Common causes of bearing abnormal noise:

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

2. Dirt such as water, acid or paint is mixed into the bearing to cause decay;

3. The clearance of the bearing is too small (inappropriate selection of fit);

4. Wrong selection of lubricating oil or grease;

5. Insufficient lubrication (oil level is too low, oil or sticky through seal leakage);

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

7. The pad iron on the bottom surface of the bearing seat is uneven (the hole in the guide seat is deformed and even cracks appear in the bearing seat);

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

9. The sealing ring is eccentric (touching adjacent parts and causing friction);

10. Bearing to extra load (bearing to axial rail tight, or only two fixed end bearings on one shaft);

11. The thermal elongation of the shaft is too large (the bearing is subject to static axial additional load);

12. The clearance of the bearing is too small, and it is too tight when rotating (the adapter sleeve rotates too tightly;

13. The bearing is noisy (the end face of the roller or the steel ball is slipping.

14. The fit between the bearing and the shaft is too loose (the straight line of the shaft is too small or the tension set sleeve is not tightened);

15. The shaft shoulder is too large (it hits the encrypted parts of the bearing and generates friction);

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

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

18. The teeth of the lock washer are bent (touching the bearing and rubbing);

19. The position of the oil throwing ring is not suitable (touching the flange cover and causing friction);

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

21. There is noise in the bearing (interference with external vibration source);

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

23. The shaft is too thick to make the actual fit too tight (cause the bearing temperature is too high or noise occurs);

24. The bearing is noisy (the bearing has fretting abrasion);

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 becomes larger (the non-ferrous metal bearing seat hole is enlarged, or becomes larger due to thermal expansion);

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

28. The cage is broken;

29. Steel balls and track wear (the grinding department is qualified or the product is bruised)