Upfront - I own a Jet supersaw and I like it a lot.
Now one of the most troubling things about this saw is the apparent number
of people who have had problems with the timing belt breaking. Its an 8
groove "Poly V-belt". I spoke to a Jet tech rep today. He readily
acknowledge that they had had problems, mostly in the early model
deliveries. "We had a rash of belts breaking, but it was sporadic". He
said there were two things contributing to failures
1. Someone at the factory was setting the belt too tight and they would fail
when the blade was raised up high.
2. Sawdust may get into the belt and cause premature failure.
He recommended inspection of the belt periodically to see if there is any
sawdust buildup. If so, use a toothbrush to clean it out. He also
recommended the use of a dust collector.