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This seems to have fixed the problem. A longer run and no belt slap or belt dust.

I think I finally got the problem fixed. After replacing the bushings, I had less belt slap but I still had belt dust on the mower deck. While watching the belt run, I noticed the belt was riding very low on the idler. The shinny parts on the idler indicate the original belt ran low on the...

Ok, I stopped by the dealer tonight on my way home from work. I talked to them about the small vertical movement in the tensioning arm (<1/8"). They believe replacing the bushings and tighting up this movement will fix the problem. Parts come in next week. I'll let you know what happens...

Mower deck model: RCK60B-22BX OK, I did a little more troubleshooting today. I thought maybe a blade imbalance might be part of the problem. I ran the mower without the blades. Same problem. The tensioner pulley and arm do move slightly back and forth when running. I think this is just the...

Thanks. I'll check that out. Don't know how they would have gotten out of alignment. If I find something, I'll let you know.

I have a BX 2230 with a 60 inch belly mower. I purchased it new in 2005. The mower has about 250 hours on it. The mower belt was vibrating and contacting metal pars on the mower deck and rubbing against itself. The result was a black dust on the mower and the tractor. I didn't notice any...