挖掘机加长臂如今是十分常见的，由于它能够更好的帮助挖掘机实现建筑基础、河道、深沟等土石方发掘作业，而且所呈现出的功能也是显而易见的，可是在运用了挖掘机加长臂之后往往会呈现一些毛病，故障都是什么呢？下面小编来为您好好介绍。

　　It is very common to use the long arm of excavator now, because it can better help the excavator to excavate the earth and stone works such as building foundation, river course, deep ditch, etc., and the functions presented are also obvious, but after using the long arm of excavator, there are often some problems, what are the faults? Here is a brief introduction.

　　挖机右行走和铲斗无动作，动臂和斗杆动作慢

　　No action of excavator right travel and bucket, slow action of boom and stick

　　很多人反映在替换完控制阀总成的密封后即呈现此毛病。测后泵收铲斗时的压力为1.5Mpa，远小于正常值的28.5Mpa。在预备交流两路的阀时，发现毛病一侧的阀方位上为一堵头而原堵头的方位却装置了阀。交流正确方位后机器正常。原来维修人员替换完控制阀总成的密封后，将该组阀的阀与堵头方位装反。

　　Many people reported that after replacing the seal of the control valve assembly, the problem appeared. After the test, the pressure when the pump retracts the bucket is 1.5MPa, far less than the normal value of 28.5mpa. When preparing the safety valve of two-way alternating current, it is found that the direction of the safety valve on the faulty side is a plug while the direction of the original plug is equipped with a safety valve. The machine is OK after the AC is in the correct orientation. After the original maintenance personnel replaced the seal of the control valve assembly, the safety valve and plug of the group of valves were installed in the opposite direction.

　　改装成挖掘机加长臂后，全车慢、无力

　　The whole car is slow and weak after it is refitted into an excavator with a long arm

　　有人反映刚替换了先导泵油封，但替换后工作了十几分钟一向很正常，然后突然就不行了。根据此状况，怀疑先导压力不足。

　　Some people said that they had just replaced the oil seal of the pilot pump, but it worked normally for more than ten minutes after the replacement, and then it suddenly failed. Based on this condition, suspect insufficient pilot pressure first.

　　经测验先导压力极低，决议分化先导泵。

　　After testing, the pilot pressure is very low, which determines the differentiation of the pilot pump.

　　发现先导泵输入轴的骨架油封已挤出，此原因有两种：一是装置问题，二是该处压力过高。继续分化发现先导泵的油封方向装反。此处才是毛病的真正原因，当刚开始工作时，骨架油封没有彻底损坏，仍可正常工作，因骨架油封只能承受低压，故油封很快损坏，导致先导压力油从损害处泄出。

　　The first discovery is that the framework oil seal of the input shaft of the pilot pump has been extruded. There are two reasons for this: one is the device problem, the other is that the pressure there is too high. Further differentiation found that the oil seal of the pilot pump was installed in the opposite direction. This is the real cause of the fault. When the skeleton oil seal was first working, it was not completely damaged, and it can still work normally. Because the skeleton oil seal can only bear low pressure, so the oil seal was quickly damaged, leading to the leakage of pilot pressure oil from the damage.

　　发动机起动后斗杆油缸的活塞杆主动缩回

　　The piston rod of the stick cylinder retracts actively after the engine is started

　　经查看，一其他动作正常；二提起动臂后斗杆下沉较快。交流斗杆先导管后毛病依旧，阐明毛病在控制阀或斗杆油缸，本着先易后难的原则。拆检控制阀杆，发现阀杆卡在活塞杆缩回方位，用橡胶螂头和铜棒震动后取出阀杆。可见有闪亮铁末，联系斗杆下沉较快。判别毛病根源为加长臂斗杆缸筒拉伤，拆检斗杆油缸后证实。

　　After checking, one of the other actions is normal; the other is that the stick sinks faster after lifting the boom. The problems of the AC stick are still the same after the guide pipe. It is clarified that the problems are in the control valve or stick oil cylinder, based on the principle of "easy first, then difficult". Disassemble and inspect the control valve rod, and find that the valve rod is stuck in the retracted position of the piston rod. Remove the valve rod after shaking with rubber Mantis head and copper rod. It can be seen that there is shiny iron dust, and the connecting stick sinks faster. Identify the root cause of the problem as the elongated arm stick cylinder, and confirm after disassembling and inspecting the stick cylinder.

　　上面便是小编为您详细介绍的关于加长臂改装上之后一切可能呈现出的一些常见毛病问题，可是请各位不用太过紧张，都是可以经过正确的办法进行有用处理的。

　　The above is a detailed introduction of some common problems that may appear after the long arm is refitted. However, please don't be too nervous. You can handle them in a correct way.