Hard to tell from the pics but it appears you may have the wrong lift bracket.
Since you have an older deck you should have brackets pictured below.
The "newer" style decks 1966 and up used this style bracket which as you can see dosent have as sharp of a bend in the metal.
Well, you could be right on that. I didn't know they had different brackets on the tractors for different year decks. My 850 is a 1969 - the last year for the 850. It could have an older deck on it. I'd actually like to find a newer deck for it with a front roller and wheels so that it doesn't scalp the lawn as badly as this deck does. Depending on the slope of the terrain, the deck I have with the metal runners on it doesn't really do a good job of allowing the deck to "float" and especially not having a front deck roller allows the middle blade to scalp the lawn on the crest of hills and slopes. If someone has a lead on a newer deck in good condition, let me know!!
Edited by MailmAn, October 30, 2012 - 02:50 PM.