Abstract
The main machine repair problem and the main hidden defects are determined. The analysis of the protocols of the machine test stations showed that the greatest number of tractor failures occurs in the final drive gearboxes. To study their quality, such spare parts as the shaft, front axle half-shaft and the gear were selected. The main physical, mechanical and geometric parameters of the investigated spare parts, necessity and reasons for high quality control for qualitative production of spare parts are considered. Controlled geometric defects, methods and means of control of transmission spare parts are determined. Means of measurement for comparison of indicators and control accuracy are proposed.
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