Evaluation of the efficiency of maintenance of quarry excavators by the share of repair downtime

This article presents the results of an analysis of data from monitoring the technical condition and maintenance and repair work performed on EKG-20 open-pit copper ore mining excavators in the open pit mines of the Republic of Uzbekistan. The article focuses on the impact of maintenance and repair (M&R) strategies on equipment reliability and performance. A M&R coefficient reflecting the ratio of scheduled to emergency repair downtime is proposed, which serves as a criterion for assessing the effectiveness of the M&R system. Based on excavator monitoring data, the average M&R coefficient was determined for the M&R strategy adopted at the quarry. This coefficient indicates the level and quality of equipment technical condition management. Failure distribution patterns and monthly operating time of excavators are established. A rationale is provided for the conclusion that increasing the proportion of scheduled activities reduces the likelihood of unscheduled downtime; however, their effectiveness depends on the intensity of operation and the quality of work organization. The conducted study allows us to quantitatively characterize the M&R coefficient for excavators and identify statistical patterns reflecting their actual condition and reliability. The study substantiates the choice of a combined maintenance and repair strategy integrating elements of predictive analytics and the CM&R (Conscientious Maintenance and Repair) concept, which optimizes costs and improves equipment reliability. The obtained data can be used to develop adaptive systems for managing the technical condition of excavators in challenging mining and geological conditions.

Salimov A. E., Ivanov S. L. Evaluation of the efficiency of maintenance of quarry excavators by the share of repair downtime. MIAB. Mining Inf. Anal. Bull. 2026;(5):52-65. [In Russ]. DOI: 10.25018/0236_1493_2026_5_0_52.

A.E. Salimov¹, Graduate Student, RINC Author ID: 1282219, SPIN-code: 7110-2744, Scopus Author ID: 59198498200, e-mail: salimoff.abbas@gmail.com,
S.L. Ivanov¹, Dr. Sci. (Eng.), Professor, RINC Author ID: 615961, SPIN-code: 4430-7239, Scopus Author ID: 56673503800, WoS Researcher ID: T-4762-2019, ORCID ID: 0000-0002-7014-2464, e-mail: Ivanov_SL@pers.spmi.ru,
¹ Empress Catherine II Saint Petersburg Mining University, 199106, Saint-Petersburg, Russia.

A.E. Salimov, e-mail: salimoff.abbas@gmail.com

1. Safiullin R. N., Katsuba Yu. N., Ungefuk A. A., Khisamutdinova E. L., Khokhlov A. V. Bootstrap method for monitoring the safety of traffic control systems of highly automated mining machines. Russian Mining Industry Journal. 2025, no. 1S, pp. 73—80. [In Russ]. DOI: 10.30686/1609-9192-2025-1S-73-80. 

2. Safiullin R., Arias Z. Comprehensive assessment of the effectiveness of passenger transportation processes using intelligent technologies. The Open Transportation Journal. 2024, vol. 18, article e26671212320514. DOI: 10.2174/0126671212320514240611100437.

3. Khamidov O. U., Shibanov D. A. Regulated maintenance and repair of quarry excavators considering real-world conditions and operating modes. MIAB. Mining Inf. Anal. Bull. 2025, no. 12-3, pp. 152—167. [In Russ]. DOI: 10.25018/0236_1493_2025_123_0_152. 

4. Khoreshok A. A., Dubinkin D. M., Markov S. O., Tyulenev M. A. On changes of efficient productivity of excavators when using dump trucks with different body capacity. Bulletin of the Kuzbass State Technical University. 2021, no. 6(148), pp. 85—93. [In Russ]. DOI: 10.26730/1999-4125-2021-6-85-93.

5. Zhuravlev A. G., Glebov I. A., Cherepanov V. A. To the question of increasing productivity and technical readiness of powerful domestic excavators. Problems of Subsoil Use. 2023, no. 4, pp. 76—88. [In Russ]. DOI: 10.25635/2313-1586.2023.04.076.

6. Grabsky A. A., Sergeev V. Yu., Grabskaya E. P. Justification of the choice of the strategy of maintenance and repairs of the open-pit excavators. Ugol'. 2021, no. 2, pp. 14—17. [In Russ]. DOI: 10.18796/0041-5790-2021-2-14-17.

