The Toro Company has announced a partnership with Yanmar America Corp, in which Yanmar will provide diesel engines for select Toro commercial turf maintenance equipment. The Yanmar diesel engines will allow Toro to comply with the U.S. Environmental Protection Agency’s Tier 4 emissions regulations, which go into effect Jan. 1, 2013.
 
Yanmar will provide Toro with EPA-compliant diesel engine models. The low total lifecycle ownership cost of Yanmar’s diesel engines along with innovative technology and reduced environmental impact were deciding factors in Toro’s decision to form a partnership with Yanmar. The first Toro products to feature Yanmar’s Tier 4 compliant diesel engine technology will be select commercial mowers over 25 hp.
 
Tier 4 is the strictest EPA emissions requirement for off-highway diesel engines. The regulations set specific limits on the amount of pollutants, specifically oxides of nitrogen and particulate matter that can be released into the environment. The requirements are part of the federal Clean Air Act to reduce air pollution because of its potential hazards to human health and the environment. In May 2004, as part of its Clean Diesel Program, the EPA finalized a comprehensive rule to reduce emissions from non-road diesel engines. The rule consists of four tiers of emissions standards; Tier 4 is the final stage.