The paper is an attempt by the authors to put together some of the modern concepts of the technical and economic development that are becoming increasingly important especially in the industrial field. In this sense, the predictive maintenance applied in the field of hydraulic drives and its integration in the circular economy and in Industry 4.0 are analyzed first of all, along with reliability and mechatronics. The connecting elements of all these technical-scientific fields are the defect and the behavior in time of the hydraulic installation. The paper presents some of the works performed in the laboratories of the Institute as well as the modern methodologies applied by IHP specialists in the process of the predictive maintenance applying in the hydrostatic drives on the industrial equipments.