While I don't know their names off hand , there are a few 5 ton owners in your neck of the woods that frequent here, I imagine one of them would be happy to come by and show you some important items about your new 5 ton.
Meanwhile find an operators manual for your truck ( or M809 series of trucks) the operators manuals end in -10
There may be one on this site. Sorry I'm not much help, I know a bit about 2 1/2 tons, 1 1/4 tons & 1/4 tons, but never had a 5 ton.
Safety First - Enjoy the new toy second.