Industrial machinery fleets play a critical role in enhancing productivity and efficiency across various sectors in Senegal's economy. A quasi-experimental design was employed to assess yield improvements, with data collected from a representative sample of industrial operations. The analysis revealed that an increase of approximately 15% in operational efficiency per annum when using the recommended machinery fleet configuration. This study underscores the potential for significant yield enhancements through strategic management and optimal equipment selection within Senegal’s engineering sector. Adoption of best practices in machinery fleet management is recommended to further boost productivity and competitiveness. Industrial Machinery Fleets, Quasi-Experimental Design, Yield Improvement, Engineering Sector The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.