Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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Mandrel chews pulley

I recently replaced the mandrel, housing and pulley on my craftsman lawnmower. Got my yard half mowed and the deck started to vibrate. Took the deck back off and where the mandrel and pulley conect it is all chewed up. Got new parts, replaced them and it did it again. Is it junk parts or am I doing something wrong when replacing it?

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  • Georgeson Apr 29, 2014

    Turns out that there is a washer that goes on the madrel pulley. if this is not there it will continue to strip the blades. Very important :-) Small thing not to loose.

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Are you sure the spindle is not bent and also are you balancing the blades when sharpening. Other then that make sure bolts are tight on the mandrel. With the deck off and standing up spin the blades and watch center of balde to see if something is bent. Also watch pulley on the other side to see if its bent.

Posted on Jul 25, 2009

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Check the spacer is below the pulley...I've read that the spacer is often installed improperly above the pulley which causes pulley and housing to destroy each other.

Posted on Jul 27, 2009

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I had the same issue and went through 3 pulleys
It turns out that when we changed the shaft the we forgot to put the washer/ spacer back on. It sits under the pulley. It's thicker so it raises the pulley a little to line up the teeth. Very important!
If this part is missing the pulley will keep stripping.

Posted on May 18, 2013

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