A mower deck level adjuster includes a pair of draft links connected to a frame of a grass mowing machine and pivotable to a plurality of different cutting heights using a foot pedal or hand lever for raising and lowering the mower deck. A pair of adjuster brackets may be attached to the pair of draft links and to a pair of deck brackets on the mower deck. Each adjuster bracket may be pivotable to a plurality of different positions relative to the draft links to secure the mower deck at a level position.