High-temperature gear pump is a positive displacement pump, work rely on the main, driven gear changes caused by the work volume changes to transport the melt. Working volume by the pump body, gear tooth groove and the function of the side plate with the composition. Common faults and countermeasures of high-temperature gear pump are as follows: (1) Symptom: the pump can not discharge the cause of the malfunction: a, the opposite direction of rotation; b, suction or discharge valve is closed; c, inlet without material or pressure is too low; 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, , The inflow is not enough, (2) Symptom: insufficient pump flow Fault causes: a, suction or discharge valve is closed; b, the inlet pressure is low; c, the outlet pipeline is blocked; d, packing box leak; e, a, confirm the valve is closed; b, check the valve is open; c, to confirm the discharge is normal; d, tighten; a large number of leaks affect production, should stop running, disassembly inspection; 3) Symptom: abnormal sound failure reasons: a, 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 Positive or filling grease; b Check the motor; c, check the bearings and gears; d, check the shaft seal; e, check the disintegration of parking (4) Symptom: current is too large Fault causes: a, outlet pressure is too high; b, melt viscosity is too large c, The shaft seal assembly bad; d, shaft or bearing wear; e, motor failure measures: a, check the downstream equipment and pipelines; b, viscosity test; c, check the shaft seal, appropriate adjustments; d, after the parking check, Is too heavy; e, check the motor (5) Symptom: Pump suddenly stopped Fault causes: a, power failure; b, motor overload protection; c, coupling damage; d, the outlet pressure is too high, interlocking reaction; Pump bite abnormalities; f, shaft and bearing adhesion stuck measures: a, check the power; b, check the motor; c, open the safety cover, disk car inspection; d, check the instrument interlock system; Reversed car confirmation; f, car confirmation