BELL AND GOSSETT 118473 Circulating Pump Coupler

BELL & GOSSETT 118473 Circulating Pump Coupler

This cast iron coupler connects compatible Bell & Gossett in-line circulating pumps to their motor shafts. It fits models including the 604S, 608S, 611T, 613S, B604S, and B611S within the Series E-60 and 60 families. Maintenance technicians and facility engineers use it to restore pump operation after coupling wear or failure.

Cast iron construction and spline-free mounting

The coupling uses a cast iron body that resists corrosion in hydronic heating and cooling loops. Because the number of splines is not applicable, the part mounts via a keyed or friction-fit interface rather than a splined connection. This design simplifies alignment during installation and reduces the risk of stripped drive surfaces over time.

Thermal stability and power transmission

Cast iron maintains dimensional stability across the temperature ranges found in typical circulating pump applications. The rigid coupling transmits motor torque directly without damping elements, so mechanical noise stays low when the pump and motor are properly aligned. Power draw reflects only the pump hydraulic load, with no additional losses from the coupling itself.