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During the use of oil vacuum pump, there are some failures due to inadequate maintenance or other problems. It is recommended to follow the following steps:

1: Cut off the power supply and remove the vacuum pump from the vacuum system;

2: Use gravity method or pressure method to discharge and collect dirty oil to avoid environmental pollution;

3: Remove the belt and pulley key (the double-stage rotary vane vacuum pump includes the belt);

4: First remove the low vacuum end, remove the rear end cover, and then take out the low vacuum rotor, rotor and spring;

5: Remove the front cover and take out the high vacuum rotor, rotor and spring;

6: Remove the mirror, exhaust valve, exhaust cover, etc;

7: Clean the removed metal parts thoroughly with gasoline and dehydrate them with alcohol. Rubber parts can be dissolved in 15% sodium hydrofluoride and boiled to remove oil. For parts with burr or rust, it can be gently ground with oilstone or metallographic sandpaper to remove rust spots and burrs. The cleaned parts must be dried;

8: During assembly, first install the second stage, hold up the spring and rotating blade and install them into the rotor, then put them into the vacuum pump chamber. Install the front end cover, and then install the positioning pin. Tighten the screws evenly and symmetrically. After assembly, the rotation should be flexible and even. After installing the front stage rotor and rear end cover, install the exhaust valve (the exhaust valve piece should be close to the valve seat) and other parts, such as air ballast device.