If you aren't a mechanic or don't have mechanical skills I don't recommend buying on old baler. At least buy one that has been through a shop and been checked out.
I don't see how guys can afford to buy a baler or farm equipment and not have the know how to fix it themselves. I can not imagine having to call on the dealer and wait for them to show up. Nor can I see how they can pay the dealer for the repairs and make any profit. Heck, to me the parts alone are too dang expensive
As Caustic Burno says if you plan on being successful in this business you need mechanical as well as electrical skills. I would hate to figure how much we have tied up in tools and supplies but if something breaks I can fix it. With hay on the ground, rain always magically appears from nowhere especially if you are broke down.
Last Sunday I was baling hay and keep having trouble after trouble- either clogging up the baler from trying to bale some clumps of too green hay (trying to beat the weather) to another field being so dry that the pickup would just roll the hay instead of pick it up, to netwrap troubles. If it wasn't Sunday I would have been cussing. My baler is the only machine that I have that is complicated enough that I carry the owner's manual around with me.
But when its all said and done, and you look across the field at the pretty net wrapped bales, it's all worth it.