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论述了拖拉机动力输出轴（ＰＴＯ）试验室的作用；并着重介绍了拖拉机动力输出轴（ＰＴＯ）试验室ＴＳ升降系统的结构特点、工作原理、主要零部件的设计及升降系统的试验结果分析。
The function of tractor PTO laboratory was discussed. The structural characteristics, working principle, design of main components and the test results of lifting system of PTO laboratory were emphatically introduced.