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液压挖掘机在使用一段时间后，有的会出现动臂自动下降的现象，致使动臂起升速度减慢，甚至不能“举升”，严重影响工作效率。出现上述故障的主要原因有以下再方面：①液压缸油封损坏。②控制阀杆、阀孔出现技沟划伤或磨损。③控制该动作的过载阀损坏。④控制该动作的先导控制
After the hydraulic excavator is used for a period of time, some boom booms will automatically drop, resulting in slower lifting of the boom and even “lifting”, which will seriously affect work efficiency. The main reasons for the above failures are as follows: 1 The hydraulic cylinder oil seal is damaged. 2 The control valve stem and valve hole are scratched or worn. 3 The overload valve that controls this action is damaged. 4 Pilot control to control this action