How to change oil of Roots vacuum pump

Under normal working conditions, the pump oil of Roots vacuum pump will only be loaded under the condition of natural wear of bearing and gear transmission. The EVP vacuum pump manufacturer recommends a secondary oil change after approximately 500 hours to remove any metal particles that may be generated during operation. Otherwise, the oil must be changed every 3000 hours.

It is necessary to change the oil more frequently when extracting dust containing gases or other contaminants.

If roots vacuum pump must be operated at high temperature, the oil in the seal ring cavity should also be changed every time the oil is changed. We recommend using special vacuum pump oil.

Under “dirty” operating conditions, dust deposits may form a “shell” in the roots vacuum pump chamber. Some of these pollutants will be deposited in the suction chamber, and some of them will be deposited on the impeller of Roots vacuum pump. Once the two connecting lines are separated, they may be removed, either blow out roots vacuum pump with dry compressed air or flush with suitable cleaning agent, such as oil ether (volatile oil). After cleaning, the oil in Roots vacuum pump must be replaced. During the cleaning process, the rotor can only be turned manually. Due to the high-speed operation of the motor, the sediment falling off the surface may damage the pump. The dirt that is not easy to remove can be removed by wire brush, metal brush or scraper.

There may be no residual sediment in the roots vacuum pump chamber. After cleaning, slowly rotate the impeller manually to check whether there is resistance to rotation, and check the operability of Roots vacuum pump. Generally speaking, it is not necessary to disassemble roots vacuum pump.

If there is too much sediment, we suggest that it should be handled by professional technicians.