Do you by any chance leave the ballast on the rear while mowing? If so. That makes the front end VERY light especially if you take the loader off. (I never tried that combo, but sounds like a bad idea.)
I get the sliding sideways front wheels, when I make a very sharp turn on loose ground with 500lbs of ballast on the 3ph and nothing in the loader.
Just wondering out loud here.
Edit: Just to cover all bases. Check if the rear differential lock is released. If it's stuck that wants to make the tractor go straight. Then the rear wheels would make some mark too in the turns.
I get the sliding sideways front wheels, when I make a very sharp turn on loose ground with 500lbs of ballast on the 3ph and nothing in the loader.
Just wondering out loud here.
Edit: Just to cover all bases. Check if the rear differential lock is released. If it's stuck that wants to make the tractor go straight. Then the rear wheels would make some mark too in the turns.