The present invention provides a pick up assembly (10) for an agricultural machine (100) comprising: a pick up drum (12) rotatably mounted in a frame (16) a windguard (18) mounted at a free end of two lateral support arms (20) the two lateral support arms (20) being pivotably mounted at their other end to the frame (16) a crossbar (26) comprising a plurality of tines (24) mounted at one end to the crossbar (26) the crossbar (26) being pivotably mounted to the two lateral support arms (20) for allowing a range of free movement of the free extremities (28) of the tines (24) between an upper limit and a lower limit. The pick up assembly (10) further comprises two elongate flexible tension elements (32 34) connected at one end (321 341 ) eccentrically to the crossbar (26) and at their other end (322 342) to the frame (16). The two tension elements (32 34) being configured such that they control respectively the lower limit and the upper limit of the range of movement of the tines (24) in function of an angle of rotation (a) of the support arms (20).
