Abstract: In trail operation of a turbofeed pump, the sudden vibration was occurred. After operation a period, the sudden vibration became frequently, the vibration amplitude became larger, and the vibration duration became longer. According to the diagnosis and analysis of the vibration fault, obvious lowfrequency vibration component had been found, and it is determined that there was fault in bearing shell of feed pump. The bearing shell had been treated; and then the sudden vibration was weakened and less than alarm limit, so the sudden vibration was decreased obviously or was eliminated basically.

Key words: feed pump, bearing, sudden vibration, oil film eddy, top clearance