Caterpillar original 456-3544 Common Rail Diesel Injector for Excavator Loader Machinery, fits C9.3 Engine, Replacement for 20R-5079, Cross Reference 456-3493, 367-4293 original new injector

Sourced to meet rigorous heavy-duty aftermarket demands, the Caterpillar (CAT) 456-3544 is a precision-built high-pressure common rail diesel injector engineered exclusively for CAT C9.3 series diesel engines. It fits all documented C9.3 variants (including ACERT, industrial, generator and marine models) and a full lineup of CAT heavy equipment, from 336E-series excavators and 966K/972K wheel loaders to D6T bulldozers, generator sets and mining machinery, and cross-references to CAT Reman number 20R-5079.

Manufactured to strict OEM specifications, this injector features industrial-grade components including precision nozzles, high-pressure resistant parts, heat-treated elements, corrosion-resistant surfaces and pre-verified electronic calibration. Its ECU-controlled precise fuel atomization optimizes combustion efficiency, cuts fuel consumption, reduces exhaust emissions, boosts engine power and delivers faster throttle response even in severe operating environments.

Available in new or remanufactured conditions to match diverse operational and budget needs, the injector meets OEM-equivalent quality standards, comes with a 12-month warranty, and offers neutral or customized packaging. It serves core industrial sectors including construction, mining, power generation and marine auxiliary power, with distribution across all major global industrial markets, and is a trusted replacement solution for fleet operators, maintenance teams and parts distributors.