BlackLion44,
You do realize that your ZTR is an Ariens Zoom, not a Gravely Zoom don't you? Areins owns Gravely, but they are two distinctly different lines of lawn products. I'm not certain that Gravely manual link from user lawn mower fanatic will work for you but it might. If it doesn't try starting at the Ariens Home webpage and go from there(link below):
Riding Mowers