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A solution technique and calculation algorithm have been developed in order to establish the dependence of the stress state of the transmission mechanism with three internal and one external pulleys.The formulation and solutions of the problems of rotation of a stretchable and non-stretchable belt of a transmission mechanism rotating in stationary mode with a given speed are given.The problem, in the case of belt stretching within the limits of elasticity, is reduced to the numerical solution of a system of four algebraic equations with respect to deformations of belt branches.In the case of an inextensible belt, the dependence of the value and the law of tension distribution between the free-from-contact branches of the belt on the material properties, design and technological parameters, as well as the rotation speed of the mechanism, convenient for conducting fitting studies, was obtained.Separately, the task of calculating rational initial (adjustment) parameters set when preparing the mechanism for operation.

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