8421 Mobile Crane is a TECHNIC set released in 2005 as part of the TECHNIC line. With 1884 pieces, it is the second-largest TECHNIC set pieceswise, with the new 8110 Mercedes-Benz Unimog U 400 having 2049 pieces. It builds into a large, yellow, crane truck with both pneumatics and motorization to work the boom and winch. It includes instructions for the alternate model, which is a cool bucket truck. It's recommended for children aged 11 through to 16.
The Mobile Crane towers above the construction site! This huge, detailed set features six-wheel steering, a telescoping boom that extends to twice its original length, pneumatic cylinders to raise and lower the boom, four retractable outriggers, motor and battery box. Authentic model for skilled builders!
Includes motor and battery box to extend arm and lower hook!
Measures over 18 inches/46 cm long!
Pneumatic cylinder and air pump lift crane arm - release air pressure to lower boom.
Arm extends over 25 inches/64 cm long!
Boom rotates a full 360 degrees!
Includes instructions to rebuild into an Aerial Lift!
Realistic 6-wheel steering! Wheels drive pistons in V6 engine!