Fluorine plastic pump with a unique pull-type structure, one person can easily internal maintenance and parts replacement, without removing the pipe, greatly facilitate the routine maintenance and repair work. However, in the daily use can not avoid the failure, now on several common failure analysis: 1. Pump cavitation caused by the problem: Pump cavitation causes mainly pump inlet tube resistance, medium more gas, filling pump is not sufficient, the pump inlet can not enough and other reasons. Cavitation is the most damaging to the pump. Severe pump vibration during cavitation and serious balance damage will cause damage to the fluoroplastic pump bearings, rotors or impellers. This is a common cause of failure of the South brand magnetic pump. 2. No medium or medium flow rate is small: the rotor shaft and the stability of the dry friction bearings, burning bearings. Southern brand magnetic pump is provided by the transmission medium to the sliding bearing lubrication and cooling, without opening the valve in the case of the outlet valve or valve, the sliding bearing lubrication and cooling without the transmission medium caused by high temperature and thus damaged.