After some time research I found the solution:
The complete (!) Steering wheel needs to be disassembled. Ie:
Allen screws, remove the cable, unscrew the plate, loosen the screw below the steering wheel, and 'already' done. Thereafter, a black cap must be removed (together with the cable) from the right (or left) engine. Under the cover, there is a small circuit board. There is also a small screw should be found. This tighten (!!) and then zusammmenbauen everything back. Then the steering wheel should be straight again "go".
Coming back to the steering wheel itself. It's all right for themselves, what bothers me is that most games do not support the LED's, too bad. The steering wheel itself is very high and massive. The gear stick is in my opinion a bit too short, but otherwise he is also very good. The pedals are really top, which bothers me that Logitech has provided nothing here for mooring on parquet. I have the problem now with 3 screws, front left and right solved at the "pedal board" (not ansich pierce through the board).
But what really makes me angry again: The table mounts to the steering wheel. They are broken. After just 4 months, they are broken. God knows why. I have to now buy two new brackets plus stopper in a spare parts store of a third party first for 42 (!!!) euros. And then again disassemble the entire steering wheel and installing the brackets.
I was really on the verge of only awarded 3 stars. Da me but not necessarily bring everything out of the socket as fast, there's still just as 4. The star trigger there for the whole problem, "Chen".
EDIT: cost brackets "only" 30 euros. Had the stopper is not needed. Still ne quite a mess.