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I bought a used John Deere TRS 22 snowblower that has been working great but the blades stop initiating. The sheer pins are in and new.The blades stopped working when I caught the corner of my lawn while snowblowing. Any ideas?
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Do I see a nail where a shear pin should be? Check the belts? I don't know JD but some makes have a shear pin on the shaft that drives the auger/impeller, maybe in the belt housing. If you don't have one, search for a manual online. If the motor runs and it propellers forward, you've narrowed the problem.
 

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I'd say that since the nail didn't shear, it's probably a part that a shear pin is designed to protect. Drive shaft, drive gear.....

Or did you put the nail in just for test purposes?
 
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