故障Ｉ：转台向一个方向旋转时正常，向另一方向旋转时转速缓慢ＷＹＬ６０型挖掘机在施工中，突然出现转台向某一方向旋转时转速变得缓慢。开始，操作手以为是操纵阀的阀杆不到位，经查，操纵阀工作正常；于是我们将两个马达安全阀对调安装，结果，这个方向的旋转变为正常，而 Fault I: Normal when the turntable rotates in one direction, and slow when rotating in the other direction In the construction of the WYL60 excavator, the rotation speed suddenly becomes slow when the turntable rotates in one direction. At the beginning, the operator thought that the stem of the valve was not in place. After investigation, the valve was working properly; then we installed the two motor safety valves in reverse. As a result, the rotation in this direction became normal.