The reason why the bearing is ringing
Grease has impurities
Insufficient lubrication
The clearance of the bearing is too small or too large
The bearing is mixed with impurities such as sand or carbon particles to act as an abrasive.
The bearing is mixed with moisture, acid or paint, which acts as a corrosive effect.
The bearing is flattened by the seat hole
The horn of the bottom of the bearing housing is uneven
There is debris in the housing bore
Seal eccentric
Bearings are subject to additional loads
The bearing and the shaft are too loose
The clearance of the bearing is too small and it is too tight when rotating
Bearing has noise
The thermal elongation of the shaft is too large
Shoulder shoulder too big
The shoulder of the seat hole is too large
The gap of the labyrinth seal is too small
The teeth of the lock washer are bent
The position of the oil ring is not suitable
There is a crater on the steel ball or roller
Bearing noise
The bearing is discolored and deformed by heat
The shaft is too thick to make the actual fit too tight
The diameter of the seat hole is small
The bearing housing hole diameter is too large, the actual fit is too loose
Housing bore becomes larger
Cage break
Bearing raceway rust
Steel ball, raceway wear
Ferrule raceway failed
