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  • Summary of inspection points for centrifugal pump maintenance:1. Inspection of pump shaft • First clean the pump shaft with kerosene, polish the surface of the pump shaft with sandpaper, and check whether there are grooves and wear on the surface. • At the same time, check the wear of the keyway on the shaft. If the wear of the keyway is too large, reopen the keyway at 1800 opposite the pump shaft.