① If the gland is not installed properly, it cannot be pressed tightly: for example, the gland is installed with deviation, the force of the fastening screw is uneven, the fastening screw is too long, etc. The screws shall be tightened in diagonal sequence, the force shall be uniform when tightening the screws, and the screw length shall be reasonably selected according to the depth of the screw hole.

②査密封件質量是否有問題：當反復更換新密封圈均不了 漏油問題時可能屬于這種情況。此時應確認密封圈是否購自非正規廠家的產品，密封材質尺寸是否有問題密封件是否保管不善自然老化 變質。

② Check whether there is any problem with the quality of the seal: this may be the case when repeatedly replacing the new seal ring can not solve the oil leakage problem. At this time, it should be confirmed whether the sealing ring is purchased from informal manufacturers, whether there is a problem with the sealing material and size, and whether the seal is not well kept and naturally aged.

③查密封部位的加工質量是否符合要求：如溝槽尺寸及精度不 符合要求、密封表面粗糙、未倒角等，應按有關標準設計加工溝槽尺寸，不符合要求的要修正到要求的尺寸，修正并去毛刺。

③ Check whether the processing quality of the sealing part meets the requirements: if the groove size and accuracy do not meet the requirements, the sealing surface is rough, not chamfered, etc., the groove size shall be designed and processed according to relevant standards. If it does not meet the requirements, it shall be corrected to the required size, corrected and deburred.

④查自上料水泥攪拌車液壓缸密封件的使用條件：如油不清潔、黏度過低、油溫過高、周圍環境溫度太高等，分別采取更換適宜的干凈油液、査明溫升原因，采取隔熱、設置油冷卻裝置等措施。

④ Check the service conditions of hydraulic cylinder seals of self feeding cement mixer truck: if the oil is not clean, the viscosity is too low, the oil temperature is too high, and the ambient temperature is too high, replace the appropriate clean oil, find out the cause of temperature rise, and take measures such as heat insulation and oil cooling device.

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