Hydraulic motors are found in any application requiring rotational force, also called torque. A hydraulic engine converts hydrostatic energy into mechanical energy by pressing vanes, gears or pistons attached to a crankshaft.
Hydraulic motors are utilized for 
most applications now such as for example 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 a load at a continuous speed while a constant input movement is provided.