You might want to look at this thread with special attention to a post by Caretaker, who has not only owned a QH-15 for a couple of years but also gives a great explaination of three point hitches, quick hitches in general and specifics on quite a few, including, of course, the QH-15.
I think that will probably answer all of your questions. I hope this helps. /forums/images/graemlins/smile.gif