mowing yesterday. got off the mower for a second, got back on and it will not move in either forward or reverse. Left stick is still stiff as if still functioning but the right stick is loose as if broken. Blades still engage and it runs fine, just will not budge. Checked the manual push/pull knobs on the rear frame and they are in the correct position. any hints before I tear into it. Mower i about a 5 year old, Gravely 1740 ztr with the 17hp Kohler. Thanks
