Abstract: A slewing apparatus, comprising a slewing bearing means for the operation of a reel. A first slewing bearing (10) is configured to carry torsion and axial loads in the reel, while the second slewing bearing (20) is configured not to carry substantial torsion and axial loads in the reel. Thereby the second slewing bearing (20) functions as a back-up bearing for the reel, while the first slewing bearing (10) operates the reel and thus serves as the primary slewing bearing for the reel.

Abstract: A coupling device for connecting a first coupling housing (12) and a second coupling housing (20) is provided. The first coupling housing (12) comprises a guiding element (101; 201; 301a-e; 401b,c; 501b-d) extending from the first coupling housing (12) and having a free end (102; 202; P) at a distance (h) from the first coupling housing central axis (a-a). The second coupling housing (20) comprises a receptacle (123; 223; 323; 423; 523) for the guiding element and pull-in means (8) for pulling the guiding element into the receptacle, said pull-in means (8) being connected to the guiding element free end (102; 202; P). The invention allows the first coupling housing to be pulled towards the receptacle at an angle which is not coincident with the central axis (a-a), and when the guiding element is in place inside the receptacle, the first coupling housing central axis (a-a) and the central axis (b-b) of the second coupling housing are aligned and coincident, and the two housings are rotationally aligned.