Crawler crane with telescopic boom, based on the components of the Liebherr LTM 1800 (boom and upper structure) and LR 1550 (crawler undercarriage). I built this model many years ago. It is still based on the old 9V components with geared and non-geared motors, as well as micromotors. Motorized functions include: - Independent drive of left and right crawlers - Four support rams - Two support rams on long cantilevered support beams for the erection of long boom systems. - Slewing of the upp...