10 Year PowerTrain Warranty. The SA221 packs the power you’d expect from a much larger tractor. That means the SA221 can do serious work with a front-end loader, a hydraulic backhoe, and three-point hitch attachments for mowing, tilling, planting, digging, plowing and so much more. This tractor stands alone in its industry. Yanmar Tractors are the premier sub compact tractor line.