Caterpillar original 557-7633 Fuel Injector for C9 Diesel Engine, Replacement for OEM 328-2574, 557-7627, 293-4072, for E330D E336D Excavator original new injector

The Caterpillar 557-7633 is a precision-engineered original HEUI fuel injector purpose-built for the CAT C9 diesel engine platform, serving as a critical component of the engine’s fuel delivery system. Manufactured to meet strict OEM-level engineering standards, it delivers accurate fuel metering, superior atomization and optimized combustion efficiency, helping to reduce exhaust emissions, maximize power output and improve fuel economy for heavy-duty diesel equipment operating in harsh off-highway conditions.

This injector is compatible with an extensive range of CAT heavy equipment, including 330D, 330DL, 336D, 336D2 and 340D series excavators, 950H, 966H and 972H wheel loaders, as well as industrial power units, generator sets, mining machinery, oilfield equipment and marine auxiliary systems. It supports multiple cross-reference part numbers to fulfill diverse equipment maintenance, repair and overhaul requirements across industrial sectors.

Constructed with high-strength alloy steel components, precision-ground needle valves and multi-hole nozzles, it features high pressure resistance, advanced corrosion protection and a long service life tailored for severe-duty applications. To ensure optimal performance, installation must follow Caterpillar service manual guidelines, including pre-installation fuel system inspection, O-ring and copper sealing washer replacement, proper torque application, and post-installation priming, leak testing and ECM diagnostic scans.