Hydraulic motors are found in any application requiring rotational force, also referred to as torque. A hydraulic electric motor converts hydrostatic energy into mechanical energy by pushing vanes, gears or pistons attached to 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 liquid energy into mechanical power. They work in tandem with a hydraulic pump, which converts mechanical power into liquid, or hydraulic power. … Fixed-displacement motors drive a load at a constant speed while a continuous input movement is 
provided.