The Wheel Horse 612-Z is a zero-turn mower from the 600 Series produced between 1990 and 1991 by Wheel Horse, a part of Toro. It features a 12 hp Onan E125V 1-cylinder air-cooled gasoline engine with a 3-gallon fuel tank. The hydrostatic Eaton 780 transmission offers infinite forward and reverse speeds. The tractor has a wheelbase of 42 inches, length of 71.9 inches, width of 40 inches, and weighs 683 lbs. It uses 11x4.00-5 front tires and 18x9.50-8 rear tires. Electrical system includes a 12-volt battery with 280 CCA and negative ground. The mid PTO is independent with an electric clutch. Attachments include 38" and 42" mid-mount mower decks and a 52" front-mount blade.