1、挖掘機行走，鏟斗無動，動臂和斗桿緩慢移動。
1. When the excavator moves, the bucket does not move, and the boom and stick move slowly.
許多人在更換控制閥組件的密封件后報告此故障。接收鏟斗后測量鏟斗的壓力為1.5Mpa，比正常值28.5Mpa小得多。準備交換兩通時。滿閥時，發現故障側的位置是塞子，而原來的塞子的位置已安裝滿閥。交換正確位置后機器正常。維護人員更換了控制閥組件的密封件后，該閥和該組閥的塞子位置就顛倒了。
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、改裝成挖掘機和長臂后，整輛車又慢又弱。
2. After being converted into an excavator and a long arm, the whole car is slow and weak.
有人剛剛改變了先導泵的油封，但更換后十分鐘一直正常，然后突然無法工作。根據這種情況，懷疑先導壓力不足。挖掘機延長臂的先導壓力非常低，因此決定分解先導泵。
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.
發現先導泵輸入軸的骨架油封被擠壓的原因有兩個：一個是安裝問題，另一個是壓力太高。繼續分解，發現先導泵的油封方向相反。這是故障原因。開始工作時，骨架油封并未完全損壞，仍然可以正常工作。因為骨架油封只能承受低壓，所以油封會迅速損壞，并且先導壓力油會從損壞處泄漏。
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、發動機啟動后，斗桿油缸的活塞桿會自動縮回。
3. After the engine is started, the piston rod of the stick cylinder will retract automatically.
經檢查，其余動作正常。抬起啟動臂后，斗桿下沉速度更快。更換斗桿后，故障仍在步，表明故障出在控制閥或斗桿油缸中，符合先易后難的原則。拆下控制閥桿，發現閥桿卡在活塞桿的縮回位置。用橡皮錘和銅棒振動并拆下閥桿?？梢钥闯?，有一條閃亮的鐵尾巴，棍子下沉的速度更快。判斷出故障的根本原因是挖掘機和長臂桿油缸的應變，這是在移走臂油缸后確定的。
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.
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