Abstract
The developed 3D model for determining the limiting states of the metal grader construction and the mathematical model for determining forces arising on the working body and wheels during the operation of the grader allows comparison of the new designs revealed with the traditional grader designs. Moreover, the article allows assessing the stress-strain state of the motor grader, depending on the new design provisions. In the presented work, a comparison of the stress-strain state of the metal structure of the motor grader produced by DORMASH CJSC and the new design, protected by invention patent, was made. The article developed a method for determining external power factors on the working body and the motor grader engine; additionally, their influence on the stress-strain state of the metal structure of the motor grader. This technique allows finding and evaluating the most realistic design positions of the grader, in addition to already adopted.