QD top pulley needs a replacement

[BackCountryBob]

Much of the heat generated in the top pulley comes from casting the pulley rather than precision machining. I believe Gates specifies machining as the cogs will run true with less wear and vibration = cooler. This might contribute to drive shaft failures as well.

Of course a machined pulley wheel with spokes would be expensive but they may be able to run a machined top and a cast bottom combo.

A tensioner's primary function is to push the belt inward to force the belt to contact more pulley teeth around the perimeter, primarily on the top pulley. More teeth = cooler.

Food for thought.

BCB

 

[geo]

Cooling holes angled in to the bottom of the pulley teeth may be cool, lol pun, using the rotation to force air through.
My belt has never contacted the bottom of the pulley teeth.