عنوان مقاله [English]
Maintenance plays an important role in sustaining the reliability, availability, product quality, reducing risk, increasing efficiency and security. Hence being aware of maintenance costs and also replacement age of machines seems necessary. In this research the costs of repair and maintenance related to 24 AUSTOFT 7000 sugarcane harvester, being used in Imam Khomeini agro-industry co., has been studied. The research was carried out by collecting the costs of spare parts, wages paid for repairs, lubricant, grease and filters and also rate of annual functions of harvesters. Comparing the shares of components maintenance costs showed that spare parts play the most important role in repair costs six various mathematical models were tested by using computer software, in order to choose a suitable mathematical model, and finally a quadratic model was selected. The replacement age diagram, drawn by using amortization cost digits, capital interest, insurance and accumulated repair and maintenance costs showed that none of the machines had reached the replacement age until the year of research study. Therefore, replacement age of harvester was estimated to be between 9 and 11 years, by using the selected mathematical model and estimating the repair costs up to fifteenth life year of the machine.