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This article notes that most of the soil-cutting working bodies wear out their socks a lot, as a result of which their limiting state is reached. Despite the fact that other parts of the working body are still workable and the stock of metal for wear is still sufficient, the working body is completely rejected. In this regard, it is emphasized that increasing the durability of the nose parts leads to an increase in the durability of the entire working body. To determine its parameters, the condition for leveling the resources of socks and other parts of the soil-cutting working bodies is considered. When determining the length of the nose of the bits, an analytical dependence is recommended, taking into account the geometric parameters of the bit and the plowshares welded to it. To obtain self-sharpening in the process of bit nose wear, it is recommended to use a new two-faceted profile. The rational values of the length, the angle of the wedge and the sharpening of the nose are determined, equal to 90 mm, 100 and 350-400, respectively. Based on the condition of rational combinations of strength and self-sharpening characteristics of the toes of bits, the thickness and width of the latter were determined, equal to 22.3 mm and 30 mm, respectively.

In cotton growing, three-wheeled tractors are used for inter-row processing of cotton. Despite good agrotechnical permeability, they have significant specific disadvantages associated with low resistance, the impossibility of using them for transport work and, most importantly, a negative technogenic impact on the soil. To eliminate these shortcomings of a three-wheeled tractor, “DTCAE LLC” developed a design for a four-wheeled tractor with adjustable ground clearance. Clearance adjustment, which is carried out by a screw mechanism, selected in such a way that the force of the operator would be sufficient to create a torque to drive it, but at the same time there would be no spontaneous rotation of the screw under the influence of axial force arising from the gravity of the tractor. The article presents a method for calculating the parameters of a screw-nut pair, which excludes spontaneous rotation of the screw under the influence of axial force arising from the gravity of the tractor and thereby ensures the reliability of the screw mechanism for adjusting the tractor clearance.