Caterpillar original Diesel Engine Fuel Injector 10R-3266 for Caterpillar C15 C18 C27 C32 C17, Replacement for OEM 20R-2285, Cross Reference 10R1273 249-0709, fits AD30 AD55B original new injector

The Caterpillar 10R-3266 (also formatted as 10R3266) is a diesel fuel injector assembly engineered for heavy-duty Caterpillar high-pressure fuel injection systems. As a Cat-branded fuel system component, it follows Caterpillar’s design requirements to deliver precise fuel quantities at exact timing intervals, supporting consistent engine performance and reliable operation across demanding industrial work conditions. It is primarily cataloged for C15/C-15 diesel engine platforms, with widespread recognition across global industrial and aftermarket parts databases.

Aftermarket parts listings commonly associate the 10R-3266 injector with related CAT engine platforms including C16, C18, and select C27 configurations, as well as heavy equipment models such as AD30, AD55B, R2900G, R3000H, D10N, D10R, D10T, and select 773F, 773G, 775F, 775G, 990H, 844H units. These references support catalog and search matching only; final fitment is not guaranteed by engine model alone, as fuel system setups vary by engine serial number, emissions tier, machine configuration, and electronic control calibration.

The injector is available in multiple supply formats including remanufactured, new aftermarket, OEM replacement, and rebuilt exchange units to suit diverse operational needs and budget constraints. It serves as a standard replacement part for truck fleets, mining operators, construction repair teams, diesel engine rebuilders, and parts distributors. Buyers must confirm compatibility via engine serial number, machine serial number, and the original injector part number removed from the equipment before purchase.