Caterpillar original C6.4 C6.6 C4.4 Engine Common Rail Fuel Injector 2645A749, Cross Reference 320-0680, for Excavator 320D 323D, Replacement for OEM 321-0990, 320-0677 original new injector

Precision-engineered for demanding industrial diesel operating conditions, the CAT 2645A749 fuel injector is a brand-new, OEM-standard component purpose-built for Caterpillar C6-series engine platforms. It is compatible with Caterpillar C6, C6.4, 3054 and 3056 diesel engines, with exact fitment subject to engine configuration, emissions specifications and regional application requirements. Installed in the cylinder head as a core fuel injection system part, it delivers accurately metered high-pressure fuel directly to the combustion chamber, directly impacting engine power output, fuel efficiency, emissions control, cold-start performance and long-term reliability.

Manufactured with high-precision CNC machining and strict dimensional controls, this injector features exceptional high-pressure resistance to withstand the extreme operating pressures of modern diesel engines. Its optimized nozzle design delivers superior fuel atomization to promote complete combustion, while protective coatings enhance resistance to corrosion from diesel fuel contaminants. The robust industrial-grade structure is engineered for extended service life in harsh working environments, and precise fuel metering helps optimize fuel consumption and reduce exhaust emissions.

This versatile injector supports a wide range of heavy-duty equipment across construction, mining, power generation, agriculture and marine sectors, including excavators, loaders, generator sets, farm equipment and marine power systems. It serves as a reliable replacement solution for worn, leaking, clogged or performance-degraded original injectors, helping restore proper engine performance and supporting consistent operation across diverse global industrial applications.