The pump is installed after the unloading disc does not move after the pump impeller wear is how the situation found
Impeller end bearing or bushing damage; 2 impeller end axis bending; 3 impeller loose or not installed in place
Is the pump shell and impeller clearance is too small, you should add a ring of paper pad on the pump well, in your bearings are not installed in place, these two reasons
4. Impeller change; 5. Channeling; 6. Pump shell mouth occlusion [partial load].
