The article examines the dynamics of a multi-mass ramming machine. These mechanisms are used for compaction of soils, road surfaces, etc. It is known that the impact pulse depends on the amount of motion transmitted by the impactor into the ground. Therefore, it is possible to ensure the transmission of the same amount of motion by a smaller mass by increasing the speed of its application, while reducing the metal consumption of the working body. These goals are achieved using the mechanism under study. The rammer is mounted on racks on which a crank drive is mounted with phase-shifted cranks connected to the main and additional connecting rods, at the free ends of which impact sliders are fixed, and an additional reactive mass made with strikers and spring-loaded relative to the racks towards the plate. The reactive mass is equipped with an anvil fixed to it by means of an adjustment bolt, and the crank-rod drive is made with equal-sized cranks offset in phase by 180 \(^\circ \) and slider-impactors located in the hull and directed in opposite directions. Mathematical models of such mechanisms are a piecewise-smooth (hybrid) dynamical system . The dynamic analysis of the model was carried out numerically and analytically using the method of point maps of a two-dimensional nonsmooth Poincaré map into itself, which made it possible to describe possible adjustments of motion modes depending on the parameters of the studied mechanisms.