The four new 9RX tractor models range in engine power from 470hp to 620hp. According to John Deere, the tractor features a large undercarriage and track system engineered to provide durability and improved ride quality, especially when handling large implements in the field.The 9RX undercarriage features a positive-drive track system that effectively delivers more power to the ground. John Deere claims this is ideal for heavy draft applications such as cultivating, ploughing, discing, subsoiling and large-scale drilling applications.