With the aim of quantifying the shelling" and cleaning systems performance for the Penha CLM-350 harvester, the percentage of loss of corn kernels, which octirred in the straw outlet was determined, as well as, the percentage of debris, in the packaged corn. Taking the corn kernels harvested by the snapping rolls as 100%, the percentage of loss from the shelling and cleaning systems were determined, as well as, the percentage of debris in the packaged corn for the various treatments. The average moisture content for the corn was 15,78% (w.b.). The corresponding treatments for the shelling and cleaning" systems are the tangencial velocity of the shelling cylinder, or the angular velocity of the aspirator considering the geometric configuration of the machine. The analysis of variance with the F tests at 1% e 5% probability level were used to analyse the data, and Tukey's test was used for comparison between means. The statistical analysis showed that the angular velocity of the aspirator, related to the percentage of loss in the straw outlet, was highly significant, making possible the assumption of a linear relationship between the two parameters for the testing conditions. The comparison between means showed that the percentage of debris in the packaged corn were significant for the treatments D (1241,7 rpm) and E(820 rpm), the last one with the higher mean. A more accurate analysis of the data sugests that the percentage of debris, would depend more on the material flow through the harvester, than the rotation of the feeding auger.