The assembly trolley transforms the epanding controller, drive machine and cardan shaft into a "mobile expanding system". It is equipped with a height-adjustable cross beam and a swivel-mounted boom. The drive unit is attached to the assembly trolley with a cardanic suspension. In conjunction with the cardan shaft, which is suspended from the gallows by means of a balancer, the user thus achieves the maximum working radius. The lockable tool cabinet offers sufficient space for tube expanders, measuring tools and the expanding controller.