Caterpillar original Replacement Diesel Fuel Injector 10R-1275 10R-1290 for Caterpillar 3508B 3512B 3516B Engine 359-5469 250-1311 for CAT 793C 793D Mining Machinery original new injector

Built to align with Caterpillar’s exact OEM design requirements for 3500 Series heavy-duty diesel engines, the 10R-1275 Electronic Unit Injector (EUI) is a precision-manufactured fuel system component for mission-critical industrial operations. It fits a broad range of CAT engine variants including 3508B, 3512B, 3516B, 3508C, 3512C and 3516C, as well as marine and generator-specific configurations, and cross-replaces directly with 127-8222 (1278222) and reman equivalent 0R-8477 (0R8477).

Integrating high-pressure fuel generation and injection functions into one compact assembly, the 10R-1275 runs on ECM-controlled solenoid activation to drive an internal plunger, delivering finely atomized fuel through precision nozzle holes for consistent, precisely timed combustion. This design enables accurate fuel metering, improved combustion efficiency, reduced fuel consumption, lower emissions, enhanced power output and better cold-start performance, while heat-resistant, corrosion-resistant materials and OEM-calibrated flow deliver long service life and stable performance under extreme loads.

Ideal for generator sets, marine propulsion systems, mining trucks, oilfield power modules and other heavy industrial equipment, the injector ships in industrial export packaging with a 12-month warranty for B2B buyers. Following official installation guidelines (new seals, torque spec adherence, post-install balance testing) and routine maintenance rules (regular filter changes, clean diesel fuel) minimizes unplanned downtime across power generation, mining, marine and oilfield worksites.