Agricultural Engineering, Volume 50 (2018)


Edgardas Andrianovas, Juozas Padgurskas
Aleksandras Stulginskis University


The research aim is to analyze the reliability of off-road vehicles, to determine the factors affecting it, and to provide recommendations for the increase of reliability. Factors allowing to improve their reliability were found by using the repair paper analysis, the questionnaire of the garage employees, and the empirical research of vehicles. The results revealed that the Central Tire Inflation System (CTIS) is the weakest system in off-road vehicles, which in turn requires a deeper investigation. Increasing the reliability of the CTIS makes the vehicle more reliable. Important conclusions were made about the CTIS: sealing elements are not affected by air pressure, but changing their sides may cause breakdown, the clearance of air directly affects reliability, the system can break down even when it is not used in the vehicle. Recommendations for the increase of reliability of pre-existing vehicles are as follows: not to change the side of the sealing element when repairing, the cleanliness and dryness of the air in the CTIS must be ensured by changing the air dehumidifier once a year and releasing water from the air drain valves; also, special training and instructions relating to the CTIS should be provided for garage employees.

Keyword(s): reliability, off-road vehicle, limiting factors


A.Amrazevičius, Lietuvos transporto sistema, Vilnius, 2008.

B.Bertsche, Reliability in Automotive and Mechanical Engineering, 2008.

J.Francis, Air Quality Standards ISO 8573.1 & ISO12500. The hyperlik:

H.Medekšas. Gaminių kokybė ir patikimumas – Kaunas, Technologija, 2003. – 279 p.

V.Mickūnaitis. The qualiy of motor cars and is variation times // Transport. – 2004, Vol XIX, No 4, p. 177–179.

SISU AXLES, Additional instructions for axles equipped with CTI-System, 2008, p.1, Picture 2. The hyperlink:

I.Višniakas, K.Slivinskas. Patikimumo teorija, Vilnius, 2005. P.90.

Zhang Y. M., Yang Z. (2009) Reliability-based sensitivity analysis of vehicle components with non-normal distribution parameters., International Journal of Automative Technology, Vol. 10, No. 2, pp. 181-194. DOI: 10.1007/s12239−009−0022−4

Zhang Y. M. Reliability-based robust design optimization of vehicle components, Part I: Theory, Higher Education Press and Springer-Verlag Berlin Heidelberg, 2015, 10(2): 138-144. DOI:10.1007/s11465-015-0333-2

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Agricultural Engineering ISSN 1392-1134 / eISSN 2345-0371

This journal is published under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License. Responsible editor: Dr A. Žunda.