Doosan has introduced its first Tier 4 compliant wheel loaders, the DL300- 5, DL350-5, DL420-5, DL450-5 and DL550-5,with a horsepower range of 271 hp in the DL300-5 to 379 hp in the DL550-5.
The five new models replace the previous Tier 4 interim (T4i) models and are powered by Scania diesel engines. The engines are optimized for use with a high-pressure common-rail (HPCR) fuel delivery system and a cooled exhaust gas recirculation (CEGR) system.
They utilize a diesel oxidation catalyst (DOC) to reduce particulate matter (PM) and selective catalyst reduction (SCR) aftertreatment to reduce nitrogen oxides (NOx) Additionally, the wheel loaders use a variety of aftertreatment systems as part of the Tier 4 compliance, such as diesel exhaust fluid (DEF), which is used with SCR technology and stored in a DEF tank.
