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Screw pump why there will be difficult to start 1, Screw pump is not filled before the pump is filled with medium or pump for a long time did not start running Remedy: The pump sucked into the room filled with media, and turn the pump shaft number 2, the pump media coagulation rule out Method: heat pump to reduce medium viscosity 3, the rubber stator and the rotor with excessive interference Remove: Replace the appropriate parts of the interference 4, the shaft seal packing too tight Exclusion: Adjust the packing gland elastic 5, the input voltage too Low elimination method: start after adjusting the voltage is normal 6, starting torque is too large Exclusion method: check and adjust the outlet valve or hand and tool to rotate the pump shaft or increase the power of the power source.