The objective of this work was to estimate the longitudinal and transversal stability for dynamic traffic conditions, based on the coordinates of the gravity center (CG) of two tractors, a Feller-buncher and a Skidder, equipped with driving wheels of tires, used in a long logs utilization system in a eucalyptus stand. The tractor Skidder presented a value of inclination of transversal ramp of up to 33,2%. As for the "Feller-buncher", its use should always be recommended on plain lands, because of its technical and operational characteristics, with great load concentration in the front axis when moving loaded.
Stability; center of gravity; forest tractors
