The purpose of work – development of practical recommendations for modernization of hydraulic cylinders, widely used in irrigation and drainage and other agricultural equipment design created at the invention level (RU2702205) and the calculations to substantiate its basic geometric parameters. Research methods – to achieve the goal, a modern method of calculating the forces created by the magnetic fields of permanent magnets used in sealing devices of hydraulic cylinder rods was used; practical recommendations are given on the need to use such devices in practice. Research results and novelty – research results are recommended by both domestic and foreign research institutes, design and production structures of agricultural engineering for further study, refinement and its possible practical implementation. Conclusions – analyzing the proposed directions for the modernization of sealing devices of hydraulic cylinder rods, it can be concluded that the developed technical solution allows to increase the operational reliability of hydraulic equipment not only for irrigation and drainage, but also for other purpose of agricultural machinery.