The core activity of Keller Landmaschinen AG includes the trade in agricultural machinery and vehicles, including spare parts, accessories, lubricants and fuels, as well as the operation of a repair workshop and a mechanical workshop. In addition, the company also develops and manufactures its own products, such as mower bars, motor mowers and transport trailers. The sale of agricultural technology, small equipment and municipal technology, as well as the sale of used machinery, is also part of the company's core business.