Any thoughts on a 740TT

Is that the one in Kinistino?

Yes, don't think cemos is much use to me. I can get by making setting changes myself, and if I throw a little extra out the back then I won't loose any sleep over it.

Is there a place to finds specs or brochures? All I have found so far is a German brochure and some very crude listing of specs. Looks to me that the 740 and 750 use a little shorter cylinder than 760 but can't make much else out of the German brochure. Guessing the rotors are the same and so they just narrow the body. Maybe rotors are smaller diameter also, can't tell from German wording.

Looking at nameplates i see the first few years are model c48 then around 2014 they are c68. So some kind of changes made to add technology i guess to create a new build.

Found the brochures, I don't use google as default browser but once I switched to Google I found a few.

I see that dynamic cooling is quite a change in concept, that's probably when the C13 went in also.

Rotors are same diameter and length on all models.

Watched a couple videos of a TT turning and didn't see any real problem with ridging or scraping. I don't turn too short to begin with so don't think tracks would take too much getting used to. Duals wouldn't be too bad either, just not 900 singles. Tracks would be preferred though now that I see all the compaction problems we have on our land and am starting to deal with them.

Will need to think on this and see what makes sense from a financial planning aspect. Thinking I might be better off looking at a 2014 or newer and keep it for many years. Pay more now but have the better machine. Looks like trade in on a +15 year old machine is not likely with all the new iron sold the last 12 years showing up at dealers.

If the machine hasn’t had a big work order on it by the 13-1500 hour mark expect to pay for some reconditioning of it. That seems to be where the machines need wear parts put in.

Ya, might also be looking at drive pulleys, major belts, feeder chain, elevator chains/sprockets. Should be able to get 100 to 200 hr warranty if buying from a dealership. But I'd be looking close at an inspection sheet and any work orders done in last couple years.
One thing you'll notice coming from a 88 is how much heavier the metal is on the Claas.

The "for not much more" comment is on my mind also. Lots more 760s out there than narrow body. 30 and 40 years ago Claas was a better choice because they had notably longer walkers than north American built units, New Holland was similar. European designs tended to deal with more straw and seperation of small grains vs north American requirements. Along came rotor threshing and then came conventional threshing with rotor seperation (like the Claas 116CS of the mid 80s) and now the Lexion with a different take on the CS models. Each has its points.

I think a rotor design of some kind is a good fit for me based on my weather and types of crops/yields. Whether it is a hybrid Claas or perhaps a New Holland CR. I suspect the Claas 670 is a better fit the further north a guy goes based on the fundamentals of its design.

Fuel economy is something I can't track, may have dumped on the go about four times this year vs driving 1/3 mile to unload at truck about 10 times and many times driving shorter distances. Can't be fuel efficient driving across a field to unload at parked truck.

I still have lots to think on. The 2388 treated me well again, about 180 threshing hours for 1600 acres because of lots of farting around due to sloughs, wild mustard patches, grasshopper damage, no full time truck driver, etc so in a normal year can be more efficient. Just a fan belt and tensioner and changed a few chains. Basically 3 hours of downtime, no downtime for header repairs. If my Case dealer didn't screw me around I probably would be buying another one but since they made it pretty clear where a single operator sits in their business plan then would be kind of dumb for me to do that again.

So still thinking Claas, probably a rotor vs walker simply because the basic principles seem to fit my farm. No Gleaners around so don't think I will go down that road. New Holland is an option, would be into a class 8 or 9 because class 7 pretty much don't exist, same with case. And so I come back to "for not much more", I can look at a class 8 or 9.

Really tempting to buy another 2388, keep looking at ads though I shouldn't, now seems the time to bite the bullet and go a different route.

That's a good point about keeping straw intact with the 670 to improve sieve performance. This year I had all 3 limitations with the 2388 which is new for me, power limit in wheat, chaffer/sieve overloading in swathed mustard and rotor loss in flax. Usually it is a combination of factors that come into play but this year was distinctly one or another. In theory the walker machine may have less limitations in the mustard and flax given same conditions and power wouldn't be an issue either.

So will think more on the walker machine.

One thing about the rotor units is it is impossible to damage grain. I mean if operating it remotely in the area of decent performance then rotor speed and concave position is a non issue for grain damage. Looking at a handful grain in the hopper for threshing damage is something that is not needed. How are the Claas units for sensitivity to adjustment for grain damage? The assumption being it is set good to begin with. If you make adjustments during the day do you ever come close to damaging grain? The question comes because the APS is something different and so if it is working well I would think grain damage is less of an issue compared to past conventional combines. Cracked wheat wasn't too hard to avoid in days gone by, peeled barley was a bit more sensitive to changes through the day if I remember right.