Cummins 3689465 Idler Pulley Assembly

The Cummins 3689465 idler pulley is a critical component in the accessory belt drive system of EPA13 compliant 15-liter ISX, ISX15, QSX15, and X15 diesel engines. It maintains proper belt tension and alignment for the XPI fuel system drive, reducing wear on belts and bearings. The pulley features a 6-rib groove profile with an integrated dust shield to protect the bearing from contamination in harsh engine compartment environments. Constructed with a durable metal housing and precision bearing, it is engineered to withstand high thermal and mechanical loads typical of heavy-duty commercial vehicle operation. This genuine OEM pulley replaces Cummins part numbers 3682229 and 180943, and cross-references to aftermarket numbers 36223, 89120 (Gates), and S-23813.