The Craftsman 131.9637 is a 1976 lawn tractor built by Roper and distributed by Craftsman (a part of Sears). It features an 8 hp Tecumseh VM80 305cc 1-cylinder gasoline engine with electric starter and a 3-speed belt-driven gear transmission with 3 forward and 1 reverse gears. The tractor has two-wheel drive, manual steering, disc brakes, and an open operator station. It weighs 404 lbs (183 kg) and has lawn/turf tires sized 15x6 front and 18x9.5 rear. Attachments include a 36" mid-mount mower deck with 2 blades and manual lift, offering a cutting width of 36 inches (91 cm) and cut height from 1.5 to 3.5 inches (3 to 8 cm). Variants include models 9636 (side-discharge) and 9637 (rear-discharge).