Roll-over disc plow

A roll-over disc plow comprising a base frame symmetrical in plan about a longitudinal axis and including a transverse leading beam and side beams merging with the ends of said leading beam and having a convergence rearwardly, a coaxial forward journal in said leading beam, a coaxial rearward journal in said convergence, a plow frame including a plow beam extending diagonally in plan across said axis and including a cross beam adapted to flex rearwardly under load, means for mounting said plow frame in said forward journal and in said rearward journal, a plurality of disc plows arranged along and mounted on said plow beam, means interconnecting said plow frame and said main frame for rotating said plow frame about said axis and with respect to said main frame to lie in either of two extreme positions, said side beams each including a forward upper surface and a rearward upper surface vertically offset upwardly from said forward upper surface, said side beams each further including an upstanding step, each of said upstanding steps comprising a substantially vertical surface interconnecting said forward upper surface with said rearward upper surface, said upstanding step being positioned relative to said cross beam so as to be adjacent with said cross beam when said cross beam is unloaded and to be abutted by said cross beam when said cross beam flexes under plowing load.