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Abstract: The worldwide rotary pump market was estimated at around $5000 million in 2020 andthe market is supposed to increase by 20% toward the end of 2026, seeing a compounded annualgrowth rate of 3% over a period from 2022-2026. The scrapping of an engineered component made from non-renewable resources at an early stage in life due to wear goes against the ethics of theconservation of natural resources as the frictional processes lead to dissipation of a part of inputenergy. In this context many research works focused on analyzing wear behavior using various for mulated and vegetable oils but no works investigated on using hydraulic oils as lubricant forwear preventative nature. The objective of the work was to obtain diamond-like carbon coating onhigh-speed steel samples and test them for better wear preventative behavior with differenthydraulic fluids. The HSS ball sample of 12.7 mm diameter were used as a substrate on which the dlc coating was to be developed using then RF-PECVD technique. The developed DLC coating wascharacterized by conducting X-Ray diffraction which suggested the coating to be of amorphousstructure, Raman spectroscopy which determined the content of graphite (sp2 ) to be 47% and thatof diamond (sp3 ) to be 53%.Further nanoindentation was conducted to compare the hardness ofthe high-speed steel sample before and after coating which was 12.22GPa and 35.56GPa respectively. The four ball test was performed to investigate the anti-wear properties of lubricatingoil at specific conditions such as higher load, controlled temperature and constant rotating speed ofthe ball as per the ASTM D4172. The four ball results show that the coefficient of friction forsamples reduces by around 36% when test oil 3 is used in uncoated samples and 48% in coatedsamples. Also, the wear rate for the test oil 3 for coated samples was found to be 0.7381x10-6 mm/Nm, which is the lowest wear rate among the other test oils. The outcome of the project is thereduction of coefficient of friction by 84% with respect to dry condition when test oil 3 is used.Therefore, it can be deduced that test oil 3 stands out as the most effective lubricant among the trioof test oils.In this direction , further work can be carried out by carrying out four ball tests withlubricant oils in combination with additives to it so as to enhance the base oil property and suppress undesirable base oil properties. Fabrication and manufacturing of the vane model can bedone to validate the result with the help of experimental work.