Crawler crane

摘要

A crawler crane (1) comprises a main winding drum (3), an auxiliary winding drum (4) and a third drum (5) mounted on a revolving frame (2) to wind an operating rope and the respective drums are arranged in a row so that their rotational shafts are at right angles to a center axis of a boom (6) and mounted on the revolving frame (2). Further, an engine (7) including a power plant for supplying driving pressure oil to the main winding drum (3), the auxiliary winding drum (4) and the third drum (5) is mounted on either left or right side of the revolving frame (2). Moreover, the crawler crane (1) comprises a brake encased in drum provided on each of said drums to brake the main winding drum (3), the auxiliary winding drum (4) and the third drum (5).