Hi Nooni. I have a Tractor 11 that I have rebuilt over the last 18 months plus.
With the steering issue, mine hits the chassis rails on full lock. I am guessing that the previous owner either replaced the hubs with wider ones or fitted wider front tires or both. The turning circle is very average but the steering setup on these is, in my eyes, far more robust that that of say the early Evolution series. They don't seem to put up with the years of use the Tractors do.
I can take some pics of mine if you like.
I replaced the tie rod end with a later version unit which has a better dust boot. I also replaced the "crown" gear shaft bush and the whole "crown" gear shaft with a new item from Greenfield. Most of it was purely neglect from the previous owner who I know skimped on maintenance.
I turned the steering column pinion 180 degrees and the steering is now excellent with very minimal play.
I am going to use an old tire tube and zip tie it to both shafts as best as possible to try and reduce the amount of grit that enters the two meshing aluminium gears.
I just spent 12 hours on mine slaying 6 foot lantana, ferns and all sorts of weeds. I really should have photgraphed the property I cleared. Amazing from just an 11.5HP Briggs.