Abstract
Knowledge about the safety of agricultural machines can be useful for reducing the physical damages and financial losses incurred by the farmers. In this study, VisualNastran desktop software was used to analyze the mechanism of three-point hitch in MF-285 tractor. Two different load cases (lifting a usual plow and maximum hydraulic lifting capacity) were studied. Neither accidental nor exceptional load cases were examined here. The finite element method was used to estimate the stress distribution and factor of safety of lift arm in SolidWorks software. The FEA results show that the maximum values of the von MISES equivalent stress for both examinated load cases are, respectively, 79 and 367 Mpa for lifting a usual plow (500 kg) and maximum hydraulic lifting capacity (2230 kg). The lift arm is safe enough for lifting of a usual plow but it may be failed when the three-point hitch works with maximum hydraulic lifting capacity. It is recommended to revise the design and construction process of the lift arm or limit the lifting capacity to 1430 kg weight.
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