Abstract: A self-equilizing mechanical leverage system for well-drilling derricks is provided for coupling pairs of hydraulic rams in side-by-side arrangement to a common load, in a manner to overcome the tendency of one ram of a pair to advance more rapidly than the other. The system is especially adapted for use with well-drilling derrick systems, for raising and lowering the drilling head and pipe string using elongated hydraulic cylinders and rams as the lifting means.