I have a John Deere 797 z-trak, 72inch deck. I need to change the fan belt. Any tricks to doing this? Can't find a way to tension the belt. I'm changing the hydraulic pump belt also and that looks pretty straight forward with tensioner. Fan belt doesn't look so easy. Any help appreciated. 2005 797, 7 iron 72inch deck, 29hp kawasaki engine. Thanks.