Reason: the damage of bearing; rolling bearing or bracket cover too small clearance; two shafts are not concentric shaft bending or too tight; tape; lack of oil or oily bad; the impeller impeller balance pore blockage, loss of balance, increase the thrust to one side.

Elimination: replacement of bearings; removal of the rear cover, the bracket and the bearing seat is installed between the gasket; investigation of two-axle shaft or adjust the concentricity; appropriate pine belt tension; filling clean grease, grease for bearing gap in 60%; to remove the plug hole material balance.

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