I was mowing along a ditch bank today and it was very wet. It was so wet that when I got to one point, suddenly the bank squashed out and the Z fishtailed into the ditch where it sank more. It would have pulled itself out, but I didn't want to make any more mess or cause any more damage than was already done. So I just towed it into the street. I remembered reading in my owners manual to release the bypass valves 1/4 turn to relieve the drive system for towing or moving the machine with the engine off. So I did. When doing that it seemed the valves were already turned pretty far out. So now I'm thinking Humm....??? Could someone please educate me a bit about these valves, their mechanical function, how hey should be adjusted, ect...ect...?