Yes. Incomplete machines (a combination of parts of machinery which can not in itself achieve a specific application) also fall within the scope of the Machinery Directive 2006/42/EC. This means that incomplete machinery must be CE marked and must undergo the same conformity assessment procedure as complete machines. 

The components also need a technical file in accordance with the Machinery Directive. The documents in this file must give an insight to the design, manufacturing, risk assessment and operation of the incomplete machines. This is necessary to assess the conformity of the incomplete machine with the applicable health and safety requirements. The components must also be accompanied by an installation manual and declaration.