(1) Insufficient pressure or no pressure in the hydraulic system of mixing machinery: when the hydraulic pump can not pump out pressure or the pressure is insufficient, it is mostly caused by the wrong steering of the hydraulic pump or the low speed of the pump. At this time, it is necessary to change the steering of the hydraulic pump or detect whether the transmission system of the hydraulic pump is normal. When the viscosity of the hydraulic oil decreases, the volumetric efficiency of the whole system will decrease. At this time, the hydraulic oil should be replaced to ensure that its viscosity meets the requirements of the system.

(2)攪拌機械液壓系統流量小、不出油：液壓泵如果正常的旋轉但是沒有液壓油輸出時，一般是因為油箱內油量較少、吸油濾油器或者是吸油箱發生堵塞、吸油管內有壓縮空氣、液壓油黏度太高、油泵不能正常吸油等原因造成的。發生上述故障現象時，應該適當的加油，同時清洗油路。

(2) Mixing machinery hydraulic system flow is small, no oil: if the hydraulic pump rotates normally, but there is no hydraulic oil output, it is generally caused by less oil in the oil tank, oil suction filter or oil suction tank blockage, compressed air in the oil suction pipe, too high viscosity of hydraulic oil, oil pump can not normally absorb oil and other reasons. In case of the above faults, oil should be added properly and the oil circuit should be cleaned at the same time.

(3)攪拌機械液壓系統流量脈動、壓力波動：攪拌機的液壓系統出現脈動或者壓力不平衡的現象時，有可能是因為系統內吸入了空氣造成的。此時需要及時的檢查油箱，保證液壓油內沒有泡沫，如果出現泡沫，則應該及時地清洗油路，更換液壓油，同時保證整個油路內沒有漏氣發生間。

(3) Flow pulsation and pressure fluctuation of hydraulic system of mixing machine: when pulsation or pressure imbalance occurs in the hydraulic system of mixer, it may be caused by air inhalation in the system. At this time, we need to check the fuel tank in time to ensure that there is no foam in the hydraulic fluid. If there is a bubble, we should clean the oil well in time, replace the hydraulic oil, and ensure that there is no leakage in the whole oil circuit.

(4)攪拌機械液壓系統運作時噪音嚴重：攪拌機械的液壓系統出現噪音說明，液壓系統的管道、油泵等硬件，存在空氣、空吸等問題。及時查看攪拌機械油箱，是否油量超出范圍、液壓硬件與系統連接頭的密封。適量減少增、加油液保持在油箱內的規定刻度內、檢查各個密封部件的損耗程度、清理吸油過濾器或吸油管的異物、調整液壓油油泵的轉速、更換液壓油、預熱處理等方案進行保養與維護。

(4) Mixing machinery hydraulic system operation noise is serious: mixing machinery hydraulic system noise, hydraulic system pipeline, oil pump and other hardware, there are air, air suction and other problems. Timely check the mixing machine oil tank, whether the oil volume is out of range, and the sealing of hydraulic hardware and system connector. It is necessary to reduce the amount of oil, keep the oil in the specified scale of the oil tank, check the loss degree of each sealing part, clean the foreign matters in the oil suction filter or oil suction pipe, adjust the speed of the hydraulic oil pump, replace the hydraulic oil, and preheat the oil.

(5)攪拌機械液壓系統操作閥跳動：當使用油液時間過長、受污染時，油泵與控制閥硬件內的污物會大量堆積，使液壓系統運作效率大大降低，造成液壓硬件損壞、滑閥回味彈簧形變等問題。要及時檢查、更換其元件，避免在路橋施工中，發生攪拌機械液壓系統操作閥跳動的問題而影響作業安全。

(5) The operation valve of the hydraulic system of the mixing machine jumps: when the oil is used for a long time and polluted, a large amount of dirt will accumulate in the hardware of the oil pump and control valve, which greatly reduces the operation efficiency of the hydraulic system, and causes damage to the hydraulic hardware, aftertaste of the slide valve, spring deformation and other problems. It is necessary to check and replace its components in time, so as to avoid the problem that the operation valve of the hydraulic system of the mixing machine jumps during the road and bridge construction, which will affect the operation safety.

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