be sure to first: install the drivers properly means attach the wheel when it says you have to attach it and not before
then set it to 900° in the options of logitech profiler (if your already there turn off all forces unless the forcefeedback)
then startup lfs go to the control panel setup all the axles and put it there to 900° also
edit: just as info 900° is overkill in lfs 720 should do it