As usual, I agree with most of what you said. Dealer support is paramount on major machines, but flex headers were not around when the F and F2 combines were built....they had floating cutterbars, so of course you could not find a flex head like a 315. Yes, the 313/315 might be adaptable with proper module ($800 and up, plus harness from a later series 3 machine).
Re changing pulleys and belts- that"s a summer/fall crop thing on the smaller machines. One for small grains, then the other for corn/soy. I can do that change in 15-20 minutes. M and larger- no changing them.
I agree about the step in capacity....4400/4420, smaller than F2. And the cooling issues (ok, OVERHEATING with the 4400 before they copied the Gleaner rad cooler. 6600/6620 certainly larger in throughput. 66 vs 44- way bigger shafts and bearings on the 66xx...more durable, reliable.
I"ve always been impressed about the versatility/compatibility of JD headers vs Gleaner......fit various models, drop them in the field, easy hookup with no supporting legs, hooking up drives, etc. Yeah, I"ll give JD those issues. But no need to slack off on ease of maintenance, quality of grain sample, ease of adjusting, ROCK PROTECTION, etc, re the Gleaners.
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