original 557-7634 Diesel Engine Fuel Injector for C9 Excavator 267-3360 387-9434 10R-4844 High Pressure Fuel Nozzle Injector original new injector

Engineered for demanding heavy-duty operations, the 557-7634 HEUI Fuel Injector is a precision-manufactured component designed for the . C9 and . C9 ACERT 8.8 Liter diesel platforms. This injector assembly delivers OEM calibrated flow rates and high-pressure atomization performance required by modern electronic fuel injection systems, ensuring optimal combustion efficiency across industrial, construction, mining, marine, and power generation applications. Each unit is constructed with heavy-duty materials offering corrosion resistance and extended service life under continuous load conditions.

The 557-7634 injector serves as a direct cross-reference for a wide range of OE numbers including 328-2574, 328-2580, 235-2888, 236-0962, 267-9710, 267-9734, 293-4071, 459-8473, 387-9433, 387-9434, and 254-4330, along with remanufactured equivalents 10R-7221, 10R-7222, 20R-8060, 20R-8065, 20R-1917, and 20R-8968. It is fully compatible with . 330C, 330D, and 336D Excavators, . 950H, 962H, and 966H Wheel Loaders, . 730 and 740 Articulated Trucks, C9 Generator Sets, and Marine Power Units.

For optimal performance, installation should be performed using clean fuel, new sealing washers, and thorough inspection of fuel rail components. Perform injector coding where applicable and verify fuel pressure after installation. Recommended best practices include using OEM-grade fuel filters, avoiding contaminated diesel, and monitoring engine fault codes such as low fuel pressure, injector response failure, cylinder contribution fault, fuel quantity imbalance, and injection timing error to ensure long-term system reliability.