3979746
Accessory Drive Belt Idler Pulley
Mack

The idler pulley is an essential component that maintains proper tension on the accessory drive belt, ensuring smooth operation of belt-driven accessories. Its high-quality bearing design reduces friction and noise, contributing to quieter engine performance. The pulley’s durable construction resists wear from constant belt contact and environmental factors, extending its service life. Proper functioning of this pulley prevents belt slippage and misalignment, which could lead to accessory failure or engine overheating. Regular inspection and replacement are recommended to sustain optimal belt tension and system efficiency. Source One Parts Center offers this idler pulley as a reliable part to support your vehicle’s accessory drive system.