Hydraulics at Work This article, Motors 101, continues HPS's series of articles focusing on the "basics" of the major categories of hydraulic parts. If you are in the hydraulic power sales or service business and need a reputable hydraulic motor, pump or valve repair provider, HPS is ready to help. Among the many types of liquid energy products available, actuators are defined as "actuators that release energy to do the physical work of hydraulic systems." While the hydraulic pumps move the power and the hydraulic valves control the energy of the fluid, the hydraulic motors do the work, along with the pumps, converting the energy of the fluid into energy. Motors work by converting fluid pressure into motion. The pressure from the pump turns the output shaft of the motor by applying pressure to the gears, pistons or rotors of the hydraulic motor. Selecting a Hydraulic Motor The design of the complete hydraulic system will change depending on the type of mo...