Comparison of Constant and Adjustable Drawbar for a Domestic Horticulture Tractor

In this study, adoption study of drawbar pull from constant height to adjustable height was investigated for improving mechanical structure, increasing efficiency of fuel consumption, decreasing slippage of domestic horticulture tractors. Materials were a horticulture tractor, an orchard sprayer, speed measurement sensor, load cell and fuel consumption. New drawbar which connection height of implements can be adjustable was designed and manufactured for horticulture tractor. Constant height drawbar and adjustable height drawbar were compared for pulling force, forward speed and fuel consumption by using orchard sprayer. Tests were carried out for 2 km, 1 hour, 3rd gear at 2500 rpm of engine. Forward speed was determined as 15 km/h for drawbar pull test and fuel consumption tests. According to the fuel consumption results; the adjustable drawbar was better than constant drawbar 0.29 l/h on soil and 0.34 l/h on concrete surface. Forward speed with adjustable drawbar was faster than constant drawbar as 1.7 km/h for field and 2.0 km/h for concrete surface. Drawbar pull of the adjustable drawbar was less than constant drawbar 36.58 N on concrete road and 74.29 N in soil surface even there wasn't any problem for pulling sprayer. Work was performed with less drawbar pull and less fuel consumption. Adjustable drawbar suggested to manufacturer for investigated horticultural tractor because of its advantages due to constant drawbar.