Gear Pump Repair
Gear Pump Repair and Maintenance
Gear Pump Repair
| Serial number | Fault phenomenon | Cause of issue | Solution |
| 1、 | Gear pump does not absorb oil | · Inhalation management circuit is blocked or leaked · The suction height exceeds the allowable suction vacuum height · Motor reverse · Medium viscosity is too high | · Overhaul the suction line · lower suction height · Change the direction of the motor · Warm up the medium |
| 2、 | Pressure gauge pointer fluctuates greatly | · Air leakage in the suction line · The safety valve is not adjusted properly or the working pressure is too large so that the safety valve is opened and closed at times. | · Check the suction line · Adjust the safety valve or reduce the working pressure |
| 3、 | Traffic drops | · Blocked or leaking suction line · Severe wear in gears and pumps · Motor speed is not enough · The safety valve spring is too loose or the disc is not in tight contact with the valve seat | · Check the suction line · Parts should be replaced when worn out · Repair or replace the motor · Adjust spring, grind disc, and seat |
| 4、 | Sharp increase in shaft power | · Blocked discharge line · Serious friction between gear and pump · The viscosity of the medium is too high | · Stop the pump to clean the pipeline · Repair or replace related parts · Heat up the medium |
| 5、 | Gear pump vibrates | · The pump and the motor are not concentric · Gear and pump are not concentric or have large · clearance · Air in the pump · If the installation height is too large, cavitation occurs in the pump | · Adjust concentricity · Maintenance adjustment · Overhaul the suction line and remove the leaking parts · Lower installation height or lower speed |
| 6、 | Gear pump heats up | · Severe friction in the pump · Mechanical seal oil return hole is blocked · Oil temperature is too high | · Check and adjust gear clearance · Clear the oil return hole · Properly lower the oil temperature |
| 7、 | A large amount of oil leaks from the mechanical seal | · Incorrect assembly position · Sealing gland not flattened · The sealing surfaces of the moving ring and the static ring are bruised · The dynamic and static ring seals are damaged | · Reinstall as required · Adjust the sealing gland · Grind the sealing surface or replace it with new parts · Replace the sealing ring |
Daily maintenance of gear pumps
- Regularly check the pump outlet pressure, overpressure operation is not allowed.
- Regularly check whether the pump fastening bolts are loose and there is no noise in the pump
- Regularly check the temperature of stuffing box, bearing and casing.
- Periodically check the shaft seal for leaks.
- Check the current regularly.
- Clean the inlet filter regularly
