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Most failuresin hydraulicsystemsof constructionmachinery come from the contaminationin hydraulicsystem.The study on incomingpath of contaminationis very importantto its control.Differentcontaminatingways are summarizedand classified,and differenttest mannersof contaminationde-gree are presentedin the article.It is instructiveto the op-erationof constructionmachineryon sitesto avoidhydraulic contamination.
Most failuresin hydraulicsystemsof constructionmachinery come from the contaminationinhydraulicsystem.The study on incomingpathof contaminationis very importantto itscontrols .Differentcontaminatingwaysasoducedanddifferenttest mannersof contaminationde-gree are presentedin the article. It is instructiveto the op-erationof constructionmachineryon sitesto avoidhydraulic contamination.