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John Deere 820 Moco Haybine

G

gford286

Member
2 years ago we decided it was about time to replace the whole cutter bar on our haybine. We had been having problems with the piece that connects the cutter bar to the arm on the wobble box. It broke one day so I welded it back together. It lasted a little while then broke again. After repeating this a couple more time and 1 or 2 new ones we discovered it was the skid plate that sits underneath it that was the issue, it was bent and hitting the cutter bar. Replaced it. It still broke. Just took longer. Welded it and finished out last year. Started this year and all was good till today when it broke the new one that had been in there a month. I am getting really tired of taking it apart and welding it. Can anybody give me an idea on where to look for an answer to this mystery?
 
Are you referring to the head on the cutter bar (where the pin goes in)? Years ago I had a similar problem on my 1209, when my father replaced the guards he put the wrong one on the cutter bar head end. It needed to be a high arch style guard to allow the bar to go back and forth. He put a standard guard on there and it caused the cutter bar to bind and break the head off. I welded the head back on three times before I realized that the wrong guard was installed. Look on jdparts.com and it should show you how the guards are laid out.
 
Hay Maker is right. The wrong guards for the first few places. Knife head has to go forward and back as it goes left to right as the
drive arm swings in an arc. See the OM as well as parts catalog. It is the wear bars on the guards that causes the problem. First few
guards don't have them.
 
we have not replaced any of the guards. They are all original to the mower. The only thing we did was put the new cutter bar on.
My father in law is thinking that we may need to replace all of the guards. I think it might be the pin. Or more the pin gets loose drops down just a little and puts the cutter bar in a bind.
 
I've been having the same issue this summer with our 720. The skid plate got bent up hitting the knife drive breaking it. I broke 1 drive I welded and 1 drive I broke twice that the local welding shop welded. I bet when it broke the first time I took guards off and put them back on in the wrong position. It had me scratching my head because the knife can be pushed in and pulled out by hand.
 
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