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In addition to preventing dry running and overload, as well as preventing air ingestion and excessive vacuum levels, it is also necessary to: 1. If the direction of rotation of the pump changes, then its suction and discharge directions will also change. Vane pumps all have a specified direction of rotation, and reverse rotation is not allowed. Because the rotor blade slots are inclined and the blades have chamfers, the bottom of the blades is in communication with the oil discharge chamber; the throttle grooves on the oil distribution plate, as well as the inlet and outlet ports, are designed according to a predetermined orientation. Reversible vane pumps must be designed specifically. 2. Pump assembly: The oil distribution plate and stator should be properly positioned using positioning pins; the vanes, rotor, and oil distribution plate must not be installed in the wrong order. The suction area on the inner surface of the stator is the most prone to wear, and if necessary, it can be installed upside down so that the original suction area becomes a discharge area, allowing continued use. 3. During disassembly and assembly, pay attention to keeping the working surface clean; the oil used should be properly filtered. 4. If the gap between the blades in the blade grooves is too large, leakage will increase; if it is too small, the blades cannot expand and contract freely, resulting in abnormal operation. 5. The axial clearance of the vane pump has a significant impact on ηv. 1) Small pumps – 0.015～0.03 mm 2) Medium pumps – 0.02～0.045 mm 6. The temperature and viscosity of the oil should generally not exceed 55°C, with the viscosity required to be between 17～37 mm2/s. If the viscosity is too high, it is difficult to absorb oil ； If the viscosity is too low, leakage will be severe.