Good day Stevie
I have parts of information but not a complete manual, if you can be specific I will try to help out. I guess the operator's manual is a good starting point that I do not have, I know there is little difference between the 140-50 and the 450-60. If you can find any of those, you have a good grounding to the operation. Making a good inspection, getting answers to any questions you have will increase the actual machine knowledge and be very beneficial to a new owner. This forum has guys with great Volvo knowledge one regular contributor "FunWithFuel" may be worth tagging his posts.
Kind regards
Uffex