1, grease has impurities;
2, insufficient lubrication (oil level is too low, improper preservation of oil or fat leakage through the seal);
3, the bottom of the bearing seat pad iron uneven (resulting in deformation of the seat hole or even cracks in the bearing seat);
4, there are debris in the bearing seat hole (residual chips, dust particles, etc.);
5, the sealing ring eccentric (encounter adjacent parts and friction);
6. Bearing is subjected to additional load (bearing is axial lamed, or there are two fixed end bearings on the root shaft);
7, bearing clearance is too small or too large (the manufacturer's problem);
8, bearing mixed with sand or carbon particles and other impurities, play the role of abrasive;
9, bearing mixed with water, acid or paint and other dirt, play a corrosive role;
10, bearing is flat seat hole clamp (seat hole roundness is not good, or seat hole distortion is not straight);
11, bearing and shaft match is too loose (shaft diameter is too small or the set sleeve is not tightened);
12, bearing clearance is too small, rotation is too tight (tight set sleeve is too tight);
13, bearing noise (roller end or steel ball skid caused by);
14. The diameter of the seat hole is too small (causing the bearing temperature to be too high);
15, bearing seat hole diameter is too large, the actual fit is too loose (bearing temperature is too high - outer ring slip);
16, bearing seat hole becomes larger (non-ferrous metal bearing seat hole is supported, or because of thermal expansion and become larger);
17. The cage is broken.
18. Bearing raceway is rusty.
19, steel ball, raceway wear (grinding processing unqualified or bruised products).
20. The raceway of the ring is not qualified (the problem of the manufacturer).
21. The thermal elongation of the shaft is too large (the bearing is subjected to statically indeterminate axial additional load);
22, shaft shoulder is too large (encounter bearing seals and friction);
23, the block shoulder of the seat hole is too large (the bearing seal is distorted);
24, labyrinth seal ring gap is too small (friction with the shaft);
25. The tooth of the lock washer is bent (it encounters the bearing and causes friction);
26, the position of the oil dumping ring is not appropriate (encounter flange cover and friction);
27, the steel ball or roller has a pressure pit (caused by hammering the bearing during installation);
28, bearing noise (external vibration source interference);
29, bearing heat discoloration and deformation (caused by the use of spray gun heating disassembly bearing);
30, the shaft is too thick to make the actual fit too tight (cause bearing temperature is too high or noise)
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