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This is on a macdon fd 75 40ft double knife. On both sides the middle of the knife bar is bent back and it’s wearing the back casting of the guards to the point the section nuts and wearing on the hold downs. The header cutter bar is straight and has never been bent and we owned it since new in 2012. I’ve string lined the cutter bar and it’s all within specs for forward and back distance in the service manual. But what do you guys think is causing this?

The guards near the tail end of the knife bar seem to be good. It’s from the mid point to the knife head that have the most wear.

Or is this caused from straw pushing the cutter bar back and than it wear the back of the guards?

I also have a FD 70 that’s a year older and it’s doing the exact same thing.

Thanks in advanced


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That’s what they do. You’ll wear the back of the knife & guards out well before the wear on the cutting edge of the fingers will even be noticeable.
If there was a way of fitting HB “roller-guides” to a MacDon cutterbar ....... that would make a huge difference to longevity.
 

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That’s what they do. You’ll wear the back of the knife & guards out well before the wear on the cutting edge of the fingers will even be noticeable.
If there was a way of fitting HB “roller-guides” to a MacDon cutterbar ....... that would make a huge difference to longevity.
Your in different conditions than here if you think honeybee rollers will fix anything. Those stupid things seize in a week in our conditions.
On our fds by the time our knife bar gets bowed like that our knife sections and guards are totally effed so we just replace everything including the knife bar. Its a relatively cheap way to save on in season down time.
 
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