The Topturn X4500 is a compost turner for triangular windrows which turns and aerates while driving by means of a centrally located, generously dimensioned rotor and assures high performance in all work situations. Particular design features are the robust, triangular frame and the centrally located cabin which can be lowered hydraulically for transport and maintenance. The cabin is spacious; operation of the information system is intuitive, thanks to a large colour display.