Abstract: The invention relates to a positive control especially radial piston motors for hydrostatic motors. Such control, while permitting a large range of rotational speed, is capable of avoiding disturbances in the oil flow occurring during coverage of the edges of includes slide valves and provides optimum smoothness of operation of the hydrostatic drive. It is the object of each slide valve to control the connection between an associated working cylinder and the inflow and outflow of the pressure medium. It is a further object of the slide valve to establish connection between the associated working cylinder and a pressure equalizing conduit, at least during coverage of a first pair of control edges, i.e. in a phase during which the working cylinder is cut off both from the pressure medium intake and from the pressure medium outlet. For this purpose the slide valve is provided with a second pair of control edges.