Caterpillar original  Common Rail Fuel Injector for D11R Engine, Replacement 20R-3477 250-1304 359-5469, fits 793D 5130B 5230B C3500B Excavator Truck new original new injector

Engineered for the CAT 3512B platform, the 10R-1278 fuel injector delivers precise metering within electronically controlled fuel systems, supporting stable combustion across demanding load profiles. Its multi-hole nozzle design promotes consistent fuel atomization, contributing to efficient power output and reduced exhaust residue in generator sets, marine propulsion units, and heavy-duty mining equipment. The injector is manufactured to micron-level tolerances and is protected by a corrosion-resistant surface treatment, enabling extended service life under continuous industrial operation.

Built for direct OEM compatibility, the 10R-1278 serves as a reliable replacement for Caterpillar 3512B engines, with confirmed interchange reference to 238-1498, 10R-1277, 10R-1280, and 10R-1281. It withstands high injection pressures required by V12 high-horsepower applications and maintains stable fuel delivery under fluctuating load conditions. Each unit is produced under ISO9001 quality standards, ensuring dependable performance in power generation, oilfield operations, offshore platforms, pipeline stations, and emergency backup systems.

The injector supports straightforward installation and routine maintenance, with recommended inspection intervals every 2000 and 4000 operating hours alongside major overhaul schedules. Pre-installation checks cover part number verification, seal condition, and fuel cleanliness, while post-installation procedures include torque application, fuel system bleeding, and engine testing. This combination of robust construction, OEM-grade fitment, and broad application coverage makes the 10R-1278 a practical solution for fleet operators, service workshops, and industrial power system integrators worldwide.