Hydro-Gear’s entry-level commercial transaxle is designed to give you reliable and quiet performance every time you turn the key. The ZT-3100® features a high-efficiency 10cc pump and 16cc motor, 1” axle shaft, and external oil filter for fast, easy maintenance. The Performance Package takes it up another notch with shock valves to extend system life, durable cut steel gears, and a charge pump.