Steering Help - 860

This tractor has been used and abused and I'm fairly sure it is a mutt, put together from several junkers. However I have had a lot of use from it so am not complaining.
Yesterday, mowing, all of a sudden I cannot turn to the right. Turns left and almost back to central but that's it.

I'm sure the steering box will have to come apart but what is the most likely part(s) I'm looking at to give this problem?

Thanks

Jack

Follow Ups:

• Re: Steering Help - 860 - soundguy 18:42:09 07/25/13 (3)
  • Re: Steering Help - 860 - Jack - Iowa 18:51:48 07/25/13 (2)
    • Re: Steering Help - 860 - soundguy 18:54:50 07/25/13 (1)
      • Interesting! - 860 - Jack - Iowa 17:30:47 07/27/13 (0)
• Re: Steering Help - 860 - Texas! 16:57:28 07/25/13 (3)
  • Re: Steering Help - 860 - Jack - Iowa 17:23:26 07/25/13 (2)
    • Re: Steering Help - 860 - Texas! 18:34:43 07/25/13 (1)
      • Re: Steering Help - 860 - Jack - Iowa 18:53:58 07/25/13 (0)

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