Agricultural tractors produced in the twenty-first century will require high-quality services related to their servicing. The aim of the work is to obtain information on the distribution of demand in each month for maintenance services of agricultural machinery based on the service facility located in Wielkopolska Region. The paper presents the analysis of the demand for warranty and post-warranty services for farm tractors over the year. The results have been developed statistically in order to determine the period of greatest demand for service. In the form of histograms quarterly distributions of values of the demand for warranty services, guarantee services and the total number of service were presented. The results have been analysed in terms of time limits for performance of agrotechnical treatments recommended for vegetable crops in Poland.