長臂挖掘機

省時 省力 省財富

很多人反映在更換完控製閥總成的密封後即出現此故障。測後泵收鏟鬥時的壓力為1.5Mpa，遠小於正常值的28.5Mpa。在準備交換兩路的安.全閥時，發現故障一側的位置上為一堵頭而原堵頭的位置卻安裝了安.全閥。交換正確位置後機器正常。原來維修人員更換完控製閥總成的密封後，將該組閥的閥門與堵頭位置裝反。

Many people have reported that this fault occurred after replacing the seal of the control valve assembly. The pressure when the pump collects the bucket after measurement is 1.5Mpa, which is much lower than the normal value of 28.5Mpa. When preparing to exchange two safety valves, it was found that there was a plug on the faulty side, but the original plug was installed with a safety valve. After swapping the correct position, the machine is functioning normally. After the maintenance personnel replaced the seal of the control valve assembly, they installed the valve and plug position of the group of valves in the opposite direction.

改裝成挖掘機加長臂後，全車慢、無力

After being modified into an excavator with extended arms, the entire vehicle is slow and powerless

有人反映剛更換了先導泵油封，但更換後工作了十幾分鍾一直很正常，然後突然就不行了。根據此情況，懷疑先導壓力不足。經測試挖掘機加長臂的先導壓力非常低，決定分解先導泵。

Someone reported that the pilot pump oil seal had just been replaced, but it worked normally for more than ten minutes after the replacement, and then suddenly stopped working. Based on this situation, it is first suspected that the pilot pressure is insufficient. After testing, the pilot pressure of the excavator's extended arm was very low, and it was decided to disassemble the pilot pump.

發現先導泵輸入軸的骨架油封已擠出，此原因有兩種：一是安裝問題，二是該處壓力過高。繼續分解發現先導泵的油封方向裝反。此處才是故障的原因，當剛開始工作時，骨架油封沒有完全損壞，仍可正常工作，因骨架油封隻能承受低壓，故油封很快損壞，導致先導壓力油從損壞處泄出。

It was found that the skeleton oil seal of the input shaft of the pilot pump has been squeezed out. There are two reasons for this: installation problems and high pressure at that location. Further disassembly revealed that the oil seal of the pilot pump was installed in the opposite direction. This is the cause of the malfunction. At the beginning of work, the skeleton oil seal was not completely damaged and can still function normally. As the skeleton oil seal can only withstand low pressure, it quickly damaged, causing pilot pressure oil to leak out from the damaged area.

發動機起動後鬥杆油缸的活塞杆自動縮回

The piston rod of the stick cylinder automatically retracts after the engine starts

經檢查，一其餘動作正常;二提起動臂後鬥杆下沉較快。交換鬥杆先導管後故障依舊，說明故障在控製閥或鬥杆油缸，本著先易後難的原則。拆檢控製閥杆，發現閥杆卡在活塞杆縮回位置，用橡膠螂頭和銅棒震動後取出閥杆。可見有閃亮鐵末，聯係鬥杆下沉較快。判斷故障根源為挖掘機加長臂鬥杆缸筒拉傷，拆檢鬥杆油缸後證實。

After inspection, all other actions were normal; After lifting the boom, the stick sinks quickly. If the malfunction still persists after exchanging the handle, it indicates that the malfunction is in the control valve or handle oil cylinder, following the principle of easy first and difficult later. After disassembling and inspecting the control valve stem, it was found that the valve stem was stuck in the retracted position of the piston rod. After vibration with a rubber cock and a copper rod, the valve stem was removed. There is visible shiny iron powder, indicating that the bucket handle sinks quickly. The root cause of the malfunction was determined to be a pulled cylinder on the extended arm of the excavator, and it was confirmed after disassembling and inspecting the cylinder.