(1) reason: low bearing precision method: choose the precision grade bearing.
(2) reason: spindle bending or box hole is not concentric. Method: repair spindle or box.
(3) reason: belt tight method: adjust the belt so that the tightness is appropriate.
(4) reason: bad lubrication method: select the specified grade of lubricating material and appropriate cleaning.
(5) reason: low assembly quality method: improve assembly quality.
(6): shell bearing: bearing replacement method of laps and wear parts.
(7) the axial force is too large: method of cleaning and adjusting the clearance of the sealing ring is required between 0.2 ~ 0.3mm, correcting the diameter of the balance hole of the impeller and checking the static balance value.
(8) bearing damage method: replace bearings.