Abstract—Traditional designs of working bodies of earthmoving machines are not adapted for the development of large-block soils mudslides and other debris in emergency situations, which leads to a decrease in their productivity. Therefore, it is necessary to create special working bodies of single-bucket excavators for the development mudflows with large-block inclusions allowing to expand the functionality of these machines. The subject of the study is to determine the kinematic and power parameters mechanism extension of the special working body of the excavator on the basis analytical studies and computer modeling. The proposed method of kinematic and force analysis a special working body of the excavator: algorithms and methods of defining the position coordinates of the links; equation closure independent contours of extension mechanism special jaws the excavator bucket in a vector form to determine the angular velocities and accelerations of the links; programs for determination of numerical values of kinematic and power parameters, selection of the block diagram, calculation sizes links working body of the excavator and numerical and graphic values of parameters are received.