The Allis Chalmers 620 is a garden tractor produced from 1973 to 1975, built by Simplicity and distributed by Allis Chalmers. It features a 19.5 hp Onan 816cc 2-cylinder gasoline engine, hydrostatic transmission by Sundstrand with infinite forward and reverse gears in 3 ranges, and two-wheel drive with manual steering and disc brakes. The tractor has an open operator station and is built in Port Washington, Wisconsin, USA. It has a fuel capacity of 3.8 gallons and a hydraulic system capacity of 1.25 gallons with 500 psi pressure. The tractor supports optional independent rear PTO and independent front PTO, both with electric clutches. Dimensions include a 56-inch wheelbase, 83-inch length, 48-inch width, and 43.25-inch height, weighing 1300 lbs. Tires include lawn/turf and agricultural options. Attachments include a 60-inch mid-mount mower deck, snowblower, blade, and front-end loaders with various specifications. Electrical system is negative ground with 20 amps charging and 12 volts battery.