Caterpillar original Fuel Injector 306-9390 C6.6 Common Rail Diesel Engine Parts Replacement for OEM 10R-7673, for Wheel Loader 928HZ 938H Excavator original new injector

Engineered for seamless fitment across Caterpillar’s C6-series diesel engine lineup, the 306-9390 high-pressure common rail fuel injector is a purpose-built OEM-equivalent replacement component for demanding off-highway and stationary power use cases. It is compatible with CAT C6, C6.4, C6.6 engine variants, including industrial, marine and generator-specific C6 units, and fits various CAT equipment spanning 320D/323D excavators, 928HZ/938H wheel loaders, 120M/12M motor graders, 963D track loaders, generator sets and industrial power units. It serves operators across construction, mining, power generation, marine, agriculture and industrial manufacturing sectors.

Manufactured to strict OEM production standards, this injector features precision flow calibration, an optimized spray pattern, high-pressure durability and a low-leakage design to deliver stable, consistent fuel delivery under all operating conditions. Operating within the engine’s electronically controlled common rail system, it responds to ECM commands to atomize high-pressure diesel for precise combustion, delivering improved fuel efficiency, reduced particulate emissions, enhanced engine response, reliable cold-start performance and extended engine service life.

Supported by an extensive library of cross-referenced OE, superseded and exchange part numbers, the 306-9390 streamlines parts sourcing for aftermarket distributors, maintenance teams and fleet operators. To ensure expected performance, installers must verify part compatibility, replace sealing washers and O-rings, follow Caterpillar torque specifications and complete post-installation fuel system priming and ECM diagnostics. Routine premium diesel use, scheduled fuel filter replacement and periodic injector performance testing help extend the injector’s service life.