Can't help you on books except to ask dealers or the manufacturer for specifications.
The Welger I saw demonstrated at a farm show made a 4 x 5 bale extremly tight, probably made heavier bale than a regular 5 x 6 baler, but it took 80 hp to run it.
Bearings wear out on balers, so look for condition of bearings(probably have to hear it run, which is a good idea anyway).
If the sheet metal in the sides are worn thin and especiall if they have holes worn in them it is a well used baler and you should walk away from it.
It's sort of obvious when belts on a belt baler get worn, but the belts can go a long time looking pretty ratty. If a lot of the lacing is torn then that will be an expense. Generally, if you have to have the lacing replaced in one you need to have them all done so they all will be trimmed to right length.
When seeing it run, look at the end of the shafts to see if they wobble, wobbling means bent shaft. Don't listen to any bull about how long a bent shaft will keep working. If there is a chain drive sprocket on a bent shaft it is putting uneven stress on the chain.
Look at sprockets to see if they have been worn down to sharp pointed teeth. If they have they need replacing and probably the chain is worn out also.
Check condition of pto shaft. Look at gear box, check for leaks, be sure box is bolted to frame tightly.
Look for cracks in frame. Sometimes operator will try to close lid on bale that is not completely out of the baler which often cracks frame.
Finally, look for one with close, good dealer support.
BTW, round balers were pretty well perfected by 1990, not that new ones haven't been improved. Those made earlier than the late 1980s are suspect IMO in that later models are so much better.
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