Lochinvar & A.O. Smith 100278231 Coupler

The Lochinvar & A.O. Smith 100278231 Coupler is a precision-engineered pump coupler replacement designed for high-performance hydronic and domestic hot water systems. As a critical mechanical link between the motor and the pump assembly, this genuine OEM part ensures smooth torque transmission while compensating for minor shaft misalignments that can lead to premature bearing failure. This specific model is the direct technical replacement for the ARM1007 and 100133541 part numbers, making it compatible with a wide range of Lochinvar boilers and A.O. Smith water heaters. Built for durability in commercial and residential HVACR environments, the 100278231 coupler maintains system efficiency and prevents the vibrational stress that often causes assembly leaks. Whether you are performing routine maintenance or a critical repair, utilizing this exact-fit HVAC pump coupler ensures the structural integrity of the drive assembly and restores the unit to its original factory specifications for quieter, more reliable operation.

• Direct OEM Replacement: Seamlessly replaces ARM1007 and 100133541, ensuring 100% mechanical compatibility without modification.
• Enhanced Vibration Dampening: High-grade materials absorb operational shocks, protecting both motor and pump seals from excessive wear.
• Leak Prevention: Maintains rigid yet flexible connections to prevent pump assembly leaks caused by shaft torque imbalances.
• Industrial-Grade Build: Engineered for continuous duty cycles in high-temperature heating and water supply systems.

• Is the 100278231 compatible with Armstrong pumps? Yes, this part is the designated replacement for the Armstrong ARM1007 coupler used in many circulating pump configurations.
• What causes these couplers to fail? Most failures result from motor misalignment or prolonged exposure to high-torque starts; replacing with an OEM 100278231 ensures the correct fitment to prevent recurrence.
• Do I need special tools for installation? Standard technician hand tools are sufficient, though verifying shaft alignment during installation is recommended for maximum service life.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.