Abstract
This article focuses on the issue of motor oils used in the engines of non-road mobile machinery (NRMM), more specifically tractors. The primary goal of the paper is to determine the appropriate replacement interval for these oils. The physical properties of the examined samples were first determined by conventional instruments. Furthermore, the concentrations of abrasive metals, contaminants, and additive elements were measured using an optical emission spectrometer. Lastly, the content of water, fuel, and glycol and the products of oxidation, nitration, and sulfation were determined by using infrared spectrometry. The measured values were compared to the limit values. Based on the processing and evaluation of these analyses, the overall condition of the oils was assessed and subsequently the optimal exchange interval of the examined oils was determined. In addition, a risk analysis of the outage was performed. Due to the high yields of crops, farmers can lose a significant amount of product when a tractor is not functioning during the harvest period. This loss is calculated in the paper.
Highlights
The choice of suitable engine oil has a crucial effect on the operability and long-term operation of the engine
The limit values given in Tab 9. are the values set by the manufacturer of lubricating and process oils Paramo on the basis of many years of experience with laboratory analyses of oils
For long-term and trouble-free operation of the engine, it is necessary that the engine oil used meets all the requirements imposed on it
Summary
The choice of suitable engine oil has a crucial effect on the operability and long-term operation of the engine. The oil must perform several functions in the engine. It must lubricate and adhere well to the lubricated surface, protect metal surfaces from corrosion, seal the combustion chamber, dissipate heat caused by friction, ensure the dispersion of soil and prevent their settling and allow operation during extreme temperatures. If we want the engine (or the entire machine) to operate correctly for a long period of time, it is necessary to change the oil at defined intervals. The appropriate change interval is specified by the manufacturer of the machine or engine oil. Due to use, the engine oil degrades, the additives necessary for the performance of the required functions are reduced, and the percentage of undesired particles increases due to wear or the penetration of impurities from the outside [6]
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