If you are looking for the answers to questions - What is the use of a hydraulic power pack? and/or What is the function of hydraulic power supply? Then read on. Machine Tree is a manufacturer and supplier of hydraulic power packs, which is known as a stand-alone assembly which comprises various components such as a hydraulic pump, drive motor, and hydraulic fluid tank. The superb quality hydraulic power pack is used for the operation of presses, cylinders and jacks.