I am not sure what really happened as I didn't stop and really check it out...just kept cutting....
I was mowing with the rear grooming mower on my front slope. I had been up and down the hill several times with no problems (note: steep enough that I had to use 4wd near the top of the slope and then used 4wd to slowly crawl down the hill). On one trip, just as I started back down the hill, I was freewheeling so fast all I could do was try to keep from flipping as I tried to apply the brakes, without locking a tire and make it more likely to tip. I put two different sets of skid marks, digging up grass, before I got leveled out and slowed down. I should have stopped, checked everything, and assessed what happened. I didn't. As I was on level then, I pulled it out of 4wd (with my foot, as I usually do), it had definitely been in 4w. I can't really say if I pushed the shift forward to be sure it was in low. I don't think it had slipped out, or that I had knocked it out. But, I really don't know.
One thing I do know is I check it well now and keep my mind on where to steer if it should happen again.
A little freewheeling down a steep slope certainly does add excitement to mowing the lawn! /forums/images/graemlins/shocked.gif
Tom