Caterpillar original 10R-7221 Fuel Injector for C7 C9 Engine 330D 336D Excavator Replacement for OEM 387-9436 328-2574 268-1835 new injector original new injector

The Caterpillar C9 fuel injector, OE number 10R-7221 and cross reference 326-0675, is engineered to deliver OEM-level performance for the full range of CAT C9 engine platforms, including C9 ACERT, C9.3, C9.4, marine variants, and generator drive configurations. Built with CNC-machined components and controlled to micron-level tolerances, each unit is calibrated against original equipment standards to ensure stable injection timing and accurate fuel metering across varying load conditions. Every injector is 100% flow tested before shipment, providing direct-fit compatibility without the need for recalibration or additional programming.

Durability is central to the design of the 10R-7221 injector. Heat-resistant alloy materials, corrosion-resistant surface coatings, and wear-resistant internal components work together to extend service life in demanding environments such as construction sites, open-pit mining operations, offshore marine applications, and continuous-duty generator sets. The common rail electronic unit injection system supports improved fuel efficiency, reduced exhaust smoke, lower fuel consumption, and enhanced power output, while contributing to lower long-term maintenance costs and more stable engine performance under heavy-duty operating cycles.

This injector is compatible with a wide spectrum of Caterpillar equipment, including excavators such as the 330D, 336D, 345D, 349D, 365C, and 374D, wheel loaders including the 950H, 962H, 966H, 972H, and 980H, motor graders such as the 140M, 160M, 12M, 14M, and 16M, as well as CAT C9 generator sets, Olympian generator units, marine power systems, and various industrial power units. Recommended service intervals range from 2,000 to 4,000 operating hours, supported by routine fuel filter replacement, use of ultra-clean diesel, inspection of fuel lines, injector balance testing, and monitoring of correction values to maintain consistent combustion quality throughout the component lifecycle.