Mounted disc mower KDN-210 is designed for mowing natural and sown grasses, including high-yielding and lodged ones, with laying the mowed mass in a swath or windrow in the field. The KDN-210 mower is aggregated with tractors of traction class 1.4, which have a rear hitch of the NU-2 type, hydraulic system outlets and a power take-off shaft (PTO) with a rotation speed of 540 rpm.