Organization of technical service of machines under zone operating conditions provides for the possibility of determining the list of units exposed to climate effects and the estimation of zone correction factors to the consumption rates of spare elements during repair and maintenance [1].

The article considers the process of developing diagnostic mathematical models that take into account the influence of the hydraulic density of the plunger pair associated with wear. To estimate leaks of precision parts, methods for calculating the cycle feed for wear of plunger pairs are presented. The position of the cut-off edge relative to the hole changes due to the injection movement and rotation of the plunger during the regulation of the fuel cycle. The method and results of accelerated testing of plunger pairs are also presented.

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When solving the problems of increasing the reliability of automotive and tractor equipment during the regular repair period, a problem of adjusting the norms of the need for spare parts appears. The lack of recommendations for their determination, depending on the operating conditions, determines the need to deepen the analysis, development and refinement of techniques in order to clarify and adjust the normalizing factors.

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