Originally Posted by Ralph77

Like I said when doing it by eye/hand and then checking with the gauge it is amazing how far off it is from spec.
I always use the low ends on the specs for the belt. So a new belt is 180 to 200. I use 180.
And I want to say when I first did it by hand, thinking I was close, and then checked with the gauge that I was 80 lbs low.
So long ago I can remember for sure but it was pretty far off.
And like other people were saying. Could be grit on the pulleys or the belt.
Could be a pulley itself.
Could just be a bad belt. Hell even new parts out of the box have been known to be defective.
I don't really recall you saying if the belt was new or not or what brand it was.