介绍了一起调速器检修中国清洁度差而造成机车在线路运行时，正常回手柄即停机，继而无法起机的典型故障。它从一个侧面向人们说明在机车新造或大修中，零部件清洁度的重要性。 A typical failure with a governor that repairs a poor cleanliness in China and causes the locomotive to return to its normal position when the locomotive is operating in the line is shown. From one side, it shows people the importance of cleanliness of components during new or overhauled locomotives.