Bell Gossett Bg 118723 Spring Type Coupler LD-3 HD-3

Product Description

The BELL GOSSETT BG 118723 is a spring-type coupler designed for use in hydronic heating pump systems. Measuring 0.5 inches by 0.5 inches, this coupler transfers rotational force between the motor shaft and pump shaft while allowing for minor misalignment. It is a direct-replacement component installed by licensed plumbers and HVAC technicians during pump service or motor changeouts. The spring-type design absorbs vibration and reduces shock load on both the motor and pump assembly, making it a practical choice for maintaining reliable system operation in heating applications.

This coupler is rated for heating applications and fits the 2.5-inch pump series as well as LD-3, HD-3, HLD-3, and HHD-3 series pumps from Bell Gossett. It is commonly installed in residential and light commercial hydronic heating systems, including hot-water boiler loops and terminal unit circulation systems. Technicians typically encounter this part during pump rebuilds, motor replacements, or vibration diagnostics.

Key Features

• Spring-type design absorbs vibration and accommodates minor shaft misalignment
• 0.5-inch by 0.5-inch bore dimensions for correct shaft fitment
• Rated for heating system applications
• Compatible with multiple Bell Gossett pump series including LD-3 and HD-3
• Direct OEM replacement part for serviceability in the field

Compatibility

Designed for use with Bell Gossett 2.5-inch Series Pumps, LD-3 Series Pumps, HD-3 Series Pumps, HLD-3 Series Pumps, and HHD-3 Series Pumps (obsolete).

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber. Shut down and lock out the pump motor before removing or installing the coupler. Inspect both the motor shaft and pump shaft for wear or corrosion before seating the new coupler. Ensure shaft engagement is correct and the coupler is fully seated before restoring power to the system.

Technical Specifications

• Type: Spring Type Coupler
• Bore Size: 0.5 inches x 0.5 inches
• Application: Heating
• Compatible Pump Series: 2.5 inches, LD-3, HD-3, HLD-3, HHD-3

Standard Information

• Brand: BELL GOSSETT
• Manufacturer Part Number: BG 118723