8053 Mobile Crane is a TECHNIC set released in 2010. It contains 1289 pieces. It builds into a large mobile crane and can be rebuilt into a harbour crane using instructions from the LEGO website. It can be motorized with the Power Functions set 8293 Power Functions Motor Set.
LEGO.com Description[]
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Lift heavy loads to the sky!
The ultra realistic LEGO® TECHNIC® Mobile Crane towers over construction sites! 4 extending outriggers stabilize this mechanical giant as the telescopic arm extends up to 23.5” (60cm). Rebuild into a Harbor Crane.