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To meet increasingly stringent emissions regulations, John Deere has followed a carefully planned building-block approach. We have systematically adopted new technologies and integrated them with our field-proven solutions to meet each regulatory tier.
John Deere was the first engine manufacturer to widely commercialize cooled exhaust gas recirculation (EGR) and variable geometry turbocharger (VGT) technologies in off-highway applications, introducing them in 2005 with the start of Tier 3/Stage III A regulations. At appropriate levels of engine operation, the EGR valve opens and measured amounts of cooled exhaust gas are routed back into the intake manifold and mixed with the incoming fresh air. Since this process removes oxygen from the air, the exhaust temperatures in the combustion process are lowered and the levels of nitrogen oxides (NOx) are reduced.
To achieve Interim Tier 4/Stage III B emissions requirements, we added a catalyzed exhaust filter that contains a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). The DOC reacts with exhaust gases to reduce carbon monoxide, hydrocarbons, and some particulate matter (PM). The downstream DPF forces exhaust gases to flow through porous channel walls, trapping and holding the remaining PM. During normal operating conditions (temperature, load, and speed) the engine's natural heat breaks down the PM and cleans the exhaust filter. An exhaust filter also has the benefit of replacing the muffler in most applications.
Selective catalytic reduction (SCR) combined with our proven Interim Tier 4/Stager IIIr B engine platform is the best solution to achieve Finalr Tierr 4/Stager IV emissions compliance. This technology utilizes a urea-based additive, sometimes referred to as diesel exhaust fluid (DEF). The ammonia in the urea mixes with engine exhaust gases in the SCR catalyst to reduce NOx — converting it to nitrogen and water vapor. This vapor is then expelled through the exhaust pipe. Why did John Deere wait to deploy SCR? We didn't need it before now. Our advanced cooled EGR system met all previous NOx requirements without the need for SCR and a second fluid. We are adding SCR at a time when the infrastructure for DEF is more established and its use is more accepted by equipment owners. SCR has been successfully used in on-highway applications, and the components are now more developed for off-highway applications.
The John Deere Integrated Emissions Control system for Final Tier 4/Stage IV compliance is optimized to meet emissions regulations while delivering improved performance and world-class fluid economy.
John Deere established an unparalleled record of fuel economy with our best-in-class Tier 3/Stage III A engines. Our Interim Tier 4/Stage III B and Final Tier 4/Stage IV technology solutions continue that efficiency by maximizing total fluid economy. With fuel economy gains achieved through increased injection pressures and lower DEF dosing rates delivered by the optimized SCR system, John Deere Final Tier 4/Stage IV engines will meet or improve upon the current total fluid economy of our Interim Tier 4/Stage III B engine models. John Deere Final Tier 4/Stage IV engines operate efficiently with ultra-low sulfur diesel as well as B5 to B20 blends, providing optimal performance and fuel-choice flexibility.
John Deere has a strong advantage when it comes to off-highway expertise. Our Final Tier 4/Stage IV engines offer a field-proven, fluid-efficient approach that stands up to the tough demands of off-highway environments.
John Deere is one of the few manufacturers that designs engines as well as construction, forestry, and agricultural equipment — which gives us a unique advantage in designing and integrating the engine, drivetrain, hydraulics, electronic control unit (ECU), cooling package, and other vehicle systems for optimized efficiency. This integrated process maximizes performance, operator convenience, fuel economy and overall value for John Deere machine owners as well as John Deere OEM customers.
The proven John Deere worldwide dealer network of over 4,000 service locations is prepared to fully support customers and their Final Tier 4/Stage IV engines. John Deere dealers are highly trained to help customers with the performance, service, and support of these new engines and to optimize total machine efficiency.
John Deere engines provide the ultimate combination of performance, fuel economy, and emissions compliance. To meet evolving emissions regulations, John Deere worked closely with equipment manufacturers to identify engine technologies that best suited their needs, while also reducing carbon monoxide, hydrocarbons, nitrogen oxides, and particulate matter.
The first regulations for new nonroad diesel engines over 37 kW (50 hp) began in 1996 when John Deere launched PowerTech™, a new breed of engines that met Tier 1/Stage I emissions regulations. Since then, several tiers and stages have been developed to meet tightened regulations, with the Final Tier 4/Stage IV to be implemented by 2015.
Achieve established baseline levels for PM and NOx
50% reduction in PM
20% reduction in NOx
40% reduction in NOx
90% reduction in PM
50% reduction in NOx
80% reduction in NOx