Underdrive pulley squeak

[jcgrant4]

I installed an underdrive pulley & smaller belts a little while back, and I've been unable to get it to stop squeaking. It's not a belt squeal, it's coming from the pulley base. Any ideas? Did I perhaps install something wrong? Has anyone else had this problem?

[swimshark]

Check the alignment of the belts and make sure they are in line with their corresponding pulleys. How much slack do you have in your belts?

[yodawill2000]

I ConcurBelts must line up exactly as they should be very tightly tensioned.I was surprised how tight they need to be even with a standard pulley.Any slight angle between pulleys will cause a nasty squeal. Especially with fresh belts.Look for glazing on both sides of the belts coming off the crank pulley.That will be a clue.

[jcgrant4]

Very little slack - about 1/2" deflection when pushed in the middle of the longest run on each. I'll check for glazing and try to eyball the alignment.

Thanks!

[yodawill2000]

1/2" is way too loose.1/4" is more like it.