Abstract: The apparatus includes wheeled mower units that are movable between terrain-engaging mowing positions, and upwardly extending travel positions. The mower units are movable longitudinally as a unit when in these mowing positions, but are capable of undergoing adjustive movements relative to each other in response to variations in the contour of the terrain over which they travel. Telescopically adjustable support members permit convenient lateral adjustment of mower units to which they are connected. Piston-and-cylinder assemblies move the mower units to their travel positions. Telescopic drive shafts transmit power to the units.