Purpose - to determine dependencies of structural parameters taking into account the impact of dynamic processes and the phenomenon of wear in movable joints of hydraulic props of powered supports to increase the life of their work. In this work, the method of analogues and the calculation method were used during fit selection, dimensional analysis was used when developing a gap formation scheme in a piston joint of a hydraulic prop of a powered support. The least squares method was used to determine the empirical dependence of movable joints of hydraulic props of powered supports on the minimum structural gap and assurance coefficient of joint mobility. A technique was developed that enables to forecast the life of movable joints and hydraulic props, in general, depending on the quality of production, operating conditions and materials of parts. Recommendations were developed that increase the efficiency of hydraulic props of powered supports. Expressions were obtained to determine the minimum and maximum structural gaps in movable joints of hydraulic props, taking into account the wave dynamics of rock bursts and the wear of surfaces of conjugated parts during friction contacts in the work process of powered supports. A procedure was developed to calculate the structural gap for forecasting the operational life of movable joints of hydraulic props.

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