The stability of moulder stroke affects the uniformity compaction of soil ridge. It depends on the mounting system of molder to the frame and the direction of act-ing forces on them. The aim of the study is to analyze the stability stroke of cot-ton seeder molder. The longitudinal stability of molder in a fixed system of coordinate dependency on acting forces on it, as well as its constructive parameters, have been considered. There has been obtained the equation for the determination of angular deviations of leads of parallelogram fastening system from the initial position under the influence of applied to the moulder forces, constructive parameters of sections, and unevenness of soil surface. It has been established that the fluctuation of links of the parallelogram mechanism is mainly influenced by the weight of mass of moulder system, soil resistance forces, the initial angle of links inclination and force pressure of the spring group. The stability of moulders work is ensured mainly by changing due to the changing force pressure of the spring group.

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