Could it be that simple?
Not long ago,somebody posted about a clutch not releasing when it got heated up. I believe it was on a 1600. I didn't reply because I was having the same trouble and hadn't found the problem. When I was hauling round bales home early this spring and unloading with my 1600 loader tractor,it was giving me fits. I had to pull it in to under drive to shift between gears and direct then idle it all the way down to get it in gear from neutral. I adjusted the pedal free travel by adjusting the rod. It helped a little bit,but not much and not long.
I've been hauling round bales home this week and using it to unload and stack them in the barn. It was hanging up and grinding gears so bad that I was seriously considering putting the loader on a different tractor until I could pull the engine and change the clutch and pressure plate.
I was putting oil in it this morning and noticed that it looked like the cast cowl had been moving where it bolts to the tub. I got a wrench and those half inch bolts were loose as a goose. I tightened them up and used it all day unloading and stacking. It works great. I think the whole casting was moving when I pushed the pedal down,so adjusting it wasn't doing any good. It was just shifting out of whack then moving back again when I let the pedal up.
The odd things that happen!