Vibration is one of the most relevant aspects, when dealing with the subject of ergonomics in agricultural tractors, although there are still few studies developed to evaluate this parameter and its implications for occupational health. This work aimed to evaluate the levels of vibration emitted by agricultural tractors with different powers, comparing the results with the norm in force in Brazil, in addition to evaluating these levels in three different types of surface. In its methodology, seven tractors, called A, B, C, D, E, F and G, were evaluated, from the same brand, with powers ranging from 75 hp to 215 hp. The frequency range chosen for the study varied from 5 Hz to 10 Hz, the total data acquisition time was 20 minutes and the tractors operated under similar conditions, with five repetitions in each treatment (tractor x surface). Generally, the tractors studied showed higher vibration levels than the parameters set by the standard used by the International Organization for Standardization (ISO), in a daily working period of eight hours, in the frequency range varying from 5 to 10 Hz.

Keywords: Agricultural machines. Operator. Surfaces. Vibrational analysis.