Caterpillar original Caterpillar 198-6877 Common Rail Fuel Injector Assembly 3412 3412E 3408 D9R 637G Replacement for OEM new injector original new injector

The Caterpillar 3412 Series Fuel Injector 198-6877 is engineered to deliver reliable fuel delivery for the demanding CAT 3412 V12 diesel platform. Designed to meet original equipment specifications, this injector operates at 2000–2500 bar with a multi-hole atomization nozzle and a 155° spray angle, ensuring precise fuel metering across the 18.1 L displacement range. It is a direct-fit replacement for OE 9W-8895, with cross-reference compatibility for 198-6877 and 184-4412, supporting the 3412, 3412 DITA, and 3412 E variants used in industrial, marine, construction, mining, and generator-set applications.

Manufactured from heavy-duty steel and high-grade alloy components, the injector is built to withstand extreme cylinder pressures, thermal cycling, and corrosive fuel chemistry. Precision-machined spray holes and a hardened nozzle tip maintain consistent atomization and flow rate, supporting optimal combustion efficiency and reduced exhaust emissions in compliance with EPA and EU standards. The direct-mount configuration streamlines installation and serviceability, making it a practical choice for fleet operators, rebuild shops, and OEM production lines.

Routine maintenance is straightforward: inspect the injector every 500 operating hours, clean the nozzle tip with approved industrial solvents, and conduct fuel-system diagnostics to identify leaks or misfires. Seals and O-rings should be replaced during scheduled service intervals. Backed by a 12-month OEM quality warranty, the 198-6877 injector provides a dependable, specification-matched solution for heavy-duty Caterpillar 3412 engine applications worldwide.