一、前言为使国产液压油适应国内液压技术的发展,三部联合成立了液压油专业组,共同研制我国的液压油系列。经过几年来的努力,已在液压油的研制、试验、生产、供应和使用方面做了大量的工作,并在实际使用中取得了一定的效果。但还没有被更多的人所认识,使用还很不普遍,绝大多数液压系统仍把机械油作为液压油使用,造成液压设备使用寿命短,运转不正常和液压元件磨损严重等。要改变这种局面,就必须深入实地了解各机械行业使用液压油的经验和存在问题,宣传合理使用液压油的意义,为开展应用研究落实更多的液压油试验 I. Preface In order to make homemade hydraulic oil to adapt to the development of domestic hydraulic technology, the three jointly set up a professional group of hydraulic oil, joint development of China’s hydraulic oil series. After several years of hard work, a great deal of work has been done on the research, testing, production, supply and use of hydraulic oil, and some results have been achieved in actual use. But it has not been recognized by more people. Its use is still not widespread. Most hydraulic systems still use mechanical oil as hydraulic oil, resulting in short service life of hydraulic equipment, abnormal operation and severe wear of hydraulic components. To change this situation, we must thoroughly understand the experience and problems of using hydraulic oil in various machinery industries, promote the significance of rational use of hydraulic oil, carry out more hydraulic oil tests for application research