7. Korshunov G. I., Mironenkova N. A., Chizhov O. V., Poleshchuk A. A. Analysis of results of radon surface survey using the example of the Kuznetsk coal basin mine. Occupational Safety in Industry. 2025, no. 11, pp. 81—86. [In Russ]. DOI: 10.24000/0409-2961-2025-11-81-86.

8. Rakhutin M. G., Zang K. K., Krivenko A. E., Chan V. H. Assessment of the impact of working fluid temperature on power losses in a mining hydraulic excavator. Journal of Mining Institute. 2023, vol. 261, pp. 374—383. [In Russ].

9. Maksarov V. V., Efimova M. V., Filipenko I. A. Selection of the process parameters of magnetic abrasive polishing for edge treatment of aircraft hull parts made of aluminum alloys. Tsvetnye Metally. 2024, no. 3, pp. 78—84. [In Russ]. DOI: 10.17580/tsm.2024.03.11.

10. Lukashuk O. A., Stroganov Y. N., Velikanov V. S., Dremin A. V. Investigation of the influence of modernization of the bucket of excavator EKG-20 on technical and operational performance. News of the Tula state university. Sciences of Earth. 2024, no. 4, pp. 284—293. [In Russ].

11. Komissarov A. P., Shestakov V. S., Lukashuk O. A., Khoroshavin S. A. Lever mechanisms of quarry excavators. Actual problems of improving the efficiency and safety of mining and oilfield equipment operation. 2019, vol. 1, pp. 21—27. [In Russ].

12. Velikanov V. S., Grishin I. A., Lukashuk O. A., Degodya E. Yu., Telminov N. S. Study of the stress-strain state of the working body of a quarry excavator under dynamic loads from the granulometric composition of rocks. Ugol'. 2024, no. 12, pp. 103—107. [In Russ]. DOI: 10.18796/0041-5790-2024-12-103-107.

13. Salimov A. E., Shibanov D. A., Ivanov S. L. Failure risks of mine excavator associated with its maintenance and repair. Russian Mining Industry Journal. 2024, no. 2, pp. 97—102. [In Russ]. DOI: 10.30686/1609-9192-2024-2-97-102.

14. Gericke P. B., Gericke B. L., Shakhmanov V. N. Selection and justification of the criterion for diagnostics of misalignment of shafting shafts of quarry excavators. Technics and technology of mining. 2021, no. 3 (14), pp. 50—60. [In Russ]. DOI: 10.26730/2618-7434-2021-3-50-60.

15. Shojaee Barjoee S., Rodionov V., Rezaei N. Occupational injuries associated with safety climate among ceramic industry workers in Iran. Scientific Reports. 2025, vol. 15, article 24585. DOI: 10.1038/s41598-025-09704-6.

16. Dağsuyu С., Oturakci М. M., Kokangül A. A new approach to Fine-Kinney method and an implementation study. Alphanumeric Journal. 2015, vol. 3, no. 2, pp. 83—92. DOI: 10.17093/aj.2015.3.2.5000139953.

17. Ageeva E. V., Ageev E. V., Vinogradov E. S. Strategii razvitiya tekhnologiy tekhnicheskogo obsluzhivaniya i remonta avtomobiley [Strategies of development of technologies for maintenance and repair of automobiles], Kursk, 2025, 179 p.

18. Canelón R., Carrasco C., Rivera F. Design of a remote assistance model for truck maintenance in the mining industry. Journal of Quality in Maintenance Engineering. 2024, vol. 30, no. 1, pp. 175—201. DOI: 10.1108/JQME-02-2023-0024.

19. Andreeva L. I. Choice of strategy of repair maintenance of mining equipment. Minerals and Mining Engineering. 2021, no. 4, pp. 83—91. [In Russ]. DOI: 10.21440/0536-1028-2021-4-83-91.

20. Chuksin A. I., Ivanov S. L. Improving the reliability and safety of machinery through precision maintenance (mechanical precision maintenance). Innovatsii na transporte i v mashinostroenii: Sbornik trudov IV mezhdunarodnoy nauchno-prakticheskoy konferentsii [Innovations in transport and mechanical engineering. Collection of papers from the IV International Scientific and Practical Conference], Saint-Petersburg, 2016, pp. 172—175. [In Russ].

21. Maksarov V. V., Kufaev V. G. Magnetic abrasive finishing of workpieces for anti-friction bronze slide bearing shells. International Journal of Engineering, Transactions A: Basics. 2026, vol. 39, no. 1, pp. 26—33. DOI: 10.5829/IJE.2026.39.01A.03.

