Abstract: 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.

Abstract: The invention relates to a collapsible lift trolley capable of occupying a compact collapsed position and a deployed in-use position. In accordance with the invention, the collapsible lift trolley comprises a base unit having a turnable wheel, two longitudinal stringers with an end hinged to the base unit to form a support frame when in the deployed position, a support rod upraised from the base unit, a lift arm having an end bent to be hinged on top of the support rod and the other end engaging a hook and a jack interconnecting the support rod and the lift arm for swinging the lift arm relative to the support rod.