A hydraulic pump is equipped with an air motor, which is disposed in a
housing and oil reservoir of the hydraulic pump, connected to an air
source, and has a piston movable in a tube so that pressured air from the
air source can cause reciprocation the a piston to pump hydraulic oil to
other equipments such as a jack. The air actuated hydraulic pump is
equipped with a pilot operated guided poppet valve comprised of several
parts in separable connection, and a muffler so that the user doesn't have
to replace the whole piston with a new one if only one of the parts is
damaged, and that noise can be reduced when the pump is working.
