John Deere RE549511 Rail Pressure Relief Valve

The RE549511 is a high-pressure common rail pressure relief valve designed for John Deere PowerTech Plus and PowerTech E engines. It functions as a safety device within the fuel rail assembly, opening at a calibrated pressure threshold to protect the fuel injection system from over-pressure conditions. The valve is a direct replacement for the original equipment fitting installed on 4.5L (4045), 6.8L (6068), and 9.0L (6090) engine platforms. Constructed from high-strength alloy steel with precision-machined sealing surfaces, the component ensures consistent pressure regulation and leak-free performance under extreme operating cycles. It is a non-serviceable, non-returnable original equipment part requiring verification against the engine serial number prior to installation. Compatible with Tier 3, Tier 4 Interim, and Final Tier 4 emission certified engines across tractor, combine, sprayer, and construction machinery applications.