Bosch original QSB5.9 5.9 Diesel Engine Fuel Injector 0445120151, Cross Reference 4981128, 0445120152 for PC200-8 PC210-8 Excavator, Replacement for OEM 5263312 original new injector

The BOSCH 0445120151 is an original Bosch 120 Series common rail diesel fuel injector engineered for high-pressure Common Rail Direct Injection systems. Manufactured to Bosch OEM specifiions, it is cross-referenced to Bosch 0445120239 and Cummins OEM numbers 4981128 and 5263312. The injector is compatible with Cummins QSB5.9, QSB6.7, ISB5.9, ISB6.7, B5.9 and B6.7 engines, as well as specified industrial, generator, construction and agricultural diesel engine appliions.

Within the fuel system, the injector receives diesel stored under pressure in the common rail and operates under ECU control. Solenoid activation and hydraulic needle control enable precise fuel delivery through the nozzle, supporting accurate fuel metering, injection timing and optimized atomization. These functions help improve combustion efficiency, power output and cold-start performance while supporting lower fuel consumption and reduced emissions. Associated service references include nozzle DLLA143P1528, nozzle assembly 0433171942, control valve F00RJ02130 and solenoid assembly F00RJ02697.

Designed for Cummins-powered commercial trucks, buses, construction machinery, industrial power units, diesel generators, agricultural equipment, mining machinery and marine auxiliary engines, the 0445120151 serves OEM and aftermarket replacement requirements. For installation, use new sealing washers, maintain complete fuel-system cleanliness, follow OEM torque specifiions and perform injector coding when required by the ECU strategy. Service life is supported by clean fuel, regular fuel-filter replacement, clean tanks, avoidance of water contamination, monitoring of injector correction values and preventive diagnostics.