Caterpillar original Common Rail Fuel Injector, Fuel Injector Nozzle Cross Reference 7W-7031, 7W-7026, 9Y0818, 0R-8785 Replacement for OEM, for CAT 3406B Diesel Engine, Excavator original new injector

Built around the Caterpillar 7W-7031 fuel valve nozzle platform, the CAT 0R-8785 Fuel Injector Nozzle Assembly is a remanufactured diesel fuel injection component for heavy-duty Caterpillar engines. It is compatible with 3406, 3406B, 3406C, 3412 and 3412C engines, as well as the SR4 generator engine. Its application coverage includes industrial and marine diesel engines, construction and mining equipment, power generation and other heavy-duty operating environments.

Within the fuel injection cycle, pressurized fuel lifts the nozzle needle once opening pressure is reached, then passes through microscopic nozzle holes for precision atomization. The resulting spray mixes with compressed combustion air to support efficient combustion. Designed to OEM specifications, the assembly provides precise fuel metering, uniform spray distribution and stable injection characteristics. These functions support improved combustion and thermal efficiency, reduced fuel consumption, lower exhaust emissions, reduced smoke and consistent engine operation.

Manufactured with hardened alloy steel, CNC-machined components and micron-level internal tolerances, the nozzle follows OEM geometry standards. Hardened internal components and anti-corrosion treatment contribute to wear resistance and extended service life, while consistent injection pressure helps reduce downtime. The product is supplied to an OEM-equivalent quality standard with a 12-month warranty. For dependable performance, use clean diesel fuel, replace fuel filters regularly, prevent water contamination and perform periodic injector testing.