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The paper deals with the factors of the possible reasons for the deterioration of the functional characteristics of a career crawler excavator, identifying such factors as “machine - career excavator”, “personnel – excavator drivers”, “materials” and “external environment” as well as secondary causes, main aspects of these factors. The reasons for the failures of the career excavator stick in the conditions of the ore deposits of the Southern Urals are established. It is shown that the greatest number of failures is associated with excavator drivers’ low qualifications and insufficient experience.

Determination of the possible causes factors of the functionality impairment of the career excavator