The haymaking device has a frame having a main beam which extends in a longitudinal direction and defines a longitudinal center line, and two side arms extending on both sides of the main beam, wherein the side arms each carry at least one crop processing tool and are at an inner end hingeably connected to a slide connection which is slidable there along the main beam, wherein the side arms are movable between a transport position, in which they substantially extend along the main beam, at a first angle to the main beam, and an operative position, in which the side arms extend at a second angle, larger than the first angle, from the main beam, wherein the side arms are movable between the transport position and the operative position by a sliding movement of the slide connection along the main beam.