Sturdy track marker for D9 "Combi"

Hydraulic cylinders move the track markers of the D9 "Combi" from the working position to the vertical idle position. This enables sowing to be carried out at field boundaries and allows obstacles to be negotiated. When the track markers are switched over, the tramline controls continue to operate, in order to create tramlines at the desired speed. The track markers are protected from damage by shear bolts.