I could not explain the difference, but the oil bath clutch, direct drive was a very well proven and reliable drivetrain for extended drawbar work.
I'm not sure what it is with the power shift, when applied to long/extended drawbar work, may very well have a lot to do with heat. And as many times I've been present and assisted with tear downs and significant repairs on these era tractors when we were not busy, I never really learned the design of those, just helped the guy who did LOL !
I've operated both, as well as dry clutch, their powershift was very reliable, if you read the crawler forum over the years, you'll see similar an typical issues that do come up, that people have posted about, but they sure performed well in earthwork.
That would be an interesting post on that forum, whats the difference between the direct drive and powershift, (pre-high track era) and why was the direct drive best suited for drawbar work.
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