Both for how the use of high quality products, in the use after a period of time, inevitably will be for some reason, and its related components produce certain damage caused to the manual pump application, too, in the interpretation of relevant professional and technical personnel, we can learn it easily damaged parts as follows:

1, is an important work of the pump impeller parts;

2, manual pump sliding bearing bush is copper tin alloy cast;

3, mouth ring also said leakage reduction or decrease grinding;

4, can harden after packing with long lost play;

5, oil seal is rubber.

    Due to reasons, such as manufacturing quality and use of the manual pump impeller may appear crack, due to cavitation effect surface litter eye or perforation, has long been blunt blade thinning or partial grinding, so pay particular attention to in use.