How do I replace hay baler belt fasteners?

https://instantmanual.net/new-holland-br7060-br7070-round-baler-service-repair-manual.html

You may need to get a manual

Have you baled with this baler before you put new belts on it? If not be sure all the belts are the right length, 444" , The belts should not be tight enough to turn without hay in the start up roll. When you start rolling a bale zig zag on the windrow, take care of the sides the middle will take care of itself. There was an update years ago of two 3/8 bolts and spacer for to belt tightner chains to keep the belts loose until there was enough hay across where the bale begins to tighten the belts and start rolling. You don't want the belts rolling with no hay in it. Will not roll straight.

will need owners manual the following links should assist hesston 530 round baler owners manual hesston 530 round baler parts manual

here is some conversation that might help
http://www.tractorbynet.com/forums/haying/285294-new-holland-565-square-baler.html

I don't know about buying one, but you can download one for free at http://www.alliedsystems.com/pdf/Freeman/Operators/PB00000102.pdf

Seems to be a Hay Baler, so I moved you from the Motorcycles category. Closest category I could find is a hay baler toy. You manual is here

Claas ROLLANT 250 Manuals ' ManualsLib

https://www.manualslib.com > products > Claas-Rollant-...

Claas ROLLANT 250 Pdf User Manuals. View online or download Claas ROLLANT 250 Operating Instructions Manual.

Claas Round Baler Rollant 250 & Rollant 250 Roto Cut ...

https://www.agrimanuals.com > claas-round-baler-rolla...

THIS OPERATORS MANUAL GIVES ADVICE ON THE OPERATION THE LUBRICATION MAINTENANCE AND SAFETY ASPECTS INCLUDES ILLUSTRATIONS ...

The mobilco sounds like a gar lubricant. I bale myself and work on my own machinery. The first thing you need is the make, model and serial numbers. There shuold be a tag somewhere fastened to the machine. Both of mine have the tag riveted to the flywheel side of the frame.Mine are old john deere balers. Balers can be very complicated machines and you need the manual to dial them in right unless you know that machine like the back of your hand. Sometimes you can have tying problems from bad twine that might have been damp or knotters rusty and not moving right. Some times penetrating oil on the moving parts of a knotter will do wonders. I am assuming that you are talking about an old square baler since I dont know what you have for sure. I started having problems with mine when the twine started wearing a pretty deep groove in one of the parts it dragged across (dont remember which part it was) but anyway, I replaced and reshimmed accordingly, and it ties really good now. Hope I could be of some help.

Your timing belt has slipped. If you have the repair manual for your baler, this is a relatively easy repair.