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Yes, the 640 or 8n would run the baler just fine. In fact I think the baler and 640 were produced in the same years (designed for each other?), however.... My NAA, simular to the 640, did just fine baling light to med hay (windrow). Ran a few extra strokes, 20 vs the recc. 16, but did a fine job of it. Even pulled a wagon behind the baler (flat ground). But, in heavy thick rows it was a bear. First gear was just to fast. Feeds in more than the baler can push through. It would have been ok if I could have slowed down bout half. But I didn't have a O/U trans or optional live pto. If it even looked like it might be boggin down, I would have to be quick on the clutch, slip it out of gear (without the baler stopping), and let the baler catch up. Then back on the cultch, let the baler stop and put her back in gear. It help to back up a bit so the baler would be back up to speed before you hit the row again. Had to be very diligent about it in the heavy stuff where one rake pass made a huge windrow. BTW - Just out of courisity(sp) whats he askin? My #1 early 55, working, needed few minor repairs - $130, #2 58-59, working, needed nothin - $85 #3 ??, parts, - $75. I couldn't get a working NH for double all that around here.
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