One of the main aims in the management of farm equipment and tractors is to decide their replacement, based on technical and economic conditions. The objective of this research was to determine the economic life time for John Deer3140, common in the Varamin Region of Iran. First the annual depreciation and interest were calculated considering the initial purchase price of tractor, and then the economic life was calculated based on repair and maintenance costs. Based on the results, the most suitable replacement age was obtained, which was eight years for John Deer 3140.
Key words: Economic life, replacement age, JD3140, Varamin Region.
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