The article notes that when plowing, the traction resistance of a ploughshare with an occipital chamfer increases in proportion to the volume of compacted soil. When working, the traction resistance of the ploughshare with the occipital chamfer increases in proportion to the volume of the compacted soil. It was revealed that with an increase in the angle of the occipital chamfer of 5 to 40 degrees, the traction resistance increases 11.3 times, Whereas with an increase in the width of the occipital chamfer from 0.5 mm to 4 mm, the traction resistance increases 60...64 times. For the longest operation of the ploughshare, it is necessary to develop such a technical solution for the ploughshare, during the operation of which an occipital chamfer with the largest dimensions, that is, with a minimum area, was formed from the back side. Then the pushing force of the ploughshare from the soil will have a minimum value, which will ensure the operation of the plough for the most maximum time without violating agrotechnical requirements for the depth of processing.