Komatsu’s D61-23 crawler dozer has a Komatsu Tier 4-Interim SAA6D107E-2 engine that provides the same horsepower as its predecessor, while lowering fuel consumption by up to 10 percent, the company ...

To make Tier 4 diesels perform to EPA standards, off-road equipment design engineers and manufacturers have had to tighten the cause-and-effect integration between components such as hydraulics, ...

When the Tier rating program started in the U.S. in 1996, the goal was to reduce nitrogen oxide and particulate matter from the exhaust of diesel engines. Since then, engine technology has been ...