George There was fix as fail warranty issue with the electric clutch bolts on the JD 275, JD 325 and the GT 262 when they were new. The bolts would shear like yours did. Go get the CORRECT bolt from JD. This was an issue until they changed the bolts supplied. Then make yourself a cylinder stop or use rope in the spark plug hole and then torque it to specifications. Many of the failures I have seen on these mowers, now that they are older, is when someone uses an impact wrench to tighten them. Use a Good torque wrench and tighten it to 60 Ft. Lbs. Also the factory bolts come with thread lock on the threads. IF you use an none OEM bolt you the medium strength Loctite on the bolt.
PS if you where able to get the broken piece out with out drilling it then the bolt worked lose and that cause the fatigue crack/failure you had. It was common on these when they where new.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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