Cummins original Common Rail Fuel Injector 4955525 4964172 Replacement for OEM 0986435614 Cross Reference 4964171 for QSK38 QSK19 QSK50 QSK60 Construction Machinery Mining original new injector

Designed for heavy-duty fuel-injection service inquiries, the Cummins 4955525 diesel fuel injector is positioned primarily for QSK19 engine applications. Its strongest published cross reference is 4964171, with related variants including 4955525NX, 4955525PX, 4955525RX, 4964171NX, 4964171PX and 4964171RX. The part-number group supports sourcing for generator sets, mining equipment, construction machinery, marine engines, oil-and-gas equipment and industrial power units.

As a precision fuel-metering and atomizing component, the injector receives pressurized diesel, controls injection timing and quantity, and delivers finely atomized fuel to the combustion chamber. Correct injection supports smooth starting, steady idling, rated power output, reduced smoke and maintained fuel efficiency. For maintenance teams, the part number provides a focused reference when investigating leakage, over-fueling, under-fueling, misfire, poor atomization or exhaust-temperature imbalance associated with a worn injector.

QSK19 is the primary fitment position. K19, KTA19, K38, QSK38, K50 and QSK50 are extended inquiry-matching terms only, not confirmation of interchangeability. Wider search-group numbers also require verification and should not be treated as automatic replacements. Before ordering, buyers should submit the engine serial number, CPL, engine and equipment models, original injector number, tag photo, fuel-system and ECM/control details, required condition, quantity and destination country so fitment can be checked against the removed injector and engine configuration.