Mason Dynamics - Largest Stocking Bucher / Monarch Hydraulics Distributor in North America monarch hydraulics, monarch parts, monarch power units, hydraulic, hydraulics, dc hydraulics, ac hydraulics, Bucher hydraulics Mason Dynamics has the largest stock of Bucher / Monarch power units and parts in North America. Our 50 year history of servicing Monarch Hydraulics products, along with a massive inventory of gear pumps, cylinders, quick disconnects, hose, fittings, and other hydraulic parts make us the premier hydraulic source for OEMs and hydraulic dealers across the United States.