A device for comminuting material components includes a housing, at least one rotor that is supported in the housing and has rotor blades and rotor teeth mounted thereon, at least one stator blade that can be supported on the housing, and at least one screen device, which can be moved from an operational state of the comminuting device downward or laterally relative to the housing to a maintenance state, wherein in the operational state the at least one stator blade and the at least one screen device are supported against each other and can be moved together into the maintenance state.