Cummins original 4087977 HPI Diesel Fuel Injector Common Rail Fuel Injector Replacement for OEM Auto Spare Parts for QSX23 QSK23 Engines in Mining Excavator Dump Truck Truck original new injector

Built for the demands of severe-duty power generation and mining operations, the 4087977 fuel injector is engineered as a direct-fit replacement component for the Cummins QSK23 series diesel engine. As part of the Cummins High Pressure Injection (HPI) fuel system, this injector assembly supports the full-authority electronic fuel control used across QSK23 G-Drive engines, delivering precise fuel metering and fine atomization under the extreme pressures that heavy-duty applications require.

The injector features heavy-duty construction, high-pressure compatibility, heat resistance, and reliable sealing to withstand continuous operation in large mining excavators, generator sets, oilfield power units, construction machinery, mining trucks, and industrial stationary engines. Authorized cross-reference numbers include 4326640, 4902827, 6560-11-1114, and 6560-11-1414, giving procurement teams broad interchangeability and simplified sourcing. Optional test support and export-ready packaging make it suitable for fleet maintenance spare-parts stock and international distribution.

To maximize service life, maintenance should prioritize clean fuel, timely filter replacement, water separator care, ECM diagnostics, and return flow testing. Common failure symptoms—hard starting, rough idle, black or white smoke, low power, high fuel consumption, and misfire codes—can be diagnosed through part-number verification, fuel pressure testing, cylinder cut-out testing, and injector bench testing. Final compatibility must be confirmed by engine serial number and the old injector number.