Each manufacturing plant wants to operate their production systems and devices in a reliable manner. What organizations do not want, are manufacturing systems and process collapsing, leading to production of defective or malfunctioning products. Failures will be reflected, for example, in losses of quality and productivity. One of the most important aspects of well-organized production is machinery maintenance. This article deals first with maintenance as a phenomenon in a manufacturing company, the second part of the article illustrates a practical implementation of a CMMS system.