I was pulling a very heavy trailer through the pasture with my B2710 and there was a smell that I've never noticed. I don't think it was the clutch burning because I've smelled car clutches before and it didn't smell quite like that. The engine RPMs did not increase and stayed appropriate for the speed I was travelling, not what I would expect if the clutch was slipping. Is it possible the hydraulic fluid got so hot it smelled? I touched the HST filter and one of the hydraulic pipes on the transmission and they were too hot to hold my hand on, but they were not hotter than I'd expect.