Your post says you HAVE a JD 647, so I presume it's not a question of going out and buying one.I have a John Deere 647 tiller, will the 1880 handle this tiller?
It is for the future, still have the 728...gee downsizing from 27HP to 18 HP rider is a HUGE drop in power !!!
curious as to why you want to do this, unless the X728 is being sold ???