First do you have a cogged belt or a Poly-V belt if it is the former a link belt is a direct fit, if the latter it is not. Be aware that SOME of these machines (ah the tight Chinese tolerances) have a section where the belt goes into the cabinet where the raw metal edge is very close to the belt and can wear a link belt due to its extra thickness.
As mentioned try watching the belt on spin-down and see if it is bouncing around.
You may also want to check the pulley aligment, it has known to be an issue too.
This jointer has always been plauged with these noise issues and it seems to be a different set of fixes that work on any given machine but its price seems to outweigh the issue when compared to the prices of the PM and Delta that don’t have any noise issues.
