STUDY AND OPTIMISATION OF THE PARAMETERS OF THE LOGISTICS SYSTEM OF REPAIR SERVICES AND SPARE INVENTORY.

Machinery in agriculture is down on average 30-35% of the time due to technical failures and despite increased production of spare parts, the planned normative needs are still not met 100%. This is the result not so much of insufficient parts production as of problems in correctly determining the number of spare parts required by nomenclature. Too often a given set of spare parts is in short supply in one year and there is no demand the next. In this context, issues related to the determination of spare parts inventories, taking into account the level of reliability, operating conditions and repair of machinery, are becoming increasingly relevant. The object of the research are grain harvesters and agricultural machines of the European Union countries working in agricultural farms, included in the perspective programs of companies and organisations for mechanisation of processes in agriculture. In the publication the research of the influence reliability indices and the characteristics of the failure flow of the elements of grain harvesters produced by the companies Klaas and Amazone, which are applied in agriculture, is carried out. These machines are included in the country's perspective programs aimed at improving and increasing the efficiency of crop production in Bulgaria. [ABSTRACT FROM AUTHOR]