A bulldozer, like many building, road, agricultural and other machines and mechanisms has a working unit supporting wheels, tracks or skis. All of them have a late feedback in kinematics scheme. In contrast other the bulldozer in kinematics chart has a late feedback with amplification factor of k >1. Thus insignificant change of position of supporting units or shovel, cause a considerable change in the depth of treatment. Number of research works revealed that this transitions period described by an arc, and a circumference.