This paper is focused on the impacts of the biodegradable hydraulic and transmission fluid (Universal Tractor Transmission Oil) on operation of tractor hydraulic and transmission systems. The fluid was used in the hydraulic and transmission systems of a Zetor Proxima 6321 tractor. Fluid samples were taken from the Zetor Proxima 6321 tractor at intervals of 250 engine hours. These samples were subjected to an infrared spectroscopy analysis in order to measure the total acid number and perform the ferrography analysis. This paper proves minimal impacts of the biodegradable hydraulic fluid on operation of the Zetor Proxima 6321 tractor. The biodegradable fluid meets the requirements for the operation of agricultural tractors in terms of low impacts on the wear of hydraulic components.

The welding of alloy steels in practice is a difficult process in order to achieve mechanically or chemically resistant high-quality welds. In some cases, the weldability of many materials can be difficult or is not recommended because of poor and unsuitable properties of welded joints. In our research work, we investigate the selection of an appropriate welding method for welding the manganese steel HS 20 used at dynamically strained components in the car industry. The welding methods have been selected from accessible methods of the KARRER, s.r.o. Tovarníky industrial plant. Based on the comparable welding technologies MMA, MIG/ MAG and TIG, we tested and verified the quality of welds by means of selected weld tests. The quality of these welds, obtained by the abovementioned methods, was evaluated by weld tests in laboratory conditions of the Department of Quality and Engineering Technologies (Slovak University of Agriculture in Nitra) in cooperation with NDB, s.r.o. Bratislava and SES Tlmače, a.s. The aim of the research work is to set the most suitable and effective method of welding for given components from all the technologies available in the mentioned industrial plant. Based on relevant information, we also want to enrich the scope of knowledge about welding of manganese materials in order to make the welding process more effective.

Taking into account vehicle safety, braking systems and their parts are subject to strict evaluation criteria not only due to market competitions of manufacturers but also from the customer point of view. The paper is focused on a subject research by comparing the qualitative properties of friction braking materials of vehicles under operational conditions considering the customer position. The research results containing the comparison and evaluation of friction braking materials could address the manufacturers who affect the product quality and complex manufacturing processes on the basis of real operational conditions. The final analysis and evaluation of braking pads was carried out on the basis of their wear directly under operational conditions by monitoring the material shortage and surface roughness of the friction material. We have selected and compared three types of friction materials within our research work which were applied to the Škoda Fabia 1,2 car under city traffic conditions. The research results lay stress on economic and qualitative indicators by selecting the correct braking pads taking into account the safety of vehicle operation.

Use of means of technical diagnostics gains in today's period increasing importance in all areas of industrial activity. Due to the tightening of the limits, software and hardware solutions improving is the diagnosis of the building one of the most important area in manufacturing and non-manufacturing organizations. The aim of the article is to clarify the possibility of using diagnostic procedures in the form of georadar to monitoring of location and status of reinforcement in a ferroconcrete bearing wall. For measuring was used radar system Mala CX12 with accessoriesand based on selected aspects has been diagnosed the exact location and status of the construction reinforcement. The result of this monitoring is to detect variations in the position of reinforcement and recorded corrosive damage. We investigated the humidity of concrete wall through the diffusion of EM waves while the evident product of decrease of the diffusion speed was the increased moisture of structure.The main outcome is to propose corrective measures in the form of the concrete carrying wall remediation necessity, as indicated by the results of this monitoring. By early use of the diagnostic means in the form of monitoring using georadar, it is possible to prevent the economic and environmental impacts.

Every car needs for operation, if possible, the highest quality fuel. Fossil fuels produced from crude oil by conventional technology are being increasingly replaced by alternative fuels. It is caused by new technologies that allow combustion of such fuels and, at the same time, provide economically more efficient operation of cars. From the perspective of ecology, they are also of great importance when it comes to meeting the strict emission standards of the European Union. The experiment compares two types of alternative propulsion with LPG and CNG at selected makes of Fiat cars with 1.4 litre engines. These engines can also utilize conventional fuels – petrol and are mass-produced directly from the factory. The measurements themselves were carried out during predetermined driving cycles such as urban, extra-urban and highway. All the three categories of measurements were carried out under normal driving conditions in a standard manner in compliance with all traffic regulations. Based on all measurements obtained from both engines with LPG and CNG propulsion, we found that the car with the LPG engine became economically more advantageous. The benefit was found in expenses return with this system as well as in measured consumption, prices and availability of filling stations.