YW40型履带式全液压挖掘机是一种全回转的小型通用挖掘机。根据作业需要,可以换装正铲、反铲、装载、抓斗、起重等多种工作装置。适用于城市建设、道路施工、管道敷设、农田水利等工程中挖掘Ⅱ～Ⅲ级土壤的工作。YW40型液压挖掘机的试制成功,满足了社会主义建设的需要,填补了液压挖掘机的系列空白。1974年底,样机试制出来后,除在厂内作整机性能试验外,为了进一步考核整机及液压元件的性能和质量,曾先后到八个使用现场进行了400多小时的工业性试验。共挖掘土方量约1.7万米~3。经过使用验证,说明机器性能良好,体积小,重量轻,操纵轻便灵活可靠,对各种土质和气候的适应性能较好,接地比压小,通过性好,便于维修,挖坑时坑底平整,是小型土方工程中不可缺少的一种机械, The Model YW40 crawler hydraulic excavator is a small universal excavator with full rotation. According to the needs of the operation, various working devices such as shovel, backhoe, loading, grab, and hoisting can be replaced. It is applicable to the work of excavating Grade II-III soils in urban construction, road construction, pipeline laying, and irrigation and water conservancy projects. The successful trial production of the YW40 hydraulic excavator satisfies the needs of socialist construction and fills a series of gaps in hydraulic excavators. At the end of 1974, after prototypes were prototyped, in addition to performance tests at the factory, in order to further evaluate the performance and quality of the complete machine and hydraulic components, more than 400 hours of industrial tests were performed at eight sites. A total of about 17,000 m3 of earthwork was excavated. Through the use of verification, it shows that the machine has good performance, small size, light weight, flexible and reliable operation, good adaptability to various soil and climate, small ground pressure, good passability, easy maintenance, pit formation at the time of digging Is an indispensable machine in small-scale earthworks.