Crawler cranes nowadays reach a height of more than 200m and move loads up to around 4000t. They are used for the construction of power plants, refineries and wind farms. In operation a crawler crane is often requested of moving and travelling with a lifted load. Hereby Caterpillar tracks are far better at traversing soft ground without sinking in, as they spread the weight out over a great area and reduce the soil pressure. Thus a crawler crane can move about an unprepared job site with less risk of getting stuck in soft ground. The different ropes which are working together on a crawler crane are heavily strained and need to perform extraordinary.