Excavator Dollies are tools used in heavy equipment. Excavator dollies help the excavator move from one place to another. The presence of Dollies is very helpful and makes moving the excavator easier, one example of which is in mining. In mining, excavators move several times to dig from one pit to another. This tool is very much needed because the undercarriage section of the excavator, especially the track shoe, is not made to move long distances, but only short or close distances. With the presence of these excavator dollies, maintenance costs for the excavator undercarriage, especially the track shoe, can be saved because using this tool can save up to 50% in undercarriage maintenance. Another advantage of using dollies is saving fuel and time efficiency because they can move faster than without them. With the load lifted by the excavator dollies, it is necessary to know the structural strength and safety factor of the excavator dollies. By using the finite element method (FEM), several parameters, such as deformation, stress, and force that occur on the excavator Dollies can be determined.