Is this what you wanted to show?For the partbooks-Agcopartsbooks.com by guest user press "view Books", then put 12 in for model number and change the drop down box from all brands to Massey Ferguson. There will be a list of the model 12's for Massey, press 12 Tractor. The parts book will open up, on the left under title press the "drive idler conversion kit" it will bring up the belt, pulleys, and brake parts. I can't get the picture from the parts book to copy and past here.
The MF12 I have is variable speed not a hydro, so I don't have a tensioner to look at or take a picture for you.
I do not think anyone replied to the thread. The first picture from the post 3/13/17 the belt is routed correctly. The issue was the spring tensioner is bent (pic 2) the spring tensioner outside case has 2 ears that fit in the bracket with the notches. The brackets were not made strong enough IMO, I had to fix the one on my 12H.Did anyone ever reply to this thread? Having a similar problem with a MF 12 I just purchased. Diagrams help but pictures are better. I'm not sure if mines missing parts or how things are supposed to be put back together.