SU series steering units are full-hydraulic cycloid rotary valve style steering control units consisting of a rotary valve and a patented Roller Stator® rotor. Hydraulic steering systems consist of steering units, pumps, relief valves (or flow dividing valves), and cylinders. A wide range of accessories are available for low speed heavy duty vehicles in agriculture, shipping, landscaping, road maintenance, forestry, engineering and mining applications. With the assistance of hydraulics these systems can provide tremendous steering power with very little effort. The systems are reliable, flexible and easy to operate.