ＭＸＡ－３００型采煤机因摇臂滑动密封漏油，造成综采工作面停产，是多年来一直存在的难题，滑动密封频繁损坏，给煤矿带来很大的经济损失，尽管国内不少用户及厂家都在这方面采取不少措施，但效果不理想，本文从原理上查找滑动密封存在的问题和造成漏油的原因，提出了一整套切实可行的改进措施，较好地解决了这一多年来未解决的难题。 MXA-300 shearer sliding oil seal due to rocker arm, resulting in discontinued production of fully mechanized mining face, has been the problem over the years, frequent sliding seal damage to the coal mine to bring great economic losses, although many domestic users And manufacturers are taking a lot of measures in this regard, but the effect is not satisfactory, this paper from the principle of sliding seals to find the problems and causes of oil spills, put forward a set of practical improvements, a better solution to this Unresolved problems over the years.