Impeller clearance adjustment for slurry pump

Adjustment of impeller:

In order to assure the high-efficiency of the pump, check the clearance between the impeller and the front guard plate. The clearance between impeller and front guard plate of metal-lined pump should be 0.5-1mm; the clearance between the impeller and front liner should be equal to that between impeller and rear liner.

Before adjusting the clearance, the pump should be stopped first, then loosen the bolts of the bearing assembly and screw out the nut of adjusting bolts in order to make the bearing assembly move forward; at the same time, rotate the pump as per the arrow by hand until the impeller touches the front guard plate. For the metal-lined pumps, loosen the nut by half turn, then fasten the nut on the adjusting bolt to make the bearing assembly move backward, and the clearance between the impeller and front guard plate should be 0.5-1mm. For the rubber-lined pumps, adjust the nut on the adjusting bolts to make the bearing assembly move forward in order to contact with the front guard sleeve, then move the bearing assembly back to contact with the