Q1: What caused the low pressure of the gear pump?

(1) The pressure gauge switch is not fully opened;

(2) The pressure of the safety valve is lowered;

(3) The branch pipe valve is open;

(4) The temperature of the oil is too high, the viscosity is low, and the pipe resistance is small;

(5) Air leakage in the pipeline.

Q2: How should the gear pump pressure be low?

(1) Turn on the pressure gauge switch;

(2) Readjust the pressure of the safety valve;

(3) Close the branch pipe valve;

(4) Reduce oil temperature and increase viscosity;

(5) Check the pipeline at the suction end to find out the leak and repair it.

Q3: What are the reasons for the oil leakage of the gear pump mechanical seal?

(1) The shaft seal is not adjusted well;

(2) "O" type sealing ring is damaged;

(3) The static ring and the moving ring of the mechanical seal are damaged or have defects such as burrs and scratches;

(4) The spring is loose.

Q4: How to eliminate the oil leakage of the gear pump mechanical seal?

(1) Readjust the mechanical seal and tighten the end cover bolts;

(2) Replace the "O"-shaped sealing ring;

(3) Replace the dynamic and static rings or re-grind;

(4) Replace the spring.

Q5: What should I do if the gear pump does not discharge oil or the oil discharge is small?

(1) Adjust the direction of rotation;

(2) Open the valve;

(3) Check the oil suction pipe and dip it into the oil surface;

(4) Measure the pressure at the suction end to increase the suction surface;

(5) Remove and replace the filter to increase the area of the filter screen;

(6) Check the joints, it is best to use sealing materials to seal;

(7) Disassemble the safety valve for cleaning, and grind it with fine abrasive paste to seal it;

(8) Preheat the liquid. If it cannot be preheated, lower the discharge pressure or reduce the oil discharge.

Q6: What are the reasons why the gear pump does not discharge oil or the oil discharge is small?

(1) The direction of rotation is reversed;

(2) The valve is closed;

(3) The suction pipe is not immersed in the oil;

(4) The suction height is too high and exceeds the rated value;

(5) The screen area of the filter is too small;

(6) Air leakage in the suction pipe;

(7) The safety valve is stuck or has poor sealing;

(8) The temperature of the liquid is low and the viscosity increases.

Q7: What are the reasons for abnormal noise and vibration during the operation of the gear pump?

(1) Improper assembly;

(2) The pump shaft is not concentric with the motor shaft, and the shaft is bent;

(3) The suction pipe or the oil filter is blocked;

(4) The diameter of the suction pipe is too long, and the resistance is too large to suck;

(5) The resistance of the drain pipe is too large;

(6) Air leakage;

(7) The fastener is loose;

(8) The sides of the gear and the bearing seat are severely worn or seized.

Q8: How to deal with abnormal noise and vibration during operation?

(1) Overhaul and adjust errors in the assembly process;

(2) Readjust the concentricity of the pump shaft and the motor;

(3) Remove blockages in pipelines and oil filters;

(4) Readjust the diameter of the suction pipe;

(5) Check whether the drain pipe and valve are blocked;

(6) Check the leaking parts;

(7) Check to tighten the bolts of loose parts;

(8) Remove for repair or update.

Q9: What is the reason why the safety valve does not work (failure)?

(1) The position is reversed;

(2) The pressure is adjusted too high;

(3) The safety valve core is stuck.

Q10: What to do if the safety valve does not work (failure)?

(1) Install the safety valve correctly;

(2) Lower the pressure;

(3) Disassemble and clean the safety valve core, and readjust the discharge pressure.