Bosch original Common Rail Diesel Fuel Injector for Truck, 0445120336, 4983514, 5256034, 5289380 High Pressure Diesel Fuel Injection Engine Part original new injector

Built for demanding high-pressure common rail systems, the Bosch 0445120336 is an original new 120 Series diesel fuel injector engineered for precise fuel delivery in heavy-duty service. Its solenoid-controlled operation supports injection pressures up to 1,800 bar, while factory calibration and Bosch OEM manufacturing standards help ensure consistent performance. Accurate fuel metering and multi-hole atomization create an optimized spray pattern, supporting efficient combustion, torque output, fuel economy, emissions control, and dependable engine operation.

The injector is designed for Cummins QSB6.7 and ISB6.7 engines, including QSB 6.7 Tier III and Tier IV variants, as well as the Cummins industrial diesel engine platform. Cross references include Cummins 5289380, 5289380NX, 5289380RX and 5289380PX, plus RF0445120336, R0445120336, CR0445120336, MD0420R and MD0420N. Typical equipment includes excavators, wheel loaders, generator sets, agricultural tractors, harvesters, mining machinery, industrial pumps, marine auxiliary engines and heavy-duty commercial vehicles.

Within the system, the ECU determines timing and fuel quantity, the solenoid opens with millisecond precision, and the nozzle converts pressurized diesel into fine droplets for efficient combustion. For professional installation, clean and inspect the bore and sealing surfaces, replace the sealing washer, and follow OEM torque, coding, leak-test and diagnostic procedures. Clean fuel, scheduled filter replacement, contamination control and return-flow testing are recommended maintenance practices. These capabilities make it a practical sourcing choice for industrial maintenance and engine-service operations.