1：輪式挖掘機右走動和挖斗無姿勢，動臂和斗桿動作慢

1: Wheeled excavators have no posture when walking to the right and digging the bucket, and the movement of the boom and stick is slow

據輪式挖掘機老總反映在拆換完調壓閥總程的密封性后即發生此故障。測后泵收挖斗時的壓力為1﹒5Mpa，遠低于標準值的28﹒5Mpa。在提前準備互換雙路的閥時，發覺故障一側的閥部位上為一堵頭而原堵頭的位置卻安裝了閥?；Q恰當部位后設備一切正常。原先維修人員拆換完調壓閥總程的密封性后，將該組閥的閥與堵頭部位安反。

According to the CEO of a wheeled excavator, this malfunction occurred after the sealing of the pressure regulating valve was removed and replaced. The pressure when the pump collects the excavator bucket after measurement is 1.5Mpa, which is much lower than the standard value of 28.5Mpa. When preparing for the exchange of dual safety valves in advance, it was found that the safety valve on the faulty side had a plug, while the original plug was installed with a safety valve. After exchanging the appropriate parts, everything in the equipment is normal. After the original maintenance personnel replaced the sealing of the pressure regulating valve, they installed the safety valve and plug of the group of valves in the opposite direction.

2：改造挖掘機加長臂后，整車慢、乏力

2: After retrofitting the excavator with extended arms, the entire vehicle is slow and lacks power

設備體現剛拆換了先導油閥封，但拆換后工作中了十幾分鐘一直很一切正常，隨后忽然就不行。依據此狀況，先猜疑先導壓力不夠。經檢測先導壓力極低，決策溶解先導泵。***發覺先導泵鍵入軸的骨架密封已擠壓，此緣故有二種：一是安裝問題，二是此處壓力過高。再次溶解發覺先導泵的密封圈方位安反。這里才算是故障的真正的緣故，當剛開始運行時，骨架密封沒有徹底毀壞，仍可常規工作中，因骨架密封只有承擔低電壓，故密封圈迅速毀壞，造成先導壓力油從毀壞處泄出。

The equipment showed that the pilot oil valve seal had just been removed and replaced, but after the removal and replacement, it worked for more than ten minutes and everything remained normal. Then suddenly, it didn't work. Based on this situation, first suspect that the pilot pressure is insufficient. After testing, the pilot pressure was found to be extremely low, and the decision was made to dissolve the pilot pump. The first thing I noticed was that the skeleton seal of the input shaft of the pilot pump had been squeezed. There are two reasons for this: installation issues and high pressure at this location. Dissolve again and find that the sealing ring of the pilot pump is in the wrong direction. This is the true cause of the malfunction. When it first started running, the skeleton seal was not completely damaged and could still function normally. As the skeleton seal only bears low voltage, the sealing ring quickly broke, causing pilot pressure oil to leak out from the damaged area.

3：改造挖掘機加長臂后，汽車發動機啟動后斗桿液壓缸的活塞桿全自動縮回去，其他姿勢一切正常。

3: After retrofitting the excavator and extending the arm, the piston rod of the hydraulic cylinder on the stick automatically retracts when the car engine is started, and everything else is normal.

經查驗，一其他姿勢一切正常；二提到動臂后斗桿下移較快?；Q斗桿先導管后故障依然，表明故障在調壓閥或斗桿液壓缸，本著有的放矢的標準。拆檢操縱閥座，發覺閥座卡在液壓缸縮回去部位，用塑膠螂頭和銅棒振動后取下閥座。由此可見有閃耀鐵末，聯絡斗桿下移較快。分辨故障根本原因為挖掘機加長臂斗桿缸套挫傷，拆檢斗桿液壓缸后確認。

Upon inspection, all other postures were found to be normal; When it comes to the boom, the stick moves down quickly. If the malfunction persists after exchanging the pipe for the stick, it indicates that the malfunction is in the pressure regulating valve or the stick hydraulic cylinder, in accordance with targeted standards. After disassembling and inspecting the valve seat, it was found that the valve seat was stuck in the retracted part of the hydraulic cylinder. After vibrating with a plastic head and a copper rod, the valve seat was removed. From this, it can be seen that there is shining iron powder, and the connecting rod moves down quickly. The root cause of the malfunction was identified as a contusion on the cylinder liner of the excavator's extended arm bucket rod. After disassembling and inspecting the hydraulic cylinder of the bucket rod, it was confirmed.

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This article is dedicated to the friendship of the extended arm excavator. For more related knowledge, please click on http://www.scinice.com Sincere attitude. We will provide you with comprehensive service. We will gradually contribute more relevant knowledge to everyone. Stay tuned