The performance of hydraulic pump will directly affect the normal work of the entire hydraulic system, so it is essential for its condition monitoring and fault prediction. It collects vibration signal and pressure signal for hydraulic pump which degenerates from the normal state to loose slipper state. It uses wavelet packet to decompose energy of frequency area in order to get fault feature vectors and builds support vector machine prediction model for feature vectors, then predicts possible fault by D-S evidence theory. The experiment results show that the method can effectively predict fault for hydraulic pump.

A portable detection system is designed for solving the problems of too many individual equipment, great difficulty in detection and lack of special detection and repair equipment. This system have the functions of fault detection, fault locating and repair instruction, so its detection functions are better, especially suitable for field work. Through experiments, it is found that the system has the advantages of high degree of automation, openness and quick detection and can adapt to the need of repair.