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He's suggesting you take 4 or 5 bales of hay or straw with you and have the machine ran while you feed it the material. That would be the best way to see how well it works. You would know right then if it makes good knots and square bales (not bannana's). 4 or 5 bales run through machine should produce atleast 3 out the chute. Otherwise, like already said, check out the bale chamber for rust, some surface stuff is ok, but your don't really want a bunch of pitted and spalling metal (not that it can't be cleaned up, but it definitely shows lack of care). The plunger should slide smooth, there should also be only about 1/32" gap between the plunger knife and the fixed knife (to big a gap will aid in making mis-shaped bales). The plunger knife should be sharp.. (not like a knife blade though). Trip the knotters while rotating the flywheel so you can watch the needles move into the chamber. Nothing should hit, and if the needles are adjusted right they should just brush against the knotter frames. This is also a good time to check the plunger "stop" (on left side below knotters)it should move in and guard the needles, make sure this spring is good. Check for broken "haydog" springs there are three (two on top, one on bottom). The "haydogs" are hockey stick shapped metal bars that stick into the bale chamber at the knotters. There are a few other things like tine finger's (pick-up teeth broken?) and twine disc's for wear. I would also look at the knife arm's, they have brass balls. You don't want any "flat spots" on them. I don't know this model well enough to know how it feeds the chamber. If it uses a tine bar, you might check for slack in the drive chain and see if there is any wear in the bolt where the tine bar hooks to the chain. Looseness here makes alot of racket. Makes sure that the bale chamber tension spring threaded rods are in good shape and don't have flat threads. Other things that wear are the twine tension plates. I can think of other things if you had problems... If you do purchase I suggest you make sure it has a pair (2 sets) of bale wedges or buy some. They can come in handy if your having trouble with mis-shaped bales.
Most of what I mentioned is easy fix stuff, but if you find problems maybe the dealer will take care of it. This is assuming this is a twine baler... I may have missed that someplace.
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