The D155AX-6crawler dozer has Komatsu's Sigmadozer blade, which is said to increase soil-holding capacity and eliminate sideway spillage. New frontal design forces material to the center of the blade, reducing digging resistance. With blade capacity of 12.3 cubic yards, the dozer has an operating weight of 87,100 pounds and is powered the company's Tier-3 SAA6D140E-5 diesel that produces 354 net horsepower. Estimated list price: $537,000 (with dozer blade and ripper).