Purpose. To study possible variants of assemblies of the fourth class Assur group consisting of four links and to evaluate their impact on operation of the mechanism containing this Assur group. Methodology. The paper shows the results of theoretical study of possible assemblies of the fourth class Assur group in a jaw crusher in which both jaws move. The study was carried out with the help of the MathCAD software. Findings. It is shown that the planar fourth class Assur group used in the jaw crusher features the following: only two assemblies are possible for conventional configuration of three-joint links against the frame; assembly mode significantly affects the quality of the crushing process; assemblies can be located very close, which can cause spontaneous transition from one assembly to another in heavily loaded mechanisms and result in an emergency situation. Originality. It has been established that in the planar fourth class Assur group the number of possible assemblies does not exceed two. Very close mutual arrangement of assemblies is possible. Position functions of mechanisms with different assemblies differ from one another. Practical value. The action algorithm is proposed. Used at synthesis of planar mechanisms of the fourth class, it allows evaluating their possible assemblies.

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