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I have a customer that uses this tractor as a packing tractor. The two bottom bolts on the final drive have snapped off. Has anyone else seen this or know what causes it. I don't want to drop the axle and take apart the final to extract the bolts and have it happen again.
 

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Can you drill them and get an easy out in there? IME, most cap screws with the head broken off unscrew fairly easily. If at all possible, get someone with a lathe to make a sleeve to go in the hole to hold your bit centered. A head on the sleeve will allow you to easily move it from hole to hole. Drill the stud to 1/2 screw size.

My guess is the screw is broken where the unthreaded shank transitions into the threaded area.
 
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