The cause of the fault (1) Grease too much or too little; (2) oil bad quality impurities; (3) bearing journal or end cap mismatch (too loose or too tight); (4) bearing bore eccentric, rub with the shaft; ⑤ motorcover or the bearing cap is not installed level uncorrected; the ⑥ motor load coupling or belt too tight; (7) bearing gap is too large or too small; ⑧ motor shaft bending.

    Troubleshooting (1) according to the provisions of grease (1/3-2/3 of the volume); (2) replace the clean grease; (3) Pine available binder repair, car too tight, grinding the journal or cover bore, fit; ④ repair bearing cap to eliminate the rub; the ⑤ re-assembly; the ⑥ recalibrate, adjust the belt tension; ⑦ replace the new bearing; ⑧ correction motor shaft or replace the rotor.