Cummins 4326779 Fuel Injector Assembly

The Cummins 4326779 is a common rail diesel fuel injector designed for high-horsepower QSK series engines. It utilizes solenoid-actuated injection technology for precise fuel metering and combustion control. The injector body is constructed from high-speed steel to withstand extreme injection pressures and thermal cycling. This assembly includes the nozzle, control valve, and solenoid actuator as a calibrated unit. Primary applications include Cummins QSK23, QSK45, and QSK60 engines used in heavy construction machinery, mining trucks, and power generation equipment. Verified equipment fitments include Komatsu HD1500 haul trucks and Hitachi EX1200 hydraulic excavators. The part supersedes OEM references 4088426 and 4010158, with 4087892 as the designated remanufactured core number. Remanufactured variants carry NX, PX, and RX suffixes.