在伟大领袖毛主席关于“独立自主、自力更生”方针指引下,我厂与天津工程机械研究所共同设计试制了 YW40履带式全液压挖掘机(图1)。样机经整机性能、液压元件的测试和400小时连续作业的工业性试验,于1976年6月通过国家鉴定,现已小批生 Under the guideline of the great leader Chairman Mao on the “independent, self-reliance” principle, our factory and the Tianjin Institute of Construction Machinery jointly designed and trial-produced the YW40 crawler-type hydraulic excavator (Figure 1). The prototype has passed the test of the performance of the complete machine, the testing of hydraulic components, and the industrial test of 400 hours of continuous operation. It passed the national appraisal in June 1976 and is now a small batch of students.