Calculation of the resource and the number of spare parts based on the results of incomplete tests

Methodical provisions for determining the value of the spare parts use for the average life of parts and components of the forest machine, determined from the data of incomplete machine testing according to the plans [NUT] or [NUr] and tested on the details of the tractors of the Onega Tractor Plant are presented in the article. The initial data for the calculations were samples of statistical data on the operating time to the limiting state of the details of forest machines. Calculation of spare parts use according to the [NUr] plan under the normal distribution law of resource for 43 tractors of the Onega Tractor Plant was carried out. This technique may be used for other forest machines, including foreign ones.