A Hydrostatic transmission is a transmission that is completely submersed in Oil. For current models, a 20W-50 oil is being used. This unit is controlled by a lever that manipulates hydraulic pumps within the transmission. The further in either direction you move the lever, the harder the pumps operate. These pumps then control the speed at which the drive wheels rotate.
Transmatic drives are similar to a manual shift automobile.
To drive, you have to put the unit into gear and release the clutch. It is not necessary to accelerate through gears like a manual car, you can simply select any gear and operate at that speed. For AutoDrive units, the drive system is set up to operate similar to that of an automatic car. You simply need to put a unit into forward or reverse and then press the accelerator until the desired speed is reached. If you didn't find a question related to your problem, please check out the troubleshooting section for your product.