Caterpillar original Fuel Injector 328-2578 459-8473 C9 C7 Excavator Replacement for OEM 553-2592, for heavy duty diesel engine application, 266-4446 original new injector

For B2B buyers sourcing factory-grade fuel system components for Caterpillar diesel platforms, the original CAT C9 Fuel Injector 328-2578 (alternately formatted 3282578) is a genuine Injector GP designed for C9/C-9 heavy-duty diesel engine applications. Engineered to Caterpillar’s original specifications, it delivers the precise fuel quantity at the exact timing required for efficient internal combustion, and is compatible with modern low-sulfur, low-lubricity diesel fuels. It is officially categorized as a truck engine component in Caterpillar’s public parts catalog.

For replacement and cross-sourcing purposes, the 328-2578 is directly linked to the official Cat Reman replacement number 20R-8062/20R8062, with additional widely adopted market interchange numbers including 10R-7221/10R7221, 10R-4844/10R4844, 293-4068/2934068 and 387-9437/3879437. Additional market search numbers exist across global parts channels, but all non-official cross references require full validation before use as guaranteed direct replacements. Market listings commonly associate the part with C9-powered excavators, loaders and other construction equipment beyond its official truck rating.

Notably, the 328-2578 is marked as discontinued in Caterpillar’s public parts channel, so purchasers may contact an official Cat dealer for replacement guidance and must complete comprehensive fitment checks before ordering. Required verification includes engine serial number, equipment model, existing injector part number, ECM calibration, injector trim code requirements and fuel system type. These checks are mandatory for all non-truck use cases, including C9 ACERT, industrial and construction equipment applications, to prevent compatibility failures and unplanned equipment downtime.