The use of tractors to do agricultural works showed an important role to mechanized agricultural sector. A repairable mechanical system (as agricultural tractor) is subject to deterioration or repeated failure. In this study, the regression model was used to predict the failure rate of MF285 tractor. The machine failure pattern was carefully studied and key factors affecting the failure rate were identified in five regions of Khouzestan province. The data obtained from farm records by using questionnaire was grouped in six sub-groups according to annual hour used and the way that tractors were stored. Results showed that different annual hour used and storage policies have slightly affected failure rate. As increasing in the age of tractors, failure rate in the 1050-2000 annual hour used and outdoor storage sub-groups were higher than 200-1000 annual hour used and shed storage sub-groups. At the first age, the slope of the curve in the 200-1000 annual use hours gradually increased and then quickly rose, but failure rate in the 1050-2000 annual use hours from the beginning was high and increasing in this value was almost uniform. As a result, it can be said that with increasing in the annual use hours, MF285 rapidly exposed by failure and breakdowns, but maintenance conditions slightly affected failure rate of tractor.
کلید واژگان :failure rate, MF285 tractor, machine availability, Khouzestan
ارزش ریالی : 350000 ریال
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