原国家机械委重型局于1988年4月4～8日在石家庄井陉矿召开了YOXS400水介质液力偶合器技术鉴定会。代表们听取了北京起重运输机械研究所的研制工作汇报,进行了充分讨论,一致认为: (1)提供鉴定的文件及图纸完整、正确,基本上贯彻了国家标准,可以指导生产; The former State Machinery Commission’s Heavy Industry Bureau held a YOXS400 hydromechanical fluid coupling technology appraisal meeting on April 4th-8th, 1988 in Jingkai Mine, Shijiazhuang. Delegates heard the report of the development work of the Beijing Lifting and Transportation Machinery Research Institute and conducted full discussions. They agreed that: (1) The documents and drawings provided for identification are complete and correct, and basically implement the national standards and can guide production;