BELL AND GOSSETT 118675 Impeller Steel 4.25 in

BELL & GOSSETT 118675 Steel Impeller

This steel impeller is a direct replacement component for Bell & Gossett HD-3 series in-line circulating pumps. It fits systems where the original manufacturer model number is 102226 or the Grainger cross-reference is 4RD02. Mechanical contractors and facility maintenance teams use it to restore hydronic circulation without replacing the entire pump assembly. The overall diameter measures 4.25 in and the construction material is steel.

Sustained operation in hydronic loops

Under continuous duty the steel blades resist erosion from treated water and maintain consistent hydraulic output across the heating season. The impeller is designed for the flow path of the HD-3 pump casing, so hydraulic performance remains stable as long as the pump bearings and seals are serviceable. No electronic control or variable-speed logic is involved; the part simply transmits motor torque to the fluid. System balance and water chemistry determine the actual service interval.

Straightforward drop-in replacement

Installation consists of isolating the pump, removing the volute, sliding the old impeller off the shaft and pressing the new one into place using the existing keyway or set-screw arrangement. The most common issue is discovering a worn shaft sleeve or scored seal faces once the pump is open, which then requires additional parts not included with the impeller. Correct alignment during reassembly prevents vibration and premature bearing wear. No special tools beyond standard mechanic's hand tools are typically needed.