Caterpillar original  C6.6 321-0990 Common Rail Diesel Fuel Injector Replacement for CAT 320D Perkins Excavator Spare Parts 2645A743 10R-7668 new original new injector

The Caterpillar 321-0990 fuel injector is a high-precision, electronically controlled common rail component engineered for CAT C6 series diesel engines. Manufactured in strict accordance with original equipment specifications, this injector incorporates micron-level nozzle machining and hardened alloy steel construction to deliver consistent fuel metering, optimized spray atomization, and stable performance under demanding operating conditions. With high pressure resistance exceeding 1800 bar and thermal stability ranging from -40°C to +120°C, the unit is built to withstand extreme industrial environments while supporting improved fuel efficiency, reduced exhaust emissions, and enhanced engine output.

This injector serves as a direct-fit replacement for multiple part numbers including 10R-7220, 326-1641, 326-1642, 387-9433, 2645A746, 2645A747, 320-0680, 320-0677, 295-1411, 3126B, 3126E, and 10R-7220?, making it a versatile solution for fleet maintenance and engine overhaul operations. It is compatible with CAT C6, C6.4, C6.6, 3126, 3126B, and 3126E engines installed in hydraulic excavators, wheel loaders, bulldozers, backhoe loaders, motor graders, skid steer loaders, mining machinery, generator sets, and marine propulsion systems. Corrosion-resistant treatment protects against fuel contamination, moisture, oxidation, and sulfur exposure.

Designed for a service life of 5,000 to 10,000 operating hours under proper maintenance practices, the 321-0990 injector provides OEM-level performance, reliable cold starting, and lower total operating costs. It is suitable for industrial, construction, mining, marine, agricultural, and power generation applications, offering dependable fuel system performance for heavy equipment operators, equipment dealers, and aftermarket distributors seeking authentic Caterpillar replacement parts.