Caterpillar original 266-4446 258-8745 267-9710 267-3361 Fuel Injector Assembly Replacement for OEM C7 C9 C6.4 Excavator Truck Construction Machinery Parts original new injector

The Genuine Caterpillar 266-4446 (alternate part number 2664446) is an OEM-grade HEUI fuel injector assembly designed for CAT C9 series diesel engines, including C9 ACERT, marine, and power generation variants, with confirmed compatibility for select CAT 3306 and 3406 industrial engines. It is validated for use across heavy-duty equipment ranging from 330C excavators, D6R/D6T dozers and 973C loaders to 627G/637G scrapers, serving sectors including construction, mining, forestry, agriculture, marine, and standby power generation.

Manufactured from high-strength alloy steel with precision-ground valve assemblies and high-performance nozzle technology, this injector supports maximum injection pressures of 23,000 PSI (1,600 Bar) aligned with engine calibration. Its ECM-controlled precision metering and fine fuel atomization optimize combustion efficiency, boost fuel economy, reduce exhaust emissions, and maintain stable power output even under harsh, extended heavy-load operating conditions.

Each unit meets stringent OEM specifications and completes factory calibration and testing before delivery, with cross-reference support for common superseded, remanufactured, and exchange part numbers across global CAT aftermarket supply chains. To ensure long reliable service, follow official installation requirements (such as cleaning injector bores and using new sealing washers) and routine maintenance rules including regular fuel filter replacement and water contamination prevention.