Contributions to the study of the dynamics of agricultural tractors equipped with front-end loader and rear forklift loader.

In the paper is analysed the longitudinal stability of tractor-front end loader system and of tractor- the forklift system in the most difficult work situations: descending on a slope, braking in translatory motion and acceleration of the fork while lifting the load. Based on the equivalent dynamical models of the real tractor- loader systems are elaborated the mathematical models describing the dynamical behaviour of the systems under working and transportation conditions, which deliver the criteria for the dynamic stability. Further, computer simulation allows the study of the longitudinal stability of the systems trough application for the constructive tractor-loader models.