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Ten questions and ten answers to help you see through the failure routines of gear pumps

Date:2020/7/12 Reading:1772

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.


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