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The use of the technology in the field comes to soften the intempéries to which the rural worker is submitted. A spread of microtractors in family farming helps to reduce the physical burden on farmers and working time. However the contact with this technology exposes the farmer to new problems coming from the machine being its vibration. Reducing vibration, in addition to reducing operator stress, can improve the quality of life and increase work efficiency by reducing fatigue. The aim of this study was to evaluate the vibration levels of a bulldozer coupled with rotoencanteirator at different engine speeds and to allocate gears without soil preparation. The experimental design was used in completely randomized blocks, in a 3 x 3 factorial scheme, with 10 repetitions being 3 rotations (600, 800 and 1000 rpm) and 3 marches (3rd, 4th and 5th). It was quite descriptive statistic and Tukey Test at 5% for average comparisons. It was observed that as average of the third gear at the 600 and 800 rpm rotations were as close to the NHO 10 (2013), since the same thing is the value of 2.5 m.s as vibration limits for the hands and arms tolerable for a day's work.

VIBRAÇÃO EM MÃOS E BRAÇOS NA UTILIZAÇÃO DE TRATOR DE RABIÇA EQUIPADO COM ROTOENCANTEIRADOR