1st, your backhoe isn't a quick attach so taking it on and off is a bit of a chore. 2nd, it doesn't have a 3 pt. so finding all the parts and adapting them will be a lot of work as well. 3rd, finding all the parts and making sure they are the right ones will take some work looking through different parts books. 4th, cost, it will likely cost 2 or more thousand dollars for the parts. 5th, you could likely buy an older Ag tractor in the 5 or $6000 range that will also have a PTO if you ever wanted to run a mower or tiller. A tractor already equipped with a 3 pt. hitch will likely be much more user friendly 6th, you can keep the hoe on your 580K so it's always available if you need to dig out rocks or stumps encountered while using the box blade. It would be a lot of work adding a 3pt. to your 580K with no guarantees of how well it will work.