Wildman
Established Member
from the diagram on the manual you posted a link to it looks as though the wheel should come off by removing three bolts marked 2.79 on page 18, top of the page. You can see the adjuster, It is possible it has been wound up so far it no longer connected to the adjuster rod. Thus would make the blade appear too short. Turn the handle anticlockwise (assuming a standard thread) to bring it back down (you could try this before removing the wheel), I suppose it is possible the thread is damaged and will no longer engage but with the wheel off you will be able to see what is going on. Mark the position of the wheel in relation to the shaft so it goes back the same way round and in balance. All is easy to see in the diagram on page 18.