Caterpillar original 573-4231 387-9435 577-7633 Diesel Common Rail Injector for C9 E330D E336D 330D 340D 336D Excavator Engine new injector original new injector

The Caterpillar 573-4231 fuel injector is a genuine OEM common rail injector engineered for the C9 and C9 ACERT engine platforms. Designed and manufactured to original Caterpillar specifications, this injector delivers precise fuel metering and consistent spray patterns across all operating conditions. It is fully interchangeable with part numbers 20R-8846, 20R-8064, 20R-8069, 293-4072, 387-9432, 387-9435, 267-3360, 328-2574, 11R-1582, 557-7637, and 557-7634, allowing for straightforward replacement across multiple C9 engine variants without modification.

This injector features multi-hole nozzle technology that produces ultra-fine atomization, enabling faster and more complete combustion within the cylinder. High pressure resistance components ensure stable performance under the demanding injection pressures of the C9 common rail system, while corrosion resistant internal parts contribute to extended service life. Built to OEM manufacturing standards, the assembly supports improved torque output, enhanced engine response, and reduced particulate emissions, making it suitable for both heavy-duty and continuous-duty applications.

The 573-4231 injector is widely used in excavators, wheel loaders such as the 950H, 962H, 966H, 972H, and 980H, as well as generator sets, marine propulsion units, mining machinery, and other industrial equipment powered by Caterpillar C9 diesel engines. Its robust construction and precise calibration make it a reliable solution for fuel system maintenance, engine rebuilds, and component replacement in commercial and industrial fleets operating in harsh environments worldwide.