Abstract: A mowing machine with a self propelled carriage for riding with steering front and powered rear wheels with a mowing cutter structure with three mower decks transversely distributed and suspended from the carriage between front and rear wheels, each deck with a vertical spindle carrying a cutter blade. The center deck is suspended from the carriage for vertical lift and adjustment with an outboard deck supported by hinges on each of its sides for up and down pivoting to follow ground contour, for individual power tilting for brush trimming, clearing of obstacles, and to narrow the plan form for transport. A transverse rear axle has a differential with a forwardly extending housing carrying, in series, a carriage drive speed change transmission, a carriage drive clutch, an input drive gear driven from an overhead engine, a mower control clutch, and a triple power head with three gear connected projecting power take-off shafts.