The aim of this final thesis is to further explore the impact of lubrication on the friction of sliding bearings in military equipment. In the introductory section, readers are introduced to the importance of proper lubrication, which initially contributes to the extended lifespan of military equipment and supports its operation. To determine the type of lubricant to be used, the first part of the thesis focuses on identifying the types and causes of friction. The second part describes the consequences of friction, particularly related to sliding bearings, which are the main focus of this study. Furthermore, modern types of lubricants manufactured under the ISO 9001 quality program are mentioned, followed by a discussion of lubrication theory that recognizes specific types of lubricants and their utility. The final part presents specific examples of wear in sliding bearings and the damage caused by the fracture of a ball bearing in the 122 mm self-propelled howitzer engine, known as the 2S1 "Gvozdika." This is followed by an examination of friction in the presence of lubricants, effectively concluding this study.