The book is a textbook for rural vocational schools. This is the first time such a textbook has been published. It sets out the main tasks of technical diagnostics, gives the characteristics of methods, means and systems for monitoring the technical condition of machines, considers the issues of predicting their technical condition, describes methods and means for diagnosing tractors, indicating the nominal, permissible and limit values ​ ​ of state parameters, gives methods for performing adjustment operations, gives recommendations for organizing technical diagnostics.