$20 excavator 3D model by jaketnet2012. Available on CGTrader. Check it out on CGHub.
STL (Stereolithography, filesize: 35.6 MB), STP (STEP, filesize: 35.6 MB), JPG (JPG, filesize: 35.6 MB), MAX (Autodesk 3ds Max, filesize: 35.6 MB), PNG (PNG, filesize: 35.6 MB), IGE (IGES, filesize: 35.6 MB), CATPRODUCT (CATIA, filesize: 35.6 MB)