Mobile crane and method for angling a main jib extension relative to a main jib of a mobile crane

A method for angling a main jib extension relative to a main jib of a mobile crane, wherein the main jib is mounted in a luffable manner on the mobile crane and can be raised by a luffing cylinder with the main jib extension being releasably connected to a main jib head of the main jib by upper and lower bolts, wherein an angling drive engages a foot of the main jib extension and a maximum angling angle is limited by an adjustable angling plate and the angling plate engages the foot of the main jib extension and the main jib head, said method comprising:

• raising the main jib extension from a basic position relative to the main jib about a luffing axis as far as until the upper or lower bolts are relieved using the angling drive, wherein the mobile crane further comprises a combi-angling plate comprising the angling drive, and wherein the angling drive engages the main jib head on the one hand and engages the main jib extension on the other hand, and wherein the combi-angling plate comprises a sliding plate, a guiding plate and the angling drive, the angling drive drivingly engages the sliding plate on the one hand and the guiding plate on the other hand, and wherein the sliding plate can be displaced relative to the guiding plate by the angling drive, and wherein the angling drive is releasably fastened to the sliding plate, wherein the sliding plate is pivotably mounted on the main jib head, wherein the guiding plate is pivotably mounted on the main jib extension, wherein the sliding plate is guided in the guiding plate and a maximum displacement of the sliding plate in the guiding plate can be limited by a stop bolt;
• removing the upper or lower bolts;
• inserting at least one combi-angling plate between the main jib head and a top chord or bottom chord of the main jib extension, wherein said inserting may be previously performed;
• lowering the main jib extension using the angling drive for as long as until the maximum angular position is reached or a head of the main jib extension comes to rest on a ground;
• drivingly separating the angling drive from the combi-angling plate;
• and
• raising the main jib if the maximum angular position is not yet reached in order to angle the main jib extension until the desired angling angle is achieved.