You will need to check to see if any other services run on 440VAC. Eg. coolant pump, Auxiliary motors, contactors, etc. All the motors will need to change voltage, and if the contactors are running 440, they will need to be replaced. Control components are rarely high voltage though, and are often supplied by a small control transformer. If this is the case, you will need to re-wire the transformer to 220 as well.
It may be easier to find a three phase boost transformer. These are usually fairly easy to find in the scrap yard, if they haven't been raped for their copper. However, if you are able to find one, no re-wiring in necessary on the machine side.
Post some pics of the electrical boxes and motor nameplates, and we can give you some more guidance.
-Cody