original 557-7627 Diesel Fuel Injector Assembly Replacement for 5577627 387-9433 10R-7222 328-2574 Excavator C7 C9 Engine new injector original new injector

The C7 C9 C9.3 Fuel Injector 557-7627 is engineered specifically for C7, C7 ACERT, C9, and C9.3 diesel engines, delivering OE-style fitment and dependable common rail performance. With extensive cross reference coverage including 20R-9079, 387-9427, 10R-7225, 20R-8066, 268-1835, 295-1411, and 328-3585, this unit serves as a direct replacement for excavators such as 324D, 325D, 326D, 328D, and 329D, wheel loaders 950H and 962H, and motor graders 12K, 12M, 120K, 140K, 140M, and 160K operating in construction, mining, and material handling environments.

Designed to meet the precision demands of modern common rail systems, this injector provides accurate fuel metering, stable injection pressure, fine atomization, and efficient combustion. It helps restore engine power, throttle response, fuel economy, and idle quality, while reducing exhaust smoke and misfire under heavy load. The OE-style connector, sealing geometry, and injector body dimensions ensure straightforward installation on factory-equipped C7 and C9 platforms without modification.

Routine maintenance should include clean diesel supply, regular fuel filter replacement, water separator inspection, return-flow testing, and periodic injector balance and nozzle spray testing. The most common cause of premature injector failure is fuel system contamination. To support global aftermarket distribution, the injector is offered in original, reman, and aftermarket grades with secure sealed packaging, making it a reliable choice for repair workshops, fleet maintenance operations, diesel parts distributors, mining equipment operators, and international parts exporters.