John, did this tractor originally have or was added, a PTO that you could stop the tractor, but it still ran at full power ? I'm following this and I have the next series up, an early 640, 1954 model year tractor. Both the 640 and my 850 just have the standard design where you disengage the clutch to engage the PTO lever and it powers up once you engage the clutch. The kind where the overrun clutch is recommended because even though you'll disengage the clutch, it won't stop forward motion, the inertia of the drive train will propel you. Well, when using the rotary mower, I'd just drop it down so the stump pan would rub and that was my overrun clutch LOL ! It worked very well for me actually. Now the 660 and the 860, + 661, 861, you have the 2 stage clutch, that allows you to stop motion, but the pto remains powered, I'm just wondering what this NAA has and if it was one those not so common options. I get the repair, it will give you what you need, but NAA's/Jubilee's, were mostly like the 640/850 for example if I am correct. I have seen a Jubilee with an auxiliary transmission, and some other options, way back when, was a really nice tractor, but I forget what those other options were. Sounds like you stumbled onto something interesting from that junkyard.
I stand to be corrected anyways, but very nice post on this, thanks for taking the time !
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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