaft shoulder is too large (touches the seal of the bearing and causes friction);

16. The shoulder of the seat hole is too large (the seal of the bearing is distorted);

17. The gap of the labyrinth seal is too small (friction occurs with the shaft);

18. The teeth of the locking washer are bent (touches the bearing and causes friction);

19. Oil throwing The position of the ring is not appropriate (it hits the flange cover and causes friction);

20. There are pressure pits on the steel ball or roller (caused by hitting the bearing with a hammer during installation);

21. The bearing is noisy (interference from external vibration sources);

22. The bearing is discolored and deformed due to heat (caused by using a spray gun to heat and disassemble the bearing);

23. The shaft is too thick, making the actual fit too tight (causing the bearing temperature to be too high or noise);

24. The bearing is noisy (the bearing has micro-motion wear);

25. The diameter of the bearing seat hole is too large, and the actual fit is too loose (the bearing temperature is too high-the outer ring slips);

26. The bearing seat hole is enlarged (the bearing seat hole of non-ferrous metals is enlarged, or enlarged due to thermal expansion);

27. The diameter of the seat hole is too small (causing the bearing temperature to be too high);

28. The retainer is broken;

29. The steel ball and track are worn (the grinding part is qualified or the product is bruised).

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