Wiesław Piekarski

Analysis of Injection Systems Types Used in Agricultural Machines

Abstract The paper presents analysis of the processes taking place in fuel systems which lead to damage of injection devices in farm machines. The most frequent reasons of failure of traditional injection systems and Common Rail high pressure systems which are caused inter alia by an improper quality of diesel oil were described and discussed. Microscopic tests of the surface of worn plungers of the plunger and barrel assemby of Motorpal injection pumps used in Zetor tractors were carried out. Types of damage to elements of the injection pump and electromagnetic injectors used in Common Rail systems CP4 type based on the tests on the group of 126 on-site repairs were assessed. Repairs were made in the repair centres in Podkarpackie Voivodeship and centres dealing with repair of injection systems. Metallographic tests were carried out in the Laboratory of Materials of Rzeszow University of Technology with the use of electrone scanning microscope Hitachi S-3400N.

Analysis of Power Equipment Level on the Example of Farm Tractors in Selected Farms of Przeworsk Province

Abstract Decisions concerning investments in farm tractors is a significant problem of modern agricultural production. Ensuring efficient performance of agrotechnical treatments and a rational level of use of tractors in the aspect of exploitation costs are a derivative of the power equipment level in a farm. The paper presents studies carried out in 31 selected farms, which run production on the total acreage of 937 ha of agricultural land (AL) and exploit 70 tractors. Analysis covered information on: area of farms, number and power of used tractors, investments in technical equipment concerning purchase of farm tractors and a production profile. In the investigated farms at the average per 100 ha of the agricultural land area there was 7.47 tractors, 90% of respondents actively used subsidies available from the EU structural funds. A high energy equipment level was determined in particular in farm with a smaller acreage. Over 87% of farm used more than one tractor and the age of the third each did not exceed six years.

An Analysis of Logistic Structure of Farm Tractors Inspections and Repairs in the Aspect of the Calendar of Agrotechnical Operations@@@Analiza Struktury Logistycznej Przeglądów i Napraw Ciągników Rolniczych w Aspekcie Kalendarza Zabiegöw Agrotechnicznych

In the present article we have discussed the logistic management of services and the characteristic features of these services which constitute logistic products. We have presented the results of a research along with an analysis concerning such services as pre-sale inspections, guarantee inspections and repairs, post-guarantee repairs of farm tractors. The research was carried out at the Service Department of an authorized dealer of farm tractors and machines. The cycle of the research included the years 2003-2005. The time schedules of inspections and repairs have been analyzed in the aspect of the calendar of agrotechnical operations recommended for cultivation in Poland. ANALIZA STRUKTURY LOGISTYCZNEJ PRZEGLĄDOW I NAPRAW CIĄGNIKOW ROLNICZYCH W ASPEKCIE KALENDARZA ZABIEGOW AGROTECHNICZNYCH Slawomir Juścinski, Wieslaw Piekarski Katedra Energetyki i Pojazdow Uniwersytet Przyrodniczy w Lublinie S l o w a k l u c z o w e: logistyka, uslugi logistyczne, przeglądy i naprawy ciągnikow rolniczych.