Caterpillar original C6.6 Engine 320-0688 Common Rail Injector, 10R-7939 for Excavator, Caterpillar 320d D6N Diesel Engine Spare Parts Fuel Injector original new injector

As a precision-engineered industrial-grade component, the Caterpillar C6 Series 320-0688 fuel injector is purpose-built for heavy-duty diesel engine applications, fully compliant with strict OEM specifications. Designed as a direct-fit replacement for CAT C6.4 and C6.6 diesel engines, it carries the official OE part number 320-0688 (alternatively formatted as 3200688) and cross reference number 10R-7220, delivering guaranteed compatibility for specified CAT engine platforms.

Constructed from high-strength precision-machined steel with anti-corrosion coatings, this injector features a high-pressure resistant design rated up to 2200 bar, paired with OEM-standard sealing and spring assemblies. Controlled by the engine ECU, it delivers precisely timed, metered fuel delivery and fine atomization into the combustion chamber, optimizing combustion efficiency, reducing emissions, and improving fuel economy, while its direct engine mount design enables straightforward, tool-compatible installation.

Suitable for a wide range of equipment across construction, mining, industrial, agricultural and marine sectors, it fits excavators, loaders, bulldozers, mining equipment, generators, compressors, industrial engines, tractors, harvesters and medium-duty marine engines. It comes with a 12-month industrial warranty and OEM-style protective packaging, and supports long-term reliable operation when paired with clean filtered diesel and routine 500-hour nozzle inspections, minimizing unplanned fleet downtime.