Bosch original Diesel Fuel Injector 0445120231 0445120199 0445120178 0445120437 Common Rail Injector Replacement, for heavy duty diesel engine application original new injector

Built around the Bosch CRI 120 Series platform, the 0445120231 (0 445 120 231) is an original-quality, electronic solenoid-controlled common rail diesel injector engineered to Bosch OE standards. It supports common rail pressures up to 1,600 bar and is ISO 9001 certified. Cross-reference coverage includes Bosch 0445120059 and 0986435597, together with listed Cummins and Komatsu numbers, giving distributors, workshops, and fleet maintenance teams a clear basis for identifying the required replacement.

Fuel is supplied from the common rail accumulator, while the ECU evaluates operating inputs such as engine speed, load, fuel demand, emissions requirements, turbocharger pressure, and intake air temperature. The solenoid then opens within milliseconds, delivering metered fuel through the DSLA128P5510 nozzle. Micron-level manufacturing tolerances support consistent injection quantity, while the alloy steel body and hardened internal wear surfaces are intended for demanding service. Functional benefits include improved atomization and combustion efficiency, reduced fuel consumption, lower particulate and NOx emissions, and improved cold-start performance.

Engine appliions cover Cummins QSB4.5, QSB5.9, and QSB6.7, plus Komatsu SAA6D107E-1, SAAD107E-1, and SAA6D107E. Listed equipment includes Komatsu PC200-8, PC200LC-8, PC220-8, PC220LC-8, and WA320-6, Hyundai HL770-7A, and Hitachi ZW180. For installation, clean the injector bore, replace the copper washer and O-rings, tighten to OEM torque, perform injector coding, conduct a leak-off test, and verify engine operation.