ACE manufactures the Crawler Crane with 40 to 180 tons. ACE Crawler Cranes are used on soft ground for erection and maintenance work. Crawler cranes are similar to Hydraulic Excavators in traction and swing the load through 360 degrees. The machine stability is achieved by the tracks and there is no need of outrigger stabilisation. https://www.ace-cranes.com/equipment/crawler-cranes