Moyno© Pumps are positive displacement pumps and very simple equipment. However, there are some challenges in specialized applications as well as some head scratching moments in everyday pumping with progressive cavity pumps. Moyno© Pumps are found in nearly all industries from Pulp and Paper to Waste Water Treatment Plants. This ultimate guide in troubleshooting Moyno© Pumps is intended for the initial startup, maintenance and operation, and ultimate failure of the unit. PMV Pump
is here to guide you the information you need incase you need to replace your Moyno© Pump or in assistance of Moyno© Pump Parts to get your operations back up and running again.
Moyno© Pump Troubleshooting Guide
There are may reasons a Moyno© Pump will not function from a simple start up, plant shut down, or pump failure. We will try to comprehensively cover most reasons pertinent to Moyno© Pumps and their operation. It is important to know that depending on the models a Moyno© Pump comes in many designs with different features that could impact the reasoning behind this troubleshooting guide, and for that PMV Pump
has the knowledge and personal to assist you. If you need further assistance, please contact us and we will guide you regardless of your progressive cavity pump as we work on ALL makes and models.
Moyno© Pump Will Not Start
| Cause |
Solution |
| Sedimentation inside suction housing or stator cavities |
Flush – Clean – Replace if unable to clear it. |
| Rubber adhesion between Rotor and Stator |
Remove Stator and lubricate Rotor with mild Soap |
| Fluid Temperature Too High |
Check Temperature – Use Undersize Rotor |
| Fluid Temperature Too Low |
Keep Away from Elements – Use Heater |
| Gland Packing Too Tight |
Loosen Gland Bolts – Replace Unusable Packing Rings |
| Solids or Grain too big |
Use Screen – Increase Liquid Portion – Reduce Speed |
| Stator Swollen |
Use Correct Stator Material |
Moyno© Pump Starting Problems
Moyno© Pump Does Not Create Suction
| Cause |
Solution |
| Incorrect Direction of Rotation |
Check Direction of Rotation – Swap Electric Connections |
| Shaft Seal and Inlet Pipe Leaks or Blocked |
Correct Leakage or Blockage |
| Suction Head too High |
Increase Diameter of inlet pipe – Use larger Filter |
| Viscosity too high |
Check and Modify Application |
| Pump Running Dry |
Check Product Level – Apply Dry Running Protection |
| Rotation Speed Too Low |
Pump Speed Too Low for Low Viscosity Fluid |
| Rotation Speed Too High |
Pump Speed Too High for High Viscosity Materials |
| Stator – Rotor Worn |
Replace Stator – Rotor |
| Joint Parts Worn or Damage |
Replace Worn or Damage Joint Parts |
No Suction and Moyno© Pumps
Moyno© Pump Does Not Reach Capacity
| Cause |
Solution |
| Excess Outlet Pressure |
Check piping/system to Reduce Pressure |
| Air in Discharge |
Check Inlet Pipe, Packing Gland, Increase Liquid |
| Suction Head too High |
Increase Diameter of inlet pipe – Use larger Filter |
| Stator – Rotor Worn |
Replace Stator – Rotor |
| Rotation Speed Too Low |
Pump Speed Too Low for Low Viscosity Fluid |
| Rotation Speed Too High |
Pump Speed Too High for High Viscosity Materials |
| Viscosity too high |
Check and Modify Application |
Capacity not achieve with a Moyno© Pump
Moyno© Pump Too Loud
| Cause |
Solution |
| Gland Packing Too Tight |
Loosen Gland Bolts – Replace Unusable Packing Rings |
| Suction Head too High |
Increase Diameter of inlet pipe – Use larger Filter |
| Coupling Failure |
Check and Replace if Necessary |
| Rotation Speed Too High |
Rotation Speed Too High |
| Joint Loose or Damage |
Check and Replace |
| Bearing Noise |
Replace Bearings |
Loud Moyno© Pump
Moyno© Pump Seized or Does Not Pumps
| Fluid Temperature Too High Cause |
Solution |
| Shaft Seal and Inlet Pipe Leaks or Blocked |
Correct Leakage or Blockage |
| Pressure Head too High |
Reduce head pipe or shortened |
| Pump Running Dry |
Check Product Level – Apply Dry Running Protection |
| Foreign objects in pump |
Remove Inlet and Clean Objects |
| Stator – Rotor Worn |
Replace Stator – Rotor |
| Joint Loose or Damage |
Check and Replace |
| Fluid Temperature Too High |
Check Temperature – Use Undersize Rotor |
| Fluid Temperature Too Low |
Keep Away from Elements – Use Heater |
| Solids or Grain too big |
Use Screen – Increase Liquid Portion – Reduce Speed |
| Stator Swollen |
Use Correct Stator Material |
Seized Moyno© Pump
Moyno© Pump Pumping Unevenly
| Cause |
Solution |
| Rotation Speed Too High |
Pump Speed Too High for High Viscosity Materials |
| Pump Running Dry |
Check Product Level – Apply Dry Running Protection |
| Shaft Seal and Inlet Pipe Leaks or Blocked |
Correct Leakage or Blockage |
| Pressure Head too High |
Reduce head pipe or shortened |
| Viscosity too high |
Check and Modify Application |
Uneven pumping of a Moyno© Pump