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3 The vacuum pump does not start The vacuum pump cannot be started mainly because the vacuum pump cannot start running after being powered on. Vacuum pump maintenance should first check the circuit part of the vacuum pump, such as whether the fuse is burnt, and whether the circuit part has any vital components burned out. After troubleshooting the circuit part, the following two factors should be considered: (1) The motor is burnt out. The main reason is that the stator coil of the motor is burned, which causes many reasons, such as excessive instantaneous current, wear of the motor bearing after a long time of use, resulting in increased frictional resistance of the bearing, increased motor power, and increased temperature, resulting in motor burnout. At this time, the motor bearing should be checked first, and then the motor coil should be checked. When the bearing is damaged, replace the bearing; when the motor coil is burnt, the motor should be repaired and the stator coil should be rewound. When the bearing and coil are seriously damaged, the motor should be replaced. (2) The rotary vane is blocked. The main performance is that the frictional resistance between the rotary vane and the inner surface of the pump cavity is too large, so that the motor cannot drive the rotor (rotary vane). The reason is that the rotary vane is deformed, the spring in the rotor cannot be reset after it is opened, or the resultant force of the spring pressure and the centrifugal force of the rotary vane is too large, resulting in excessive frictional resistance between the rotary vane and the inner surface of the pump cavity. At this time, the rotary vane and the spring should be repaired, and when they cannot be repaired, the two should be replaced.