All agricultural machinery which constitutes any agricultural machinery system should be taken into account in terms of their operating factors for effective and profitable farm management. Reliability prediction and repair-maintenance costs are considered as the most important operating factors. It is required to make a comprehensive survey to obtain the consistent machinery reliability and repair-maintenance costs data for reasonable future suggestions that is crucial for realistic planning in management decisions especially in local conditions. Besides these, repair-maintenance costs are important portion of the total cost of owning and operating farm machinery. The costs of repair-maintenance of agricultural machinery represent almost 10-15% of all machinery costs according to average literature data.