一，failure: bearing life is short.

二, the reason:

(1) pump shaft axis and prime mover, shaft bending;

(2) the rotational part and fixed part scratches occurred;

(3) impeller imbalance;

(4) the debris in lubricating oil.

三, solution:

(1) the correction or replacement;

(2) reset;

(3) change the impeller;

(4) to replace.