The UML/HY/VT forestry mulcher with fixed teeth rotor for excavators and special carriers from 10 to 15 tons on wheel based excavators can be used in any condition. The driver is protected from mulching debris by the safety door on the front of the mulcher. The positioning of the automatic variable displacement hydraulic motor inside the frame protects it from any rubbing with branches. This variable displacement increases the mulcher's productivity by 35 % while reducing its fuel consumption.