Caterpillar 0R-3420 Injector Nozzle Product Description Product Overview The Caterpillar 0R-3420 Injector Nozzle is a high-precision diesel fuel injection component engineered for demanding heavy-duty applications. Designed to meet strict OEM dimensional and performance standards, the 0R-3420 nozzle plays a critical role in achieving proper fuel atomization, combustion efficiency, engine power output, fuel economy, and emissions control. In modern Caterpillar diesel engines, fuel injection performance directly impacts engine reliability and operating costs. The 0R-3420 nozzle is manufactured using premium alloy steel materials and advanced precision grinding technology to ensure stable injection pressure characteristics, consistent spray patterns, and long service life under extreme operating conditions. This injector nozzle is widely used in Caterpillar-powered construction equipment, mining machinery, industrial engines, generator sets, marine propulsion systems, and heavy transportation equipment operating around the world. The 0R-3420 nozzle is recognized in global diesel fuel injection markets as a reliable replacement solution for OEM fuel injector rebuilding programs, remanufactured injector assemblies, and preventive maintenance schedules.