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论述了变量泵及变（定）星马达在电动铲运机的使用与维修中的重要性，以及变量泵、变（定）量马达修复、试验装置的研究与试制，为生产过程中的及时应用和生产成本的降低提供了可靠保证。
The importance of variable displacement pump and variable (fixed) star motor in the use and maintenance of electric scraper, and the research and trial production of variable displacement pump, variable displacement motor and testing device are discussed. Application and production costs to provide a reliable guarantee for the reduction.