Аннотация:A planar kinematic scheme of the manipulator with three degrees of freedom of the links is proposed. Manipulator links are statically determinate trusses. The connection of individual links is carried out using elements with variable lengths, such as hydraulic cylinders. It is assumed that the mass of the structure is concentrated in the nodes. Each massive node has two degrees of freedom. The first natural frequencies of the system oscillations are calculated depending on the position of the manipulator links.