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元件清洁度是指元件装配后清洗的清洁程度,也反映使用中元件被污染及磨损的情况。对液压元件进行维护性清洁度控制,可以有效地避免“早修”及“拖修”。1995年我国规定了各类液压元件的清洁度指标,即JB/T7858-95《液压元件清洁度评定方法及元件清洁度指标》行业标准。目前国际标准化组织正在制订评定液压元件清洁度的有关国际标准（ISO/CD18413,草案）,它包含样液采集、污染分析和数据报告的原则及具体方法等内容。 1.液压件常见污染故障分析 （1）元件磨损 使用中生成和侵入的污染物加剧了液压系统中元件的磨损。元件磨损的部位很多,如柱塞泵中滑靴与斜盘、缸体与配流盘、转向阀、助力器、齿轮啮合面和密封件
Component cleanliness refers to the cleanliness of components after assembly cleaning, but also reflect the use of components contaminated and worn. Maintenance of hydraulic components for cleanliness control, can effectively avoid the “early repair” and “drag repair.” In 1995, China provided a variety of hydraulic components cleanliness index, JB / T7858-95 “hydraulic components cleanliness assessment methods and components cleanliness index” industry standard. At present, the International Organization for Standardization is developing the relevant international standard (ISO / CD18413, draft) for assessing the cleanliness of hydraulic components. It contains the principles and specific methods of sample liquid collection, pollution analysis and data reporting. 1. Hydraulic parts common pollution fault analysis (1) component wear and tear generated during use and intrusion of contaminants exacerbated components of the hydraulic system wear and tear. Parts wear a lot of parts, such as the plunger pump sliding shoes and swash plate, the cylinder block and the valve plate, steering valve, booster, gear meshing surface and seal