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Hello. I recently hit something with my older Toro 521snowblower and it blew the belt. Went to the toro dealer and got the replacement belt. COULD not get it on so I took the auger's tension pulley off, put the belt on, and replaced the pulley. Now the auger is always engaged. There is no bolt/nut to loosen anywhere to relieve any tension. The belt is toothed and I put it tooth side down. That seemed right, but I wasn't sure because the belt obviously came off when it originally broke.

Thanks.
 

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These belt grip on the sides, and your new belt will be considerably wider than the old, thus it will grip better. The teeth you speak of are designed to help the belt dissipate heat, and have nothing to do with grip. Perhaps your pulley brake needs adjusting/replacing, sometimes after a run in, it works as it should, or sometimes you can get some adjustment through the linkage.
 
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