The 8.3-liter, Tier-3 Cummins in Dressta's TD20M Extra crawler dozer delivers 240 net horsepower C an increase of 15 horsepower compared to the H model. An air-grid heater is standard equipment to aid cold-weather starting. The 52,140-pound machine's new cooling module with hydraulically driven fan has replaceable sections including a charge-air cooler, transmission-oil cooler, radiator, and hydraulic-oil/fan-drive oil cooler. A single left-hand joystick replaces two steering levers and a gear-shift lever used on the H. "Great efforts have been made to eliminate or greatly reduce the need for... electronic systems," Dressta says, "The TD20M Extra ... with the exception of the engine, does not require a computer to diagnose problems."
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