Bosch original Qsb4.5 Qsb6.7 S6D107 ISDE Engine Common Rail Fuel Injector 0445120123 525426 for Excavator, Replacement for OEM 0445120369, 0445120231 original new injector

Accurate fuel metering is central to the Bosch 0445120123 (0 445 120 123), an original new OEM high-pressure common rail diesel injector designed for optimized atomization. Within the CRDI system, the ECU controls injection timing and quantity through the solenoid valve, enabling precise needle lift and fuel delivery through micro-orifices. Multiple injection events support efficient combustion, reduced fuel consumption, lower emissions, less noise and enhanced power output. Compatibility covers Cummins ISBe4.5, ISBe6.7, ISDe4.5, ISDe6.7, QSB4.5 and QSB6.7 engines, plus listed B Series, C Series and industrial engine platforms.

Manufactured to Bosch OE specifiions, the injector uses micron-level production tolerances and multi-hole nozzle technology to support precise delivery and improved combustion efficiency. Its high-pressure capability suits modern common rail systems, while advanced surface treatment provides corrosion resistance against fuel contamination. The design is engineered for long service life in heavy-duty commercial and industrial operation. Cross references include Bosch exchange number 0986435505, Cummins numbers and alternative references, supporting part-number identifiion during replacement sourcing.

Appliions include heavy-duty trucks, commercial buses, excavators, wheel loaders, road machinery, agricultural tractors, generator sets, marine engines and industrial power units. Installation requires a clean environment, OEM torque specifiions, sealing washer replacement, fuel-line inspection, leak testing and injector coding verifiion, with ECU calibration if necessary. Regular fuel-filter replacement, premium diesel, water-contamination prevention and periodic diagnostic scanning help maintain dependable performance.