original 577-7633 Diesel Fuel HEUI Injector Common Rail Injector 5777633 235-5261 20R8968 20R-9079 387-9435 for C7 C9 E330D E336D Excavator Replacement for OEM original new injector

Engineered for demanding C9 diesel platforms, this heavy-duty fuel injector assembly delivers precision fuel metering, stable atomization, and reliable long-service performance across construction, mining, and industrial power applications. Identified by primary OE number 577-7633 and cross-referenced to 557-7633, 20R-8968, 20R-8064, 235-5261, 10R-7222, 387-9438, 328-2577, 20R-9433, and 10R-4764, this HEUI injector is manufactured to industrial-grade standards for direct replacement compatibility with the original C9 fuel system architecture.

The injector supports a broad range of C9-powered equipment, including 330D, 336D, 336D2, 340D2 series excavators, 140M, 160M, 160M2 motor graders, 627G and 637G wheel tractor scrapers, 814F II wheel dozer, 815F II and 816F II compactors, 973C track loader, MD5075 and MD5075C drills, TH31-C9P petroleum package, and 521B through 552 2 forestry equipment. C9.3 fitment must be verified by engine serial number, machine arrangement, injector trim code, and ECM configuration to ensure correct application.

Designed to restore engine performance, this replacement injector helps improve starting behavior, idle quality, acceleration, load response, fuel efficiency, and smoke control. It resolves common HEUI faults such as hard starting, rough idle, misfire, black or white smoke, fuel knock, high fuel consumption, and low power. Ideal for fleet service operations, diesel engine rebuild programs, and international spare parts distribution channels seeking dependable C9 fuel system components.