Caterpillar original Caterpillar 306-9390 fuel injector common rail for C6.6 engine 928HZ 938H wheel loader excavator new injector original new injector

The Caterpillar 306-9390 fuel injector is manufactured to OEM-equivalent standards for CAT C6, C6.4, and C6.6 diesel engines, delivering reliable performance across demanding industrial, construction, and power generation applications. Each unit is produced with precision flow calibration and optimized atomization, ensuring superior spray pattern, stable fuel delivery, and consistent combustion efficiency. The high-pressure common rail design supports accurate fuel metering, excellent cold-start performance, lower emissions, and improved fuel economy. Built with a low-leakage architecture and high-pressure durability, this injector provides extended service life and helps maintain long-term engine reliability under heavy-duty operating conditions.

This common rail injector is engineered as a direct replacement for multiple Caterpillar and Perkins cross references, including 10R-7674, 320-0690, 310-9067, 306-9380, 292-3780, 292-3790, 320-0688, 321-0990, 321-3600, 382-0480, 2645A749, 2645A751, 2645A734, 2645A735, 2645A719, and 320D2. It is widely used in equipment such as CAT 320D, 320DL, 320D2, 323D, 323DL, 324D, 325D, 928HZ, 938H, IT38H, 963D, 120M, and 12M, as well as generator sets and industrial power units. The injector is suitable for construction, mining, marine, agricultural, and stationary industrial applications, making it a versatile solution for fleet operators and service professionals.

For proper installation, confirm part number compatibility, clean the injector bore, inspect the fuel rail, and replace all sealing washers and O-rings. Follow Caterpillar torque specifications, use clean fuel system tools, install the injector vertically, prime the fuel system, and verify fuel pressure and injector balance rates. Conduct periodic injector performance testing, replace fuel filters at OEM-recommended intervals, and use premium diesel fuel free from water contamination to prevent common failures such as hard starting, rough idle, excessive smoke, engine misfire, reduced power, increased fuel consumption, and excessive emissions.