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The following points may cause the shaft rotation failure:
First, the lubrication failure, oil level and bearing clearance.
Second, the influence of cleanliness, debris.
Third, friction in oil seal, shaft shoulder and seal, anti-loosening sheet (solar sheet).
Forth, the concentricity of the shaft is not right, and the axial jam caused by cross positioning.
Fifth, the bearing box has low accuracy and distortion.
