To confirm, some pumps can be used as a motor and visa/versa. The difference is that some pumps will have drilled passages on the suction side of the pump, that prevent blowing out the shaft seal by allowing any oil reaching the seal cavity to be drawn back into the pump. Some pumps and motors will also have wear plates that are held against the gears by the oil pressure. If a pump or motor is configured for a certain rotational direction, as well as being intended as a pump or as a motor, using it differently will cause seal failure or worse.
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