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Darren: What Allan means by diamond shape cab, they were about 16" wider at the top of fender level, than your current fenders, then tapered in at top and bottom giving a diamond appearence. They were not an IH cab, however were installed as factory equipment on 56 series tractors, also on some 66 series. The older cabs use on 06 tractors were straight wall, top to bottom, about same width as fenders on your tractor. There were also other aftermarket cabs used on 56 series tractors I actually bought one of the diamond cabs from IH dealer, in 1975. It came from 1 of about a dozen 1066 tractors sold to a road dept. Road dept had specified ROPS cabs and these 1066 came with diamond shape or Excell was the name of it. I think the same design was licenced to several manufacturers, as I've seen the same Cab under different names, and on different makes of tractors. Anyhow I installed that cab coming from a 1066, on my 656. I had to fabricate completely different cab mounts all 4 corners. As Allan said, the chassis is a different size between 656, and the larger tractors, and that chassis size is your biggest challange regardless of which cab you use. I had to fabricate all the floor parts. We ran out of time, tractor had to go to work, and I never did close it in around the 3 point hitch. That one around the hitch would have taken a bit of time, completely different as hitch rockshaft has to come up inside cab on 656. Either that or set cab forward and if you do that, the operators back and head will be against back window. 656 battery on the side also became a problem installing cab, you have to consider how it's going to be removed without removing the cab. In my case I wanted larger batteries than factory, thus I built battery boxes along engine frame rails ahead of cab, but I didn't have a loader on there. It can be done, but is a lot of work.
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