The Wheel Horse 616-Z is a zero-turn mower from the 600 Series produced from 1990 to 1992 by Wheel Horse, a part of Toro. It features a 16 hp Onan P216V 2-cylinder air-cooled gasoline engine with a 721 cc displacement. The hydrostatic Eaton 781 transmission provides infinite forward and reverse speeds. The tractor has a wheelbase of 42 inches, length of 71.9 inches, width of 40 inches, and weighs 720 lbs. It includes two-wheel drive, power steering, and an open operator station. The 616-Z offers mid PTO with an electric clutch and supports various attachments including 38", 42", and 52" mid-mount mower decks and a front-mount 52" blade.