Hardest Working, Most Reliable Heavy Equipment on the Planet Doosan Infracore Construction Equipment products are known for reliability and quality. When you choose Doosan for your heavy equipment and construction equipment needs, our world-class customer service and product support includes the following advantages: Doosan Elite Plus preventive maintenance programs Competitive financing programs Extensive dealer network for unmatched product service and support A competitive All-Makes parts program Doosan. The closer you look, the better we get.