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The technological deviations of manufacturing and assembly , lead to the change of the kinematic parameters and at further efforts in the kinematic pairs of the cardan joint mechanism from the component of the poly-cardan transmissions.The variation of these forces is constant in the local systems of reference of the kinematic pairs and harmonic varies in the general system of reference in which one of the axes coincides with the rotation axis.The component of the forces that acts perpendiculary on the direction this axis is a permanent source of excitation, leading to the change of their own frequencies and vibration modes at bending. In this paper are deducted the connections between technological deviations ,the excitation forces and own frequencies and vibration modes at bending and based on the results of numerical application conclusions will be drawn.

three-shafts transmission; inherent pulsation; critical speeds