1、挖掘机行走，铲斗无动，动臂和斗杆缓慢移动。
1. When the excavator moves, the bucket does not move, and the boom and stick move slowly.
许多人在更换控制阀组件的密封件后报告此故障。接收铲斗后测量铲斗的压力为1.5Mpa，比正常值28.5Mpa小得多。准备交换两通时。满阀时，发现故障侧的位置是塞子，而原来的塞子的位置已安装满阀。交换正确位置后机器正常。维护人员更换了控制阀组件的密封件后，该阀和该组阀的塞子位置就颠倒了。
Many people reported this failure after replacing the seal of the control valve assembly. After receiving the bucket, the measured pressure of the bucket is 1.5Mpa, which is much lower than the normal value of 28.5Mpa. When preparing to exchange two-way. When the valve is full, it is found that the position of the fault side is the plug, and the original plug position has been installed with full valve. The machine is normal after exchanging the correct position. After the maintenance personnel replaced the seals of the control valve assembly, the plug positions of the valve and the group of valves were reversed.
2、改装成挖掘机和长臂后，整辆车又慢又弱。
2. After being converted into an excavator and a long arm, the whole car is slow and weak.
有人刚刚改变了先导泵的油封，但更换后十分钟一直正常，然后突然无法工作。根据这种情况，怀疑先导压力不足。挖掘机延长臂的先导压力非常低，因此决定分解先导泵。
Someone has just changed the oil seal of the pilot pump, but it has been normal for ten minutes after the change, and then suddenly it cannot work. According to this situation, first suspect that the pilot pressure is insufficient. The pilot pressure of the excavator extension arm is very low, so it is decided to disassemble the pilot pump.
发现先导泵输入轴的骨架油封被挤压的原因有两个：一个是安装问题，另一个是压力太高。继续分解，发现先导泵的油封方向相反。这是故障原因。开始工作时，骨架油封并未完全损坏，仍然可以正常工作。因为骨架油封只能承受低压，所以油封会迅速损坏，并且先导压力油会从损坏处泄漏。
There are two reasons for the extrusion of the skeleton oil seal of the input shaft of the pilot pump: one is the installation problem, and the other is the pressure is too high. Continue to disassemble and find that the oil seal of the pilot pump is in the opposite direction. This is the cause of the fault. At the beginning of work, the framework oil seal was not completely damaged and still can work normally. Because the skeleton oil seal can only bear low pressure, the oil seal will be damaged quickly, and the pilot pressure oil will leak from the damaged part.
3、发动机启动后，斗杆油缸的活塞杆会自动缩回。
3. After the engine is started, the piston rod of the stick cylinder will retract automatically.
经检查，其余动作正常。抬起启动臂后，斗杆下沉速度更快。更换斗杆后，故障仍在步，表明故障出在控制阀或斗杆油缸中，符合先易后难的原则。拆下控制阀杆，发现阀杆卡在活塞杆的缩回位置。用橡皮锤和铜棒振动并拆下阀杆。可以看出，有一条闪亮的铁尾巴，棍子下沉的速度更快。判断出故障的根本原因是挖掘机和长臂杆油缸的应变，这是在移走臂油缸后确定的。
After inspection, other actions are normal. After lifting the starting arm, the stick sinks faster. After replacing the stick, the fault is still in step, indicating that the fault is in the control valve or the stick cylinder, which is in line with the principle of "easy before difficult". Remove the control valve rod and find that the valve rod is stuck in the retracted position of the piston rod. Use a rubber hammer and a copper bar to vibrate and remove the valve rod. It can be seen that with a shiny iron tail, the stick sinks faster. It was determined that the root cause of the failure was the strain of the excavator and the long boom cylinder, which was determined after the boom cylinder was removed.
With the summary above, we hope to help our customers. If you have any questions or need help, please click our website: //www.wondgo.com Or call for consultation, and we will do our best to solve it for you
