A hydraulic motor is a mechanical actuator that
converts hydraulic pressure and
flow into torque and angular displacement (rotation).
The hydraulic motor is the rotary counterpart of
the hydraulic cylinder as a linear actuator.
Most broadly, the category of devices called hydraulic
motors has sometimes included those that run on
hydropower (namely, water engines and water motors)
but in today's terminology the name usually refers more specifically
to motors that use hydraulic fluid as part of
closed hydraulic circuits in modern hydraulic machinery.
Conceptually, a hydraulic motor
should be interchangeable with a hydraulic pump
because it performs the opposite function - similar
to the way a DC electric motor is theoretically
interchangeable with a DC electrical generator.
However, many hydraulic pumps cannot be used
as hydraulic motors because they cannot be backdriven.
Also, a hydraulic motor is usually designed for working pressure
at both sides of the motor, whereas most hydraulic pumps rely
on low pressure provided from the reservoir at the input side
and would leak fluid when abused
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