John Deere Power Systems 130 kW (174 hp) and above engines have received U.S. Environmental Protection Agency (EPA) Final Tier 4, European Union (EU) Stage IV and California Air Resources Board (CARB) emissions certification. The PowerTech PVS 6.8L, PowerTech PSS 6.8L, PowerTech PSS 9.0L and PowerTech PSS 13.5L models are the first John Deere off-highway engines to receive Final Tier 4, Stage IV and CARB emissions certification in the 130 kW to 560 kW (174 hp to 750 hp) power category.
"We began the design process by listening to our customers, and we have worked with them every step of the way to ensure our solutions deliver the industry-leading performance and low operating cost they expect from John Deere," said Geoff Stigler, manager of worldwide marketing for John Deere Power Systems. "Our building-block approach has enabled us to adopt the best available technologies to meet each new regulatory tier, and this continues with Final Tier 4/Stage IV."
Final Tier 4/Stage IV emissions regulations begin Jan. 1, 2014, for engines 130 kW (174 hp) and above, and require an 80 percent reduction in nitrogen oxides (NOx) from previous Interim Tier 4/Stage III B requirements. Particulate matter (PM) levels remain the same as those mandated by Interim Tier 4/Stage III B regulations.
For Final Tier 4/Stage IV, John Deere developed the Integrated Emissions Control system to meet the standards. For 93kW (125 hp) and above engines, John Deere will offer models equipped with an Integrated Emissions Control system configured with cooled exhaust gas recirculation (EGR), a diesel oxidation catalyst (DOC) and diesel particulate filter (DPF), as well as an selective catalytic reduction (SCR) system. The DOC/DPF reduces PM while cooled EGR and the SCR system reduce NOx.
With the use of SCR technology for Final Tier 4/Stage IV engines, total fluid economy becomes important, and John Deere is confident that its total fluid operating costs will maintain an industry-leading position. Total fluid economy takes into account both diesel fuel and diesel exhaust fluid (DEF). DEF consumption with John Deere Final Tier 4/Stage IV engines will be 1 to 3 percent of diesel fuel consumption depending on the application. With diesel fuel economy gains achieved through increased injection pressures and the optimized Integrated Emissions Control system, John Deere Final Tier 4/Stage IV engines are expected to improve upon the total fluid economy of Interim Tier 4/Stage III B engines. Low DEF consumption also means the DEF tank size can be smaller, minimizing space required on equipment. Other benefits of low DEF consumption include less on-site bulk storage requirements for customers and extended DEF filter service intervals.