Got a belly mower on my Kubota 2601. I have 160 hours or so on the tractor, maybe 60 or 70 (tops) of them mowing with the belly mower. (The tractor gets used for other things, too.)
The mower cuts grass poorly, leaves streaks, cuts unevenly, leaves stubble of various lengths, just does an ugly job. I don't expect it to manicure the grass, but I think it should be doing a better job than it is. I have a (crappy) garden tractor that does a much cleaner job (when it runs, but that's another story).
The area is pretty flat, no rocks or gravel, the grass is cut fairly frequently, so I'm not asking it to cut down the Amazon rain forest. I've set the anti-scalp rollers according to the manual, and the cut height is usually set between 2 3/4" and 3.5".
I do know the back of the mower deck should be slightly higher than the front, and I know how to adjust it. I can park the tractor on a level concrete floor to make any adjustments. Mowing speed doesn't seem to make any difference, if I am in high range, I just get a crummy job faster than if I am in low range. Throttle is usually set about 2100 rpm, redline is 2600, the grass looks the same but the tractor just makes more noise and burns more fuel.
I'm open to suggestions . . .
Best Regards,
Mike/Florida
(The larger the island of knowledge, the longer the shoreline of ignorance.)