Caterpillar original Fuel Injector 7W-7038 0R-4124 Replacement for OEM, Engine 3306 3306B, Application Construction Machinery Tractor for D6H D6R 140H D6D original new injector

Built for demanding diesel operations, the Caterpillar 0R-4124 fuel injector nozzle is a mechanical fuel injection component manufactured to OEM specifications. It supports accurate fuel metering and consistent atomization in high-pressure fuel delivery systems. High-pressure fuel enters through precision-machined internal passages; at calibrated opening pressure, the needle valve lifts and fuel passes through the nozzle orifices into the combustion chamber. Fine droplet formation promotes mixing with compressed air, supporting efficient combustion, stable engine performance and reliable fuel delivery.

Advanced CNC machining, precision grinding and optimized nozzle geometry help maintain dimensional tolerances, spray-pattern consistency and stable fuel flow across varying engine loads. High-strength alloy steel construction provides resistance to wear, corrosion, erosion and thermal fatigue, while heat-treated materials and precision surface finishing support extended service life. The design is intended to help improve fuel efficiency and power output, reduce exhaust emissions and carbon deposits, and support cold starting performance.

The 0R-4124 is associated with CAT 3126, C7, C9, 3116 and 3208 diesel engines and is used across excavators, wheel loaders, bulldozers, motor graders, articulated dump trucks, generator sets, marine engines, industrial power units, agricultural machinery and air compressor systems. Cross references include 0R4124, 7W-4124, 3I-4124, 1R-4124 and 9W-4124. Supplied new or OEM equivalent in industrial export packaging, it suits engine rebuilding, preventative maintenance, fleet management, OEM replacement and aftermarket repair requirements.