As the pressure for companies to advance towards the Industry 4.0 paradigm increases, small and medium-sized enterprises (SMEs) still lack financial and human resources. Therefore, research should investigate how SMEs can digitalize their business operations. Through a literature review, three focus areas of digitalization in SMEs are determined: IT infrastructure, data collection and analysis, and prototyping. In combination with these, the previous literature shows that SMEs should innovate using their existing resources, consider the feasibility of their existing data, and optimize their IT infrastructure to improve their digital maturity. Moreover, companies should be able to develop their maintenance strategy by increasing their data maturity. Therefore, this paper investigates how a case company can use existing IT systems and data to advance its maintenance strategy. The results from the case study conclude that companies can indeed improve some of their maintenance activities by innovating using their existing IT infrastructure and data.