Have someone turn the baler over by hand and compare the knotter that's acting up to the one that's tying while you watch through one cycle. This will often narrow down the problem. Our 336 started doing what you are describing on one knotter this summer and I found a worn wiper arm shaft and bushing. The knotter that was tying had the arm replaced at one time while the one acting up was (I'm sure) the original. You can shim the arm to minimize the slack but it was too worn allowing the arm to "hang" too low and the wiper wouldn't always clean the knot off the billhook. I gave it a couple whacks to bend the arm up to wipe the billhook with more pressure. It would still miss maybe once every 800-1000 bales but it was near the end of hay and a thorough going over is on the agenda this winter.
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