Bout markers for D9

The bout markers of the D9 Special are lifted up to the horizontal position or lowered with the aid of a hydraulically actuated marker changeover. Actuation by a single-acting tractor valve allows the hydraulic tramline control to advance at every changeover.  On the D9 Super  hydraulic rams lift the bout markers from the operational position into the vertical transport position. This allows sowing on headlands and the convenient negotiation of in-field obstacles. When the bout markers are switched over, the tramlining control advances automatically to create tramlines in the desired rhythm. The bout markers of the D9 Super are protected against damage via shear bolts. .