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长期以来,工程机械液压系统的清洁度问题一直影响产品质量提高。据国内有关资料统计,工程机械由于液压系统不清洁出现的故障占整机故障率的40%,而由于液压油管内部不清洁造成的故障占液压系统故障率的60%。由此可见,提高液压系统的清洁度对于提高产品质量是何等的重要。 随着国际国内工程机械发展速度的加快,采用高新技术的液压控制元件、动力元件和执行元件越来越普及,相对的要求液压系统清洁度也就越来越严。 影响液压系统清洁度的因素很多,在液压系统中,液压动力元件（液压泵）、执行元件（液压缸）、控制调节元件（各种控制阀）、辅助装置（油箱、滤油器、油管及管接头）的清洁度,都会直接影响到装载机的性能和参数,直接影
For a long time, the hydraulic system cleanliness of construction machinery has been the impact of product quality improvement. According to domestic statistics, construction machinery hydraulic system due to unclean failures accounted for 40% of the failure rate of the whole machine, but due to the internal hydraulic tubing failure caused by failures accounted for hydraulic system failure rate of 60%. This shows that improving the cleanliness of the hydraulic system for improving the quality of products is how important. With the development of international and domestic construction machinery speeding up, the use of high-tech hydraulic control components, power components and actuators more and more popular, the relative requirements of hydraulic system cleanliness will be more stringent. There are many factors that affect the cleanliness of the hydraulic system. Among the hydraulic systems, hydraulic power units (hydraulic pumps), actuators (hydraulic cylinders), control regulators (various control valves), auxiliary devices (fuel tanks, oil filters, Pipe fittings) cleanliness, will directly affect the performance and parameters of the loader, direct shadow