Objetivou-se com o trabalho avaliar as perdas na plataforma de corte nos sistemas de trilha e de limpeza e as perdas totais na colheita mecanizada de soja, no município de Maripá, PR, sendo 39 máquinas em 25 propriedades do município. Observou-se que 79% das máquinas perderam mais de 60 kg ha-1. A umidade do ar, a falta de treinamento dos operadores e as deficiências na manutenção e em regulagens, foram os fatores mais importantes na definição das perdas. As máquinas com mais tempo de uso apresentaram tendência de maiores perdas de colheita.

The goal of this work was to evaluate the losses on the cutting platform, the separation and cleaning systems and total losses in mechanical harvesting of soybeans in the municipality of Maripá-PR considering the age of the combines, displacement speed and operator training. 39 machines in 25 farms were evaluated. It was observed that 79% of the machines lost more than 60 kg ha-1. The air humidity, the untrained operators and deficient maintenance and regulations were the most important factors in defining the losses. The machines with longer timer of use presented tendency of more losses in the harvest.