The Acremaster 404A is a four-wheel drive (4WD) tractor from the 400 Series, produced from 1982 to 1984. Built in Merredin, Australia, it features a powerful Mercedes-Benz OM404A 20.9L 12-cylinder turbocharged diesel engine delivering 515 hp (384.0 kW). The tractor includes a 12-speed power shift transmission with 12 forward and 3 reverse gears, articulated power steering, and a standard cab with air-conditioning. It rides on large 30.5x32 tires front and rear, and weighs 46297 lbs (21000 kg).