Yes, the one with the clutches.
Is the belt the exact size of the one taken off? Is it making any different sounds than before the problem. Sorry for all the questions?
Ok, the unit does have a 1yr warranty. I would highly recommend taking it to the dealer. Now you should not have taken the weights out though. Not that it's a bad idea or anything, it's just you modified the unit and they may no look at that unfavorably when trying to cover it under warranty.
The dealer should have given you a copy of the warranty, I would ask them for a copy. The dealer may be a multiline and used to the 6 mo warranty offered by other brands, the rep you spoke with may not have been aware.
Anyhow, keep us apprised of your saga!
Tony