1 SZ-type vacuum pump maintenance safety precautions 1) Do not loosen or tighten the pressure in the operation of the bolts and other accessories. 2) Do not wipe or overhaul the rotating part of the pump during operation. 3) During the operation of the pump, the operator should check the operation status frequently. If abnormality is found, it should be stopped immediately and can be overhauled until the pressure drops to zero. 2 SZ vacuum pump maintenance safety precautions 1) before maintenance, close the import and export valves, plus plug the blind and the system isolated. Cut off the power, hang up the "forbidden card" sign, handle the handover procedures, before overhauling. 2) maintenance equipment, should be strictly observed in this type of work safety practices. 3) Maintenance equipment disassembly and assembly should be carried out in sequence, and try to use special tools. 4) assembly and disassembly of equipment components, should avoid hard knock, so as not to damage the mating surface.