MOLINE, IL - John Deere will use cooled exhaust gas recirculation (EGR) engines with exhaust filters consisting of a diesel oxidation catalyst/diesel particulate filter in its construction equipment to meet the 2011 Interim Tier 4 (iT4)/Stage III B emissions regulations mandated by the EPA and EU for diesel engines 174 hp and above.

"We're looking to provide the simplest iT4 solution for equipment users, all while delivering the productivity, uptime and low daily operating costs," says Joe Mastanduno, product marketing manager, engines and drivetrains, for John Deere Construction & Forestry. "We believe cooled EGR with exhaust filters is the right technology right now."

Deere's approach to the iT4 solution builds upon the current clean burning and fuel efficient Tier 3/Stage III A PowerTech Plus engine platform manufactured by John Deere Power Systems.

A Simpler Solution
John Deere feels the cooled EGR engine platform for iT4 compliance is simpler, more operator friendly and less complex to maintain compared to SCR (selective catalytic reduction) systems.

"Unlike SCR, this IT4 solution doesn't require liquid urea to achieve emissions compliance, so there are no additional fluids to worry about obtaining, filling or storing on remote jobsites at proper temperatures," Mastanduno said. "EGR is a single-fluid solution, and that fluid is diesel fuel."