First off, those are super useful little tractors with 40hp, 4WD, very universally useful. I HOPE what you got at auction is in good shape...
Geeze -- let's start with finding an Operators Manual. I am serious -- find one and use it. You can get them on-line. Just touching the surface, the 3pt hitch hydraulics on your tractor are classic, typical and ordinary. That means they will LIFT ONLY and gravity or weight of your foot or the implements brings them downward. The two levers you mentioned are Position and Draft Control. You must (read the manual) figure out which one is the Draft lever and put it in the "out of the picture" or not in use position. That is either all the way up as on some tractors or all the way down as on others. Draft control is a little complex to describe and best left till later. Forget it for now. It is there in your manual when/if needed. The MAIN one is the Position Control lever and pushing it forward lowers your implement (lets it lower) while backward (upwards, toward the rear) RAISES the 3pt hitch by hydraulic pressure and thus the implement.
By "scraper" I assume you mean a grader blade that fits the 3 pt hitch. YES, when mounted the weight of it will lower your "lift arms" of the 3pt hitch. As Mr Gooding said above you can/should just lower the two lift arms (by hand) to the point where they easily attach to the pins on each end of your scraper blade. You have to push the Position Control lever forward to allow lowering of the lift arms. So you need to read the manual and figure out which is the position control first and then proceed. Then the top link gets attached of course. That gets you to where you can play with the 3pt lift and attached scraper blade and get comfortable and used to it.
I see that the Owner's Manual is on Amazon for $46.98 or other sources as cheap as $20. Also available in PDF which means you can get it in front of you on the PC in a few minutes in a PDF file, etc.
Good luck and please narrate the details as you learn to use your new machine.