Logistics problems carried out by sales and marketing companies operating in agricultural sector were presented. Research results and their analysis with regard to selected group of spare parts, which were indispensable to both guarantee and after guarantee services of Zetor tractors, were submitted. The research was conducted in Service Department of authorised tractors distributor. A research cycle covered the period 2003-2005. The results were elaborated statistically by determining seasonal index value. Temporal schedules of the amount and value of purchased spare parts were analysed with regard to the calendar of agricultural procedures advisable for crops cultivation in Poland.