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30 reasons for bearing noise, summarized by a top student! 1. The oil contains impurities ； 2. Insufficient lubrication (too low oil level, or improper storage causing oil or grease to leak through seals) ； 3. The bearing clearance is too small or too large (manufacturer issue) ； 4. Impurities such as sand particles or carbon particles mixed in the bearings act as abrasives ； 5. Moisture, acids, or contaminants such as paint getting into the bearings can cause corrosion ； 6. The bearing is flattened by the seat hole (the roundness of the seat hole is poor, or the seat hole is twisted and not straight) ； 7. The shims on the bottom surface of the bearing housing are uneven (causing deformation of the housing bore and even cracks in the bearing housing) ； 8. There are debris in the bearing seat hole (residual chips, dust particles, etc.) ； 9. Seal ring eccentricity (contacting adjacent parts and causing friction) ； 10. The bearing is subjected to additional loads (the bearing is under axial compression, or there are two fixed-end bearings on one shaft) ； 11. The fit between the bearing and the shaft is too loose (the diameter of the shaft is too small or the retaining ring is not tightened properly) ； 12. The bearing clearance is too small, resulting in tight rotation (the set screw is tightened too much) ； 13. The bearing makes noise (caused by sliding of the roller end faces or steel balls) ； 14. Excessive thermal expansion of the shaft (the bearings are subjected to indeterminate axial additional loads); 15. Excessively large shaft shoulder (it contacts the seals of the bearings, causing friction) ； 16. The shoulder of the seat hole is too large (causing the seal provided with the bearing to become distorted) ； 17. The gap of the labyrinth seal ring is too small (friction occurs with the shaft) ； 18. Bending of the lock washer teeth (contacting the bearing and causing friction) ； 19. The oil slinger is in the wrong position (it touches the flange cover and causes friction) ； 20. Dents on the steel balls or rollers (caused by hitting the bearing with a hammer during installation) ； 21. The bearing makes noise (due to external vibration sources) ； 22. The bearing changes color and deforms due to heat (caused by using a torch to heat it while removing the bearing) ； 23. The shaft is too thick, resulting in excessive tightness in the fit (causing high bearing temperatures or noise) ； 24. The diameter of the seat hole is too small (causing excessive bearing temperature) ； 25. The bearing housing hole diameter is too large, resulting in an overly loose fit (high bearing temperature – sliding of the outer ring) ； 26. The bearing seat hole expands (the bearing seat hole of non-ferrous metals is enlarged, or it expands due to thermal expansion) ； 27. Cage fracture. 28. The bearing raceways are rusted. 29. Wear of steel balls and raceways (poor grinding quality or product damage). 30. The ring raceway is defective (manufacturer’s issue).