The best place to get your Oliver manuals is The Floyd County Museum in Charles City IA. They have a web site but it is best to call for manuals. There are owner manuals, parts manuals and shop manuals. You probably purchased a section of the shop manual, there are people trying to maximize their income by selling the shop manual in sections instead of complete. The price of a complete manual is about $400. It not only includes the 550 but all Fleetline tractors Super tractor and 3 digit tractors.

I hope this helps.
John Schoenauer