The knotters on a JD 14T are just adjusted like the ones used clear to date. Your dealer more than likely does not have anyone that has worked on many square balers. You need a few gray hairs on your head from working on a few to get them set correctly.
There are three JD dealerships around me. One has an older mechanic than can work on them and get them working in a timely manner. The other two put the youngest and least experienced mechanic on any balers they get. The Service managers at both dealers says they can't afford to put a good tech on a $1000 piece of equipment.
Needless to say I get a lot of knotter work from their customers. The sad thing is, until these two dealerships got bought out by one BIG chain, they would admit that they did not have the people to do it correctly. I have done a lot of knotter work right in their shop. They would call and asked me if I would come and work/train some of their guys on knotters. Now that big chain managers will not have any one but JD "certified" mechanics do any repair. Well it is funny that I have the certifications. They just don't show on JDs computer because I did the classes in the late 1980s before they kept the records.
What they are doing is making the local New Holland dealer a lot of money. He is getting most of the new square balers sold. He has three guys that a pretty good on balers. Plus they will ask/and give help. Just a few weeks ago they had a JD 348 traded in that was not tying correctly. I went up and fine tuned it for them. My pay was lunch with the store owner. We help each other when we get stuck on things.
The new JD management type don't like to work that way. They think they are losing income by helping any outside shop.
I bet that you will never take a piece of equipment in to your dealer again to be repaired if you can help it. You are going to be paying more than your baler is worth in a shop ticket. You Can NOT have a shop charging $75-$100 an hour working on a 50 year old baler.