I agree with the above posts. Turf mode is supposed to let one side free wheel so it doesn't damage the turf or the tires.
What I have noticed on my rig is that it works great as long as I'm turning right. But if I'm turning left, the left rear tire tears up the yard and tears up the tire on a hard surface. Is this normal?
You need to make sure that you are actually shifting into Turf mode and not still stuck in 2WD with the indicator not lighting up. It shouldn't do that. That is specifically how I used to test to make sure I was actually in Turf mode.
It isn't technically 1 wheel drive. It is an open differential. Which means that power goes 50/50 to each wheel, it just allows each wheel to spin at different speeds. People think it is "1 wheel drive" because if one tire starts to spin you don't go forward but that is because from the point of view of the diff it is the equivalent of pivoting the vehicle around in a circle on one tire. All the rotation goes to the spinning tire while the tire with traction stops spinning.
If your inside of the turn tire is tearing up the ground, it is spinning faster than it should which usually indicates it is locked into the outside tire (which has to spin faster).
Of course, you could also be turning really fast and the tearing is because you are sliding.