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ADAGENG 2014 12th International Congress on Mechanization & Energy in Agriculture 3-6 Semptember, Cappadocia, Turkey. The Effect of Windscreen on Field of Vision in Tractors Hakan VELİOĞLU1, Hasan SİLLELİ2, Selçuk OLUM3, Mustafa KANTAŞ4, Hamdi TAŞBAŞ5, İbrahim ERGÜL6 1,3,4,5,6TAMTEST, Directorate of Testing Center of AgriculturalEquipmentandMachinery P.K. 22 06170 Yenimahalle, Ankara, TÜRKİYE 2Dept. of Agricultural Machinery, Faculty of Agriculture, University of Ankara hakanveli@gmail.com selcukolum@tamtest.gov.tr Abstract: Tractors are used in dusty and muddy conditions because of its functionality. However, apparatus using for increasing the field of vision in tractors can not eliminate the risks associated with these conditions. In some situations, windscreen may be entirely covered with mud and field of vision may be limited by the only part of the wipers sweep. Efficiency of tractor wipers are assessed according to the current regulations(in respect to the legislation issued by Ministry of Science, Industry and Technology). “2008/2AT Type Approval Legislation related to Field of view and windscreen wipers Agricultural Wheeled Tractors or Forestry Tractors” ( Valid in Turkey and European Countries) and/or equivalent regulation “R-71 Approval of Agricultural and Forestry on drivers’ field of vision” (valid in countries which are member of United Nations). In this study, a research was carried out on agricultural tractors equipped with a cab in accordance with aforementioned legislation. These two tractors have different track width, and they operated by three expert drivers. With reference to “Type Approval Regulations 2008/2/AT and 2009/66 related to Steering Equipment of Agricultural Wheeled and Forestry Tractors” a special 100 meters ‘S’ shaped track formed by 2 circles has been designed. Test track was formed in respect to current regulations and average rural road and its border determined as 3 and 4 meters wide by using pins. Trials were carried out in two different speeds; at constant speed and normal drive and windscreen was clear and dirty. After trials, it was observed that number of pins overthrown were variable depends on operator’s experience, track width or high clearance shape of tractor, speed and windscreen’s conditions or type. The assessment of Agricultural and Forestry Tractors in this research showed the current regulations or standardts cannot provide enough security. For that reason, it was concluded that current regulations and standards should be revised in order to be able to provide enough driving security. Key words: Field of view, wipers, driving security, tractor