My belt came off and having trouble putting it back on properly. It is a John Deere 190 C with a 54" deck. Is there a drawings I can use to put it back on because I do not have the operator's manual

Hi,
There certainly are; I maintain a site that is mostly just belt drawings. There is a link in my sig. The picture for the 54" is below.
Peace,
Clarke
PS Manual available at:
http://lawnandgarden.manualsonline.com/manuals/mfg/scotts/s2048_s2554_1.html?idRes=1493547