Abstract
Attaching drum cutter working equipment to replace bucket on backhoe hydraulic excavator has been widely used in construction including dredging task. The study of the working range of these types of devices on the excavator is an important content in the class of problems related to the installation of replacement equipment on the excavator to complete the machine according to either the designing criteria or the technical requirements and workspace during construction. The paper studies on changing the working area of the dredging drum cutter attached on an excavator with two-piece boom.