Yard tractors cost thousands of dollars nowadays, but back in the 1960s, you could assemble your own from a kit costing just $350. It came with machined parts, tracks, pulleys, bolts, shafts, a welded-steel body, and a six-hp.,, four-cycle engine. All you'd need to build it were your screwdrivers, pliers and wrenches, although DIY enthusiasts could also opt for a low-cost model with a plywood body and hardwood strips for tracks.
Driving the tractor was simple. Plush the control level to move forward. Pull it back to brake. To reverse, push the pedal with your left foot and push both levers forward. To turn sharply, brake the inside lever while pushing the outside one forward.
"Midget Yard-Dozer You Can Build"