Abstract This study aimed to perform a comparative analysis between models of mechanical maintenance in forestry machines, subsidizing operational planning in order to reduce production costs. The work was conducted in a forestry company with feller bunchers, skidders and harvester machines. The comparative analysis included the Traditional Maintenance and the World Class Maintenance (WCM) models in the judgment of mechanical availability, hydraulic oil consumption and maintenance costs. Using the WCM maintenance model, the results showed a 5% increase in mechanical availability and a 60% reduction in hydraulic oil consumption. The maintenance cost increased by 3% in the WCM model due to an investment in infrastructure and the training of mechanics, but with the potential for better maintenance of forest machines, along with improvements in operational safety, production capacity and longer machine life.

Abstract Economic analysis assists the administration of forest projects (mainly long-term ones) in providing solidity to the investment. This study aimed to analyze the economic viability of an eucalyptus plantation used for pulp production in the mesoregion of Southern Pará, Brazil. Financial analysis was performed using the following methods: net present value (NPV), equivalent annual value (EAV), soil expectation value (SEV), internal rate of return (IRR), and benefit-cost ratio (BCR). Additionally, sensitivity analysis was conducted to identify the cost and revenue values that would represent the interface regarding the viability of the project. To this end, a cash flow was created for different scenarios of cost and revenue. The economic indicators demonstrated that the investment, as proposed in the marketing of standing timber, proved to be economically viable. Sensitivity based on the updated net revenue, despite fluctuations, made the project profitable.