In the mobile hydraulics world, there are many applications that require a hydrostatic pump, also known as a transmission. Most applications are centered around some sort of propulsion of a machine, but there are many others like conveyors, drills, etc. Most will drive some sort of hydraulic motor. Applications range from huge harvester combines to small walk behind mowers. Displacements of these pumps can range tremendously from just a few cc to well over 200. These types of applications are known as “closed loop”.