Abstract: A method and a device for attaching and removing an additional device having individual elements to and from a main boom of a mobile crane using no auxiliary crane is provided. In the method, a partial piece of the additional device having partial pieces is raised into an inclined position while being rotated about an upper pivot point, and a head of the main boom is bolted to a lower end of the inclined end of the partial piece of the additional device facing the mobile crane so as to be able to rotate. Using a hoist cable, all partial pieces are raised in alignment with respect to each other and the main boom, and are bolted to each other in this position and to the main boom. A displacement device for carrying out the method is also provided.

Abstract: An auxiliary device for equipping the main boom of a mobile crane with an auxiliary boom, wherein a support is mounted near the head of the main boom, by means of which the lifting cable of the main boom may be run to a connection point on the auxiliary boom. The invention further relates to a method for equipping with an auxiliary boom.

Abstract: The invention relates to a method and to a device for attaching and removing an additional device comprising individual elements to and from the main jib of a mobile crane using no auxiliary crane. In the method according to the invention, a partial piece (2.1) of the additional device (2) composed of partial pieces is raised into an inclined position while being rotated about an upper pivot point (C), and the head (1.2) of the main jib (1.1) is bolted to the lower end of the inclined end of the partial piece (2.1) of the additional device (2) facing the mobile crane so as to be able to rotate. Using a hoist cable (7), all partial pieces (2.1 to 2.7) are raised in alignment with respect to each other and the main jib (1.1), and are bolted to each other in this position and to the main jib. The invention furthermore relates to a displacement device for carrying out the method according to the invention.

Abstract: A device for installing the lower and upper jib support of an adjustable auxiliary boom. The device includes a setup frame which is connected to the lower jib support a tie rod section one end of which can be connected to the hoist cable of the main hoisting gear whereas the other end is hinged to the top of the lower jib support and a tensile member section between the lower jib support and the upper jib support.