I have never needed any shop manuals as yet. When purchasing any tractor, be certain that at least the following three manuals that came with the truck are included in the deal.
1. Volvo operation manual. This covers all aspects of the Volvo cab, accessories, etc.
2. Engine manual. This manual provides operating instructions, service requirements, and all other aspects concerning engine operations and components.
3. Dealer locations manual.
Many trucks arrive at the dealer or back at the leasing company with these manuals no longer in the truck.
If you are lucky, you will also receive a transmission manual, differential manual, hitch operation manual, air dryer manual, radio manual, and build sheet containing all components on the truck.
I have never needed a shop manual. A lot of information is included in the engine manual. Beyond that, if you have a particular job to do, you may be able to find instructions on line.
Any time any part or information of any kind is sought, you must provide the dealer with the vin # of your truck.