22. Romanov R. A., Sevastyanov V. V., Pechenevskiy A. P. Modern means and methods of diagnostics of the equipment of mining and mining processing industry according to the concept «Reliable equipment». Vibratsiya mashin: izmerenie, snizhenie, zashchita. 2008, no. 2(13), pp. 24—36. [In Russ].

23. Nazarychev A. N., Dyachenok G. V., Sychev Yu. A. Investigation of the reliability of the traction electric drive of mine dump trucks on the basis of failure analysis of its functional units. Journal of Mining Institute. 2023, vol. 261, pp. 363—373. [In Russ].

24. Mikhailov A. V., Bouguebrine C. Analysis excavator equipping with lidar sensors for functionality improving. International Journal of Engineering. 2025, vol. 39, no. 6, pp. 1414—1421. DOI: 10.5829/ije.2026.39.06c.10.

25. Moskvichev V. V., Kovalev M. A. Evaluation of the operational reliability indicators of the quarry rope excavators. Transport systems and technologies. 2020, vol. 6, no. 4, pp. 25—44. [In Russ]. DOI: 10.17816/transsyst20206425-44.

26. Aliyeva L., Zhukov I. A. Improving the efficiency of percussion-rotary drilling of high-strength rocks by improving the structure of blade-free rock-breaking tools. Sustainable Development of Mountain Territories. 2024, vol. 16, no. 4, pp. 1681—1694. [In Russ]. DOI: 10.21177/1998-4502-2024-16-4-1681-1694.

27. Yaghini A. Electric rope shovel operation enhancements, understanding and modelling the impact of the operator. 2021. DOI: 10.7939/r3-36bh-kf53.

28. Danilkin A. A., Martynov V. Yu., Andreeva L. I., Krasnikova T. I. Approaches to the formation of an effective system of repair maintenance of mining equipment. Mining equipment and electromechanics. 2015, no. 5(114), pp. 39—43. [In Russ].

29.  Velikanov V. S., Musonov O. S., Panfilova O. R., Ilyina E. A., Diorina N. V. Predictive analytics tools in minimizing failures of mining transportation equipment. Vestnik of Nosov Magnitogorsk State Technical University. 2021, vol. 19, no. 4, pp. 5—15. [In Russ]. DOI: 10.18503/1995-2732-2021-19-4-5-15.

30. Zvonarev I. E., Ivanov S. L. Evaluation of losses in transmission of machinery for development of mineral deposits in conditions of variable load. IOP Conference Series Earth and Environmental Science. 2017, vol. 87, no. 2, article 022024. DOI: 10.1088/1755-1315/87/2/022024.

31. Florea V. A., Toderaș M. Efficiency of maintenance activities in aggregate quarries: a case study of wear parts on loaders and excavators. Applied Sciences. 2024, vol. 14, no. 17, article 7649. DOI: 10.3390/app14177649.

32. Panchenko N. M. Choice of rational combination of earthmoving and transportation equipment in the production of earth works. Trends in Science and Education. 2022, no. 87-3, pp. 70—74. [In Russ]. DOI: 10.18411/trnio-07-2022-98.

33. Manakov A. L. Assessment of the state and modelling of the organisation of operation and repair of track equipment within the structure of directorates for the operation and repair of track machines. Vestnik Rostovskogo Gosudarstvennogo Universiteta Putej Soobŝeniâ. 2013, no. 1(49), pp. 109—117. [In Russ].

34. Makarov V. N., Anistratov K. Yu. Achieving the highest record monthly productivity rates for EKG-18 excavators at the open-pit mines of Stroy Service CJSC. Ugol'. 2019, no. 1 (1114). [In Russ]. DOI: 10.18796/0041-5790-2019-1-20-26.

35.Gusev V. N., Odintsov E. E., Zherlygina E. S. Calculation of shifts and deformations of the rock mass considering field data. Gornyi Zhurnal. 2025, no. 4. [In Russ]. DOI: 10.17580/gzh.2025.04.03.

36. Goncharenko S. N., Dementieva E. V. Analysis of the risk of emergencies at industrial facilities of mining enterprises in domestic and foreign studies. Problems of risk analysis. 2010, vol. 7, no. 2, pp. 88—95. [In Russ].

37. Andreeva L. I., Lapaeva O. A. On the issue of analysing the risk of mining equipment operation. Mining Equipment and Electromechanics. 2010, no. 7, pp. 47—51. [In Russ].