Oh Snap!

[WESTERNAERO]

Is the thread bottoming out before the bolt shoulder is making contact? I don't see any marks or scoring from the auger flange or a washer on the shoulder area of the bolt.

[Cigalert]

Is the thread bottoming out before the bolt shoulder is making contact? I don't see any marks or scoring from the auger flange or a washer on the shoulder area of the bolt.

There is about 1/4" to the bottom. The bolts pictured were only in about an hour before snapping.

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[WESTERNAERO]

Are there drive dogs or pins from the shaft to the auger? Or are the bolts acting as the torsional(twisting) load?

[CampbellCarl]

....."When its moving it snaps".....Are you saying that you can hear a snapping noise while it's operating? I'm thinking a binding or alignment issue is causing the hook then bolts to give up. Are there any kind of alignment adjustments on the gear box (or whatever drives the hook)?