Caterpillar original For Caterpillar Engine, Diesel Common Rail Fuel Injector 20R-3477, Common Rail Injectors for Equipment, Replacement for OEM 375-4106, 10R-1275, 359-5469 original new injector

For distributors, fleet operators and engine rebuilders sourcing compatible fuel system parts for high-horsepower Caterpillar platforms, the 20R-3477 diesel fuel injector is a precision-engineered replacement solution purpose-built for the CAT 3512B engine series. It supports full interchangeability with a set of verified cross-reference numbers, reducing sourcing complexity for maintenance and overhaul projects, and fits a wide range of 3512B variants across industrial, marine, mining, power generation and oil & gas use cases.

Designed as a high-precision fuel metering component, the injector delivers calibrated high-pressure fuel atomization through its multi-hole nozzle to support complete combustion in CAT 3512B engines. Its optimized spray pattern ensures even fuel distribution across the combustion chamber, lowering fuel consumption, reducing exhaust emissions and particulate matter, improving cold-start performance, and boosting sustained engine output while minimizing carbon buildup and localized hot spots for smoother, more stable operation.

Manufactured to strict OEM and Caterpillar fuel system performance standards, the 20R-3477 features hardened alloy steel construction with corrosion-resistant surface treatment to withstand harsh operating conditions. Every unit undergoes extensive pre-shipment testing for spray pattern consistency, fuel delivery accuracy, leakage prevention and durability, and comes with a 12-month warranty for reliable performance in continuous heavy-duty operation.