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The objective of this study was to evaluate the influence of different wheel types of a skidder on productivity and cost of Pinus taeda L. wood extraction. The study was conducted in a forestry company located in the municipality of Mandirituba, Parana state, Brazil. The technical and cost analyses included a time and motion study of the wood extraction activity. The productivity, operative efficiency, energy consumption and the production and operational costs were determined for the machines with different wheel types: SDP - skidder with rubber tires; SD2 – skidder with tracks on the two front tires; and SD4 – skidder with tracks on the four tires. Results showed that the activity that demanded most time in the operational cycle was the maneuvering of the machines to pick up more than one tree, resulting in lost of productivity and need of improvement in the operational planning. The skidder equipped only with rubber tires showed higher productivity and lower production cost in the longest extraction distances, caused by the higher operating speed of the machine. Keywords: Timber extraction; wheel types; operating efficiency. Resumo Influencia dos rodados de um skidder na produtividade e no custo da extracao florestal . Este trabalho objetivou avaliar a influencia de diferentes tipos de rodados de um skidder na produtividade e no custo da extracao de madeira de Pinus taeda L. O estudo foi conduzido em uma empresa florestal localizada no municipio de Mandirituba, estado do Parana, Brasil. As analises tecnica e de custo englobaram um estudo de tempos e movimentos da operacao de extracao florestal. Foi determinado a produtividade, eficiencia operacional, rendimento energetico e custos operacionais e de producao das maquinas equipadas com diferentes tipos de rodados: SDP – skidder com rodados de pneus; SD2 – skidder com pneus dianteiros recobertos com semiesteiras e SD4 – skidder com os quatro pneus recobertos com semiesteiras. Os resultados mostraram que a atividade que demandou o maior tempo do ciclo operacional foram as manobras realizadas pelas maquinas para apanhar mais de uma arvore, ocasionando perda de produtividade e necessidade de melhoria no planejamento operacional. O skidder equipado somente com rodados de pneus apresentou maior produtividade e menor custo de producao nas maiores distâncias de extracao, ocasionado pela maior velocidade operacional da maquina. Palavras-chave: Extracao florestal; tipos de rodados; eficiencia operacional.

INFLUENCE OF WHEELED TYPES OF A Skidder ON PRODUCTIVITY AND COST OF THE FOREST HARVESTING