Abstract: This paper reviews the existing theory for pump contaminant wear and the test method of pump contaminant sensitivity. The effect of contaminant abrasivity, particles size and distribution on the wear of hydraulic pumps was investigated. It was proved that the life of the pump is dependent on the abrasivity of the contaminants in practical system and the relation between the size of the clearance of the key moving parts in the pump and the size of the contaminants. A hydraulic pump contaminant wear model was established. As a result of this, the service life of the pump can be predicted.

Key words: 磨损, 污染, 液压泵