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挖掘机加长臂改装后会出现哪些故障?

日期:2020-07-28   来源:
挖机右行走和铲斗无动作,动臂和斗杆动作慢
Excavator right travel and bucket no action, boom and stick action slow
据挖机老板反应在更换完控制阀总成的密封后即出现此故障。测后泵收铲斗时的压力为1.5Mpa,远小于正常值的28.5Mpa。在准备交换两路的阀时,发现故障一侧的阀位置上为一堵头而原堵头的位置却安装了阀。交换正确位置后机器正常。原来维修人员更换完控制阀总成的密封后,将该组阀的阀与堵头位置装反。
According to the owner of the excavator, the failure occurred after replacing the seal of the control valve assembly. After the measurement, the pressure of the bucket is 1.5MPa, which is far less than the normal value of 28.5mpa. When preparing to exchange two-way valves, it is found that the valve position on the fault side is a plug, while the original plug is installed with a valve. After exchanging the correct position, the machine is normal. After the original maintenance personnel replaced the seal of the control valve assembly, the valve and plug position of the group of valves were reversed.
改装成挖掘机加长臂后,全车慢、无力
After refitting the excavator to lengthen the arm, the whole vehicle is slow and powerless
机主反映刚更换了先导泵油封,但更换后工作了十几分钟一直很正常,然后突然就不行了。根据此情况,首先怀疑先导压力不足。经测试先导压力低,决定分解先导泵。发现先导泵输入轴的骨架油封已挤出,此原因有两种:一是安装问题,二是该处压力过高。继续分解发现先导泵的油封方向装反。此处才是故障的原因,当刚开始工作时,骨架油封没有完全损坏,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坏处泄出。
加金沙手机娱乐网址长臂挖掘机
The owner said that he 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 situation, it is first suspected that the pilot pressure is insufficient. After testing, the pilot pressure is low, so it is decided to disassemble the pilot pump. It is found that the skeleton oil seal of the input shaft of the pilot pump has been squeezed out. There are two reasons for this: one is the installation problem; the other is that the pressure is too high. Continue to decompose, found that the oil seal direction of the pilot pump is reversed. This is the cause of the failure. When the framework oil seal was just started to work, it was not completely damaged, but could still work normally. Because the framework oil seal could only bear low pressure, the oil seal was quickly damaged, leading to the pilot pressure oil leaking from the damaged place.
改装成挖掘机加长臂后,发动机起动后斗杆油缸的活塞杆自动缩回,其它动作正常
After refitting the excavator to lengthen the boom, the piston rod of the stick cylinder retracts automatically after the engine starts, and other actions are normal
经检查,一其余动作正常;二提起动臂后斗杆下沉较快。交换斗杆先导管后故障依旧,说明故障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位置,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。判断故障根源为挖掘机加长臂斗杆缸筒拉伤,拆检斗杆油缸后证实。
After inspection, one of the other actions is normal; the second one sinks quickly after lifting the boom. After exchanging the dipper stick, the failure is still the same, indicating that the fault is in the control valve or stick cylinder, in line with the principle of easy before difficult. When the control valve rod was disassembled and inspected, it was found that the valve rod was stuck in the retracted position of the piston rod. The valve rod was removed after being vibrated with rubber cocks and copper rods. It can be seen that there are shining iron dust, and the connecting bucket stick sinks quickly. It was determined that the root cause of the failure was the pull of the bucket rod cylinder of the excavator's lengthening arm, which was confirmed after the removal and inspection of the stick cylinder.
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