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Ｔ１２０Ａ推土机铲刀采用液压控制，具有操纵轻便灵活的特点，铲刀升降控制自如。但是随着使用时间的增加有时也会出现一些故障，以致影响功能的发挥，甚至无法进行施工作业。我部的一台Ｔ１２０Ａ推土机在一次施工作业中，突然发生铲刀失控（铲刀即升不起来也压不下去，处于
The T120A bulldozer blade is hydraulically controlled, featuring light and flexible handling, and easy blade lift control. However, with the increase in the use of time, some malfunctions may occur, which may affect the function and even prevent the construction work. In one construction operation of a T120A bulldozer in our department, the blade suddenly became out of control (the blade could neither rise nor fall,