Drop the deck and remove the belt and figure out wich one it is. make shure there all nice and tight in the bearings, no slop side to side. There not that hard to rebuild if you have the right sized wrench I think its 1 1/4 and a breaker bar to get the blade off. If you look around on here there is a NAPA part # for the bearing. Deck parts like springs and tensioners are easy to find on E-bay for most of the time thats all thats left of an old deck after they get rusty.
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"Good Dogs Never Live Long Enough!" Casey Angeletti
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