An agricultural machine comprising: a motor vehicle that can move in two opposite directions, a direction of travel for work, and a transport direction, a driver's cabin that can move along the motor vehicle, at least one central support connected to the lifting device of the motor vehicle and supporting front working units intended to cut standing plant products, the working units that protrude laterally from the motor vehicle being able to be moved by means of the central support into a transport position in which they are positioned longitudinally at least partly above the motor vehicle.