... , so as not to damage the coupling. Belt wheel type pump units:the two pulleys must ... be aligned, the belt loose or tighten must be moderate. If the ... decrease properly2,pump shaft bended2,adjust or replace3,belt over taut3,adjust to relax the noise and ... the frame is unstable2,consolidate3,bearing wear seriously3,replace bearing4,bearing bended4,adjust or replaceThe shaft power ...