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Discussion Starter #1
Hey,

Has anyone here experienced problems with the chopper blades/knives letting go and flying out the back of the machine?

9760STS is the unit in question.

thanks,
oz
 

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Wow, that sounds very severe. Have you taken a look at the saftey procedures/ or have you checked what is holding the blades?

I will look into this, as it sounds very dangerous.
 

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Is this on a new machine or have the chopper knives/hammers been replaced or turned? Or is it the stationary knives that stick thru thru slotted sheet?

My experience has been with 8820 chopper knives but the chopper knife principal is basically the same for anything. If the instructions say to use a torque wrench to tighten the nuts to proper specs then that is what you should do.If they've just been turned they should have had a new bolt/bushing kit used.

We've found with the new bolt/bushing kits the outside knife bolts are too short to get all the threads of the nut onto the bolt to properly torque it and then the outside knives would fly out the back so we replace these with a slightly longer bolt and double nut it. Ofcourse this may have been remedied with newer combines. And it may be a completely different knife/hammer holder than what we've worked with.
 

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Try checking the nuts they are not only torqued but are locking nuts as well.Are the bolts coming undone or are the breaking.
 

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we run 3 9860 premiums with extra fine cut choppers.bushings on knives are too brittle.deere knows about this and is trying to solve the issue.update kit for out 06 model includes washers to keep the knife from flying out
 

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Discussion Starter #6
Thanks for the input! Its a 2005 model 9760STS, bolt holes on the blades look to become oblong (worn) and as mentioned above become brittle and out they go. Not a good thing if you are coming up behind the machine in a chaser bin or anything like that.
 

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They are aware of the problem, but seem to be taking their time fixing it. They'll go right through the windshield of a brand new 8530
 
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