Common faults and countermeasures for high-pressure gear pump operation are as follows:
(1) Fault phenomenon: high pressure gear pump stops suddenly
   cause of issue:
a , power outage;
b , motor overload protection;
c , the coupling is damaged;
d , the outlet pressure is too high, interlocking reaction;
e , the pump bite abnormal;
f , the shaft and the bearing stick and stick.
   Responses:
a , check the power supply;
b , check the motor;
c , open the safety cover, check the car;
d , check the instrument interlock system;
e , after parking, positive reversal confirmation;
f , confirm the car.
(2) Fault phenomenon: abnormal sound when the high-pressure gear pump is running
   cause of issue:
a , the coupling is eccentric or poorly lubricated
b , motor failure;
c , the gearbox is abnormal;
d , poor installation of the shaft seal;
e , the shaft is deformed or worn.
   Responses:
a , align or fill the grease;
b , check the motor;
c , check bearings and gears;
d , check the shaft seal;
e , parking disassembly check.
(3) Fault phenomenon: high pressure gear pump can not discharge
   cause of issue:
a , the direction of rotation is opposite;
b , the suction or discharge valve is closed;
c , the inlet is not material or the pressure is too low;
d , the viscosity is too high, the high pressure gear pump can not bite.
   Responses:
a , confirm the direction of rotation;
b , confirm whether the valve is closed;
c , check the valve and pressure gauge;
d . Check the viscosity of the liquid. If the flow rate is proportional to the speed at low speed, if there is flow, the flow will be insufficient.
(4) Fault phenomenon: insufficient flow of high pressure gear pump
   The cause of the failure: a , the suction or discharge valve is closed; b , the inlet pressure is low; c , the outlet line is blocked; d , the stuffing box leaks; e , the speed is too low.
   Countermeasures: a , confirm whether the valve is closed; b , check whether the valve is open; c , confirm whether the discharge is normal; d , tightening; when a large number of leaks affect production, stop operation, disassembly inspection; e , check the actual pump shaft Rotating speed.
(5) Fault phenomenon: high voltage gear pump current is too large
   The cause of the failure: a , the outlet pressure is too high; b , the melt viscosity is too large; c , the shaft package is poorly fitted; d , the shaft or bearing is worn; e , the motor is faulty.
   Countermeasures: a , check downstream equipment and pipelines; b , check viscosity; c , check shaft seals, adjust properly; d , check after parking, whether the hand truck is too heavy; e , check the motor.
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