Haymaking machine with a safety system

An agricultural machine intended to be coupled to a tractor vehicle and comprising a work unit connected to a chassis of the tractor vehicle relative to which the work unit can be moved, the machine being able to take up a work configuration in which the work unit rests at least partially on the ground and a transport configuration in which the work unit is raised from the ground, the machine comprising:

• a lightening device having at least one lightening cylinder connected to the chassis by a flexible compression tie-rod on one side and to the work unit at a front articulation on the other side, the lightening cylinder being able to transfer, in the work configuration, at least some of the weight of the work unit onto the chassis, the flexible compression tie-rod being attached to the lightening cylinder at an anchoring point, wherein at least one deflection system makes it possible to move the lightening cylinder by pivoting the anchoring point about the front articulation so as to move the anchoring point away from the midplane of the work unit.