Hello, the G1800 I recently purchased (1991 model) has a 48 inch belly mower that I have noticed (when attached to the mower) is not sitting down on all four wheels, a rear guide wheel is about 1/4 or more up in the air. When off the mower, it sits nice and flat. Nothing looks bent on the mower deck, so i figure its something in the four adjustment points where it connects to the mower; but before I just start willy nilly adjusting the drag links, and pick up bars, is there any procedure or particular non-obvious details i should know? thanks for any help.