Model 844 Wheel Dozer has been updated to meet Tier 2 emissions requirements. It also features improved engine management, new air-to-air aftercooling for intake air, extended engine-oil change intervals, and a more efficient cooling system. It weighs 156,120 pounds, and the Cat 3412E engine produces 620 net horsepower. The dozer can be equipped with blades ranging from 20.7 to 40.2 cubic yards. The cab features low sound levels and good sight lines on the job.