Hydraulic motors are used in any app requiring rotational force, also referred to as torque. A hydraulic electric motor converts hydrostatic energy into mechanical energy by pushing vanes, gears or pistons mounted on a crankshaft.
Hydraulic motors are utilized for many applications now such as winches and crane drives, wheel motors for military 
vehicles, self-driven cranes, excavators, conveyor and feeder drives, cooling fan drives, mixer and agitator drives, roll mills, drum drives for digesters, trommels and kilns, shredders, drilling rigs, trench
Hydraulic motors are rotary actuators that convert hydraulic, or fluid energy into mechanical power. They function in tandem with a hydraulic pump, which converts mechanical power into fluid, or hydraulic power. … Fixed-displacement motors drive lots at a continuous speed while a constant input stream is provided.