Not the best diagram but this is what my manual has with the parts listing .
No one will be able to make heads or tails out of the part numbers , Just dig in to the machine & be careful not to damage seals & part numbers on the bearing when you remove it if ya have to smoke it off .
Throw it all in a box & take it to the local tractor supply house . Tell the parts guy to take a deep breath as he will just have to match up what what's in front of him .
Sometimes that means walking in the back room & opening up boxes of parts to visually match it up .
I deal with these cat's , they are pretty good at it !
http://www.boydandsons.com/machinery/
It's pretty funny when the parts & sales guy's see td25c walk up and they try to lock the front door as they know a challenge is on the way . LOL !