Cummins 3918776 Crankshaft Gear

The Cummins 3918776 crankshaft gear is a critical timing drive component engineered for the 8.3-liter 6C series diesel engines. Manufactured from high-strength alloy steel via precision casting, this gear features a 42-tooth helical profile designed to mesh directly with the crankshaft (part number 3918986) and camshaft or idler gears to maintain valve timing integrity. It serves as a direct replacement for OEM part numbers 3918776, 3901375, 3907645, and 3918380. The component is applicable across the 6CT, 6CTA, 6CTAA, ISC, QSC, QSL, and ISL engine families used in construction machinery, industrial equipment, and commercial vehicles. Material composition and heat treatment processes comply with Cummins engineering standards for wear resistance and fatigue strength under heavy-duty cyclic loading.