长臂挖掘机租赁在使用的时候，会有的时候感觉长臂挖掘机的动臂和前臂不能抬起和伸出，那么为什么长臂挖掘机的延伸臂无法举起呢？一般来说故障基本上都是动臂和前臂的曲轴传感器损坏了，那么我们就得在使用挖掘机的时候，要防止因过度操作而发生长臂挖掘机的倾覆或碰撞。传感器有了这样的碰撞就是很容易损坏的，会发生故障或接地短路问题。
When the long arm excavator is in use, it sometimes feels that the boom and forearm of the long arm excavator can't be lifted and extended, so why can't the extended arm of the long arm excavator be lifted? Generally speaking, the fault is basically that the crankshaft sensor of boom and forearm is damaged, so we have to prevent the overturning or collision of long arm excavator due to excessive operation when using excavator. Sensor with such a collision is very easy to damage, there will be a fault or short circuit to ground.
当然也有可能是传感器依旧是正常的，但是机器仍无法正常工作，那么就很有可能是长臂挖掘机租赁的驱动管损坏了。那么在这种情况下，我们只能重新进行维修了，然后更换里面损坏的零件了。如果是在长臂挖掘机租赁的操作过程中，发现动臂比较的缓慢，那么我们就得检查一下是不是密封有问题了，然后将液压油释放出来，接着启动发动机，如果没有液压油流出来的话，就说明活塞密封的良好。
Of course, it is also possible that the sensor is still normal, but the machine is still unable to work normally, so it is very likely that the drive pipe of the long arm excavator is damaged. In this case, we have to repair it again, and then replace the damaged parts. If it is found that the boom is relatively slow during the operation of the long arm excavator, we have to check whether there is a problem with the seal, then release the hydraulic oil, and then start the engine. If there is no hydraulic oil flowing out, it means that the piston seal is good.
如果密封失效的话，这个就是属于内部泄露，我们需要进行维修了。还有就是检查吸气阀是不是正常的，他是可以保护我们的油路的，我们可以从油箱中吸油从而补充压力，可以很好的保护油路。
If the seal fails, this is an internal leak and we need to repair it. Another thing is to check whether the suction valve is normal. It can protect our oil circuit. We can absorb oil from the tank to replenish the pressure, which can protect the oil circuit.
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