Lochinvar & A.O. Smith 100327308 Coupler

The Lochinvar & A.O. Smith 100327308 Coupler is a precision-engineered 3J 1/2 X 5/8 mechanical linkage designed for high-demand HVAC pump repair and fluid management systems. As a direct replacement for ARM1008, this component ensures a secure interface between the motor and pump shafts, facilitating efficient torque transmission while maintaining critical shaft alignment. Built to withstand the rigorous duty cycles of commercial industrial pump maintenance, this elastomeric coupler effectively dampens vibrations and compensates for minor angular or parallel misalignments that can lead to premature bearing wear.

For technicians performing a circulator pump service, the 100327308 offers a drop-in fit for compatible Lochinvar boilers and A.O. Smith water heaters, reducing labor time during emergency mechanical seal replacement or motor swaps. Its robust construction is tailored for hydronic heating systems, ensuring long-term reliability in high-temperature environments. Integrating this OEM replacement part is essential for contractors prioritizing system uptime and peak HVAC energy efficiency. Utilizing the correct 3J size coupling prevents overhung moments and protects the drive-train integrity of your centrifugal pump assembly.

• Direct Cross-Reference: Serves as the official replacement for ARM1008, ensuring full architectural compatibility with existing pump brackets and housings.
• Optimized Power Transfer: The 3J 1/2 X 5/8 dimensions provide a tight-tolerance fit for 1/2" and 5/8" shafts, maximizing rotational torque.
• System Protection: Engineered to absorb shock loads and reduce HVAC system harmonics, which prevents localized stress on pump impellers and motor windings.
• Durable Material Composition: Resistant to thermal expansion and common HVAC chemicals, maintaining structural rigidity under varying pressure conditions.

• Is this coupler compatible with Armstrong pumps? Yes, since it is the direct replacement for ARM1008, it is commonly used in Armstrong and similar circulator assemblies.
• Can this be used for shafts other than 1/2" and 5/8"? No, this pump coupler is specifically machined for a 1/2 inch to 5/8 inch transition; using incorrect sizing will cause equipment vibration and shaft damage.
• What tools are required for installation? Standard HVAC hand tools, including Allen wrenches for set screws, are typically required to secure the 3J coupler to the motor and pump shafts.

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.