The article presents the results of the study of the accuracy parameters of the manufacturing of gears for hydraulic gear pumps of group 1. The relevance of the work is due to the high requirements for the accuracy of the geometric parameters of the gears, which ensure the efficient operation of the pumps, minimising leakage and power losses. The study considers the main errors that occur in the manufacture of gears, in particular deviations in profile, pitch, concentricity and side clearances. The influence of these errors on the hydromechanical parameters of the pumps, including efficiency, noise level and wear resistance, is analysed. Modern methods of accuracy control, such as optical and contact profilometry, have been used to provide a quantitative assessment of the accuracy parameters. On the basis of the results obtained, recommendations for improving the technological processes of gear machining, including the optimisation of shaving and finishing, are proposed. The article also discusses the influence of heat treatment modes on the accuracy and stability of geometric parameters of gears. The analysis of the gear teeth of Group 1 gear pumps by chamfering shows that this method can significantly improve the accuracy of the geometric parameters of the teeth and the quality of their surface. This reduces the roughness of the profile, which has a positive effect on the contact life and performance characteristics of the parts. Shaving also helps to reduce the level of residual stress in the surface layer of the teeth, which increases their resistance to fracture during metal fatigue, especially under variable loads. As a result of the study, the following results were obtained: in fact, the 7th to 8th degree of accuracy according to DIN 3962 is achieved after chamfering. The greatest difference in the indicators is in the accumulated error of the steps and the radial runout of the gear ring. The results of the study can be used to improve the efficiency and reliability of hydraulic gear pumps, which is important for the fields of mechanical engineering and hydraulic engineering.One of the important issues in the development of mechanical engineering is to improve the efficiency of the functional performance of various mechanisms, including hydraulic gear pumps and motors. Special attention should be paid to the following indicators.

shovel, gearbox, gear, gear hydraulic pump, precision

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