The Mower- conditioner is intended for cutting grass with simultaneous crushing of plants and laying them in swaths on the ground.

The mower may be used for grass cutting without crushing; in this case the mass is packed into swaths. It's suitable for harvesting hay, legiminous crops and cereals.

The mower is unified with grass mowers, manufactured by Production Group "Gomselmash".

The pinless cutter design makes possible using mower KPP- 4,2 for mowing the second and subsequent hay- crops.

For road transportation purposes the unit is equipped with fast shifting mechanism.