(1) Failure phenomenon: the pump can not discharge Fault causes: a, the opposite direction of rotation; b, suction or discharge valve is closed; c, no inlet or pressure is too low; d, viscosity is too high, the pump can not bite countermeasures: a , Confirm the direction of rotation; b, confirm the valve is closed; c, check the valve and pressure gauge; d, check the liquid viscosity, low speed operation by the speed ratio of the flow rate is there, if the flow, then the inflow, (2) Phenomenon: Insufficient pump flow Failure causes: a. Inlet or discharge valve is closed; b. Inlet pressure is low; c. Outlet line is blocked; d, Fill box leaks; e. Check the valve is open; c, to confirm the discharge volume is normal; d, tighten; a large number of leaks affect production, should stop running, disassembly inspection; e, check the actual shaft speed; : A, the coupling eccentric or poor lubrication b, motor failure; c, reducer abnormalities; d, shaft seal at the installation of bad; e, shaft deformation or wear countermeasures: a, find or fill the grease; b, check Motor; c, check the bearings and gears; d, seized Check shaft seal; e, parking disintegration inspection (4) Symptom: current is too large Fault causes: a, the outlet pressure is too high; b, melt viscosity is too large; c, shaft seal assembly bad; d, shaft or bearing wear; e, motor failure measures: a, check the downstream equipment and pipelines; b, test the viscosity; c, check the shaft seal, appropriate adjustments; d, check after parking, hand crank car is too heavy; Phenomenon: sudden stop pump failure causes: a, power failure; b, motor overload protection; c, coupling damage; d, the outlet pressure is too high, interlocking reaction; e, abnormal bite into the pump; f, shaft and bearing adhesion Stuck measures: a, check the power; b, check the motor; c, open the safety cover, disk inspection; d, check the instrument interlock system; e, after parking, reversing confirmation; f,