If it were internal to the transmission there would be some sort of clatter or grinding or ka-BANG!, and it would happen exactly ONCE.
The clutch is slipping all the time, gets hot, and won't hold anymore. Give it a few minutes to cool and it will hold again for a while. Of course it will run longer from cold because it takes time for heat to build up. Just sitting there for 5-10 minutes only lets some of the heat dissipate.
It doesn't do it when you're not mowing because the mower puts a tremendous load on the drivetrain!
There's no way to know for sure what's wrong until you start taking things apart. You don't have X-ray vision. We don't have X-ray vision. Time to get the wrenches out and get busy.
My recommendation is that you drop the belly pump and pull the clutch through the bottom. If the clutch is indeed shot, you can then split the tractor and resurface the flywheel if you think it's necessary. Otherwise, you haven't put a whole lot of effort into tearing the tractor apart unnecessarily.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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