Caterpillar original Caterpillar 317-5278 fuel injector 317-5278 replacement for OEM C9 C7 diesel engine common rail original new injector

The Caterpillar CAT C12 C10 3176C 3196 Diesel Fuel Injector 317-5278 / 20R-0055 is a precision-engineered electronic unit injector designed for heavy-duty Caterpillar diesel engines. It delivers precise fuel metering, correct spray pattern, and reliable atomization, helping restore original engine performance in motor graders, wheel loaders, compactors, track-type tractors, pipelayers, industrial engines, generator sets, and excavator applications powered by C10, C12, 3176C, and 3196 platforms. The injector is remanufactured or produced as a replacement unit to meet demanding operating conditions and is quality-tested before shipment.

This injector supports multiple OE and cross-reference numbers including CA3175278, CA20R0055, 208-9160, 170-5240, 350-7555, 707213AT, 10R-0963, 153-7923, 10R-1264, 23670-E0510, 3176C, 9X-7317, 119-8784, 215-3198, 4P-1659, and 109-5319, allowing wide search compatibility for distributors, workshops, and engine rebuilders. Engine serial number and original injector number verification are recommended prior to purchase to avoid incorrect injector selection and ensure proper fitment for specific Caterpillar C12, C10, 3176C, and 3196 applications.

Built with heavy-duty construction and export-ready sealed anti-rust packaging, the 317-5278 / 20R-0055 EUI injector helps reduce engine downtime, improve repair accuracy, and maintain consistent fuel system performance. For optimal service life, use clean diesel fuel, replace fuel filters on schedule, drain the water separator, keep fuel lines clean, and test injector flow and leakage when symptoms such as hard starting, rough idle, black or white smoke, misfire, low power, high fuel consumption, or excessive return fuel appear.