John Deere Power Systems (JDPS), Waterloo, Iowa, has announced that its PowerTech PVX 6.8L above 130 kW (174 hp) and PowerTech PSX 6.8L engines have been certified by the Environmental Protection Agency and European Union as compliant with the Interim Tier 4 and Stage III B regulations.
“The EPA and EU certification of our 9.0L engines was a tremendous milestone for JDPS, and now with the 6.8L engines certified we believe it clearly demonstrates our commitment to offer the right technology at the right time,” said Doug Laudick, product planning manager for JDPS.
Interim Tier 4/Stage III B emissions regulations begin January 1, 2011, for 174-hp and above engines, and require a 90 percent reduction in diesel particulate matter and a 50 percent reduction in nitrogen oxide from previous Tier 3/Stage III A requirements.
John Deere modified its PowerTech Plus Tier 3/Stage III A engine platform, which includes cooled exhaust gas recirculation (EGR) for nitrogen oxide control, to meet the new regulations by adding an exhaust filter for reducing particulate matter. Key features of these engines will include full-authority electronic controls; a four-valve cylinder head; a high-pressure fuel system; single variable geometry or series turbocharging; and an air-to-air aftercooling system.
“The Interim Tier 4/Stage III B certification of our 6.8L models confirms our validation processes. Our field and lab testing continues to ensure the final product will meet the unique requirements expected from off-highway diesel engines,” said Laudick. “We have received very positive feedback from customers testing our Interim Tier 4/Stage III B powered machines in the field. And we remain committed to ensuring our engines withstand the extreme vibration, temperatures and duty cycles found in those applications.”
In choosing a solution for Interim Tier 4/Stage III B, John Deere elected not to use selective catalytic reduction (SCR). John Deere’s cooled EGR and exhaust filter approach provides OEMs and end users a proven solution with the best total fluid economy, according to the company.
“For Interim Tier 4/Stage III B, we’re not only looking at fuel economy, we’re taking into consideration total fluid consumption,” said Brian Brown, manager of worldwide marketing support for JDPS.
The PowerTech PVX 6.8L offers a power range of 138 – 187 kW (185 – 250 hp), while the PowerTech PSX 6.8L offers 168 – 224 kW (225 - 300 hp). PowerTech 6.8L engines will go into production in September 2010.