85114233
Fan Clutch With Hub Assembly
Mack

An integrated fan clutch with hub assembly governs when and how hard the engine cooling fan engages. In idle or high-temperature conditions, the clutch locks to draw maximum airflow; at cruising speeds, it disengages to reduce engine drag, improving fuel economy and reducing wear on the belt drive. The hub provides a precise mounting interface and a stable rotation path, ensuring alignment with the fan blade and shroud. This assembly is critical for maintaining consistent engine temperatures under heavy loads, stop-and-go traffic, or desert climate operations where cooling demand spikes. Properly functioning clutch assemblies minimize fan blade fatigue, reduce parasitic power loss, and extend the life of the water pump and belts. Replacement should consider fan blade compatibility, mounting torque, and proper lubrication or lubrication-free designs depending on the model. When the fan no longer responds to temperature changes or there are abnormal fan speeds, inspect the clutch springs or viscous fluid and replace as needed. Source One Parts Center can supply a reliable hub-driven cooling solution.