Hitachi excavators will feature engines with cooled exhaust gas recirculation (EGR) and exhaust filers consisting of a diesel oxidation catalyst/diesel particulate filter to meet the 2011 Interim Tier 4/Stage III B emissions regulations mandated by the Environmental Protection Agency and European Union for diesel engines 174 to 750 horsepower.

“Hitachi believes this is the simplest IT4 solution,” said Mark Wall, product marketing manager for Hitachi construction excavators in the Americas.

Hitachi’s approach to meeting IT4 regulations is an evolution of the current clean-burning and fuel-efficient Tier 3/Stage III A Isuzu engine platform currently used in Hitachi excavators.