Studies show that due to variability of physical and mechanical properties of the soil, hard lumps are formed when carrots are harvested by diggers and remain inseparable from the tubers complicating the sifting process, which leads to overloading of machines. A lattice loosening working part that improves the separating ability of the digger elevator has been developed. The research objective is to seek rationale for the parameters of the lattice ripper of the carrot digger, which ensures a uniform distribution of the soil pile along the width of the elevator and improves complete separation of impurities with minimal damage to root crops. (Materials and methods) The study looked into the geometrical, kinematic parameters of the lattice ripper of the carrot digger. After investigating the physical and mechanical properties of the carrot bed, the research could provide theoretical rationale for the design parameters of the mechanism and its kinematic indicators. (The research results and analysis) It has been found that when the lattice cultivator interacts with the soil layers on the elevator, soil clods get destroyed and the soil gets loosened at the following parameters: the radius of the cultivator - at least 9.5 centimeters, the height of the shaft - 20 centimeters, the loaded part of the foot of the cultivator - 6 centimeters, the width of the grid ripper - 47 centimeters. (Conclusion) It has been revealed that lattice rippers help separate carrot root crops quickly from the soil layer without any damage or loss. It appears that the rotation speed of the grid ripper should not exceed 2.5 meters/second, the kinematic mode of the intensification agent of separation - 2.5, and the radius of the ripper should be at least 9.5 centimeters.