Good point 2000mc. I'd be sure of the direction to loosen, and then use a good impact wrench with a tight fitting socket.
When I changed my crank pulley, I put a 2ft breaker bar on an impact socket, and then had to extend the breaker bar with 3ft long pipe. Even then, it took my entire body weight to break the bolt. My impact wrench wasn't even close to being up for the job.
You shouldn't have that much trouble on a 34lb spec bolt though.
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