The invention relates to a side strut for a lower steering arm of a three-point attaching device of a tractor. The strut includes a first articulating telescopic member secured to the tractor and a second articulating telescopic member secured to the lower steering arm. The two telescopic members are adjustable relative to one another along an axis of adjustment between an inserted position and a maximum extracted position. The side strut further includes a locking pawl which is attached to one of the two telescopic members. The pawl is pivotable around an axis intersecting the axis of adjustment at right angles. The pawl includes two parallel cheeks arranged at the sides of the two telescopic members and connected to one another by a bridge. The side strut also includes two locking stops which extend transversely relative to the axis of adjustment. The stops project from the other of the two telescopic members and are form-fittingly embraced by locking recesses when the locking pawl is in a locking position.
Side struts are known from DE 41 18 683 C1, issued May 27, 1992. In the case of the embodiment described therein, the movement between the telescopic members is limited by a longitudinal slot in the two cheeks of the locking pawl.