(1) Gland is not installed properly, plugging the drain hole on the front cover and back cover. (2) the outer diameter of the seal with the seat hole with loose fit. (3) The direction of installation of the pump body is reversed, the pressure port connected to the unloading ditch, the formation of pressure out of the ring. (4) oil is not clean, oil is not smooth. (5) tubing thread is not tight. Gear pump seal as a gear pump an important component, plays a fixed spindle, sealing medium role. If there is leakage, first check the seal selection and installation is correct, and secondly check the condition is running smoothly. Air Purifier And Humidifier,Air Filter And Humidifier,Air Purifiers With Humidifier,Hepa Air Purifier And Humidifier Guangdong Zhengshang Electrical Technology Co., Ltd. , https://www.zengsung.com