Pump does not operate.

  • Evenly loosen the stator bolts to reduce pressure. 
  • If the pump still does not operate when bolts are loose, engage the jacking screw (JS) to further open the stator sleeve. 
  • This should reduce pressure enough to allow the pump to run. 
  • Once running, re-tighten the stator bolts to achieve appropriate pump pressure.



  • Turn power disconnect switch to OFF and wait one minute for VFD to reset. 
  • See “VFD overload fault,” for possible causes.
  • Clean or replace the hose or applicator.


  • Clean or replace the pump assembly.