I haven't pulled the belt cover off yet, but I have the newest model with the 223cc engine. I noticed the last time it was being used, it was starting to make a bit of a squeaking noise in heavier grass, but even when this thing was new I noticed a slight clicking sound would develop after about 15 minutes of running. I guess once things got good and warmed up. Always with the blades running. It still cuts good, just making a little noise.
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