You can change a billhook in a few minutes once you know how to do it, assuming the intermittent gear isn't solidly rusted to its shaft.
Drive out the cotter pin that holds the intermittent gear against the gears of the knotter frame. The intermittent gear is the big gear on the shaft that drives all the gears on the knotter. Push aside the washers that were between the cotter pin and gear, but keep them together in a group separate from the other washers on the shaft.
Unless the intermittent gear is anxious to slide away from the knotter frame, squirt it with penetrant from both sides. Tap it with a good size hammer from both sides. Repeat squirt. Repeat taps. Repeat. The gear is pretty robust, but don't tap against teeth or machined surfaces. Remove the small bolt that secures the knotter frame to the bale case and keeps it from rotating. If the intermittent gear will slide aside, you should be pretty easily able to drive out the pin that holds the billhook gear to the billhook. If the intermittent gear doesn't want to slide, you should still be able to drive out the pin by tripping the knotter and manually rotating the baler flywheel until everything is in the right position. It's harder, though.
If you need a new billhook and try to buy one, you will find it insanely expensive. Believe it or not, a billhook from a baler of another model or make, if you have one handy, will sometimes fit. AFAIK, almost any JD billhook will fit. Well worth the time it takes to find out, IMHO, but then, my time isn't worth anything.There are also at least two different billhooks for different diameters of twine, but getting an exact match to the other billhook may not be that critical if you can get the billhook reasonably enough.
Get the intermittent gear up snug to the frame when you slide it back, if you can sneak another washer in without the mechanism binding, so much the better. This is very important.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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