Welcome to the forum!
Congrats on finding the '63, I'm sure you have a project ahead of you.
As you may or may not know Hi-Lo went out of business back
in about 2010. But you are in luck, the forum has a library with many Hi-Lo trailer manuals. They are not model specific and they didn't change much from year to year. If you haven't done so yet look in the library at the bottom of your sign-on page and you will see a list subjects including owner manuals. Click on that and you will see a bunch of threads where people have digitized manuals. Go down through the list and look for a manual closest to your 63.
I will help you this time:http://www.hilotrailerforum.com/f49/...gle-axle-2196/
I'm afraid that is the closest to 63 that I could find.