Abstract

                                Reliability in engineering is defined as the probability that a device will satisfactorily perform its specified function for a specified period of time under a given set of operating conditions. Reliability is thus a mathematical expression of the likelihood of satisfactory operation. Though the repair cost of tractor is high the subsequent loss due to delay in carrying out the repair is potentially much greater than the cost of repair. Under such condition any stoppage of tractor can cause sizeable loss, due to delay in carrying out the timeliness of farm operations during the peak seasons apart from inefficient labour utilization. Hence the reliability of tractor has become more important, while the breakdown of an individual subsystem of a tractor is an annoyance

Key words : Tractor, Reliability, probability density function, scale parameter, weibull slope