Slips when pulling a load

[birddogger]

I've never heard a slipping clutch, they just slip.
Test the clutch before you split it; can it pull away from a stop in high gears with the usual engine loads a bit then speeds up and rolls out? It it pulls out straight away I wouldn't bet on it being the clutch.
This doesn't mean that you don't have to split it, but I wouldn't order clutch parts until it fails the high gear test.,

 

[jamesparkhyde]

At the pedal there is one inch of free play before there is any resistance by the clutch. Yes, it easily moves out from a stop in the high gears, just as you described.

 

[birddogger]

Sometimes you just need to hear/feel what's going on to venture a good guess.
Is the whining anything like when you don't have the clutch down and try to put it into gear with the motor revving?

 

[jamesparkhyde]

Thanks for the comments. I'm going to have to do some experimenting. It's a little time-consuming since I need to put the plow on and go plow something. Maybe I can recreate the problem by just chaining the tractor to a tree...