The ensuring of a continuity and a quality of the production leads a part of organisations to think about the status quo of maintenance of their equipment. The maintenance also depends on types of spare parts. The management often perceives only production characters. However, current knowledge points to a deeper interdependence. This article describes practical experience with maintenance issues. The relationship of materials of spare parts and the origin of nonconformities of a production is seen as a significant one and it puts these facts into context. The reducing of costs plays a role mainly in many organisations. This factor leads to the increase of nonconformities in spare parts themselves and elsewhere in organisations. This topic of the article is embedded in the context of knowledge from steps of example of implementationof the Industry 4.0 in the organisation. The result is several recommendations for organisations in the maintenance of the equipment.