ensuring the fan blade pitch and motor torque are perfectly synchronized

the thermal bimetal or heater coil has reached end-of-life

Engineered with a swept volume of 166

Cross-referencing technical data confirms compatibility with multiple Armstrong and Ducane furnace models as a direct OEM replacement part

The "SC" charge is designated for medium temperature ranges

Lovejoy 68514411522 Hub 30067439-890 ensuring the fan blade pitchThe Lovejoy 68514411522 is a precision engineered L100 Hub designed for high reliability power transmission in industrial HVACR and pumping systems. Constructed from high strength sintered iron, this Type L jaw coupling component is built to handle a nominal torque of 417 in lbs, making it an ideal choice for medium duty motor and drive shaft applications. This specific hub features a 1 3 8 inch finished bore with a standard 5 16" x 5 32" keyway and a