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Location: Sassamansville, Pa
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Belt squeaking can be causes by dirt/debris/grease in the ribs of the belt or pulleys.
As belts get older with use, they stretch. This is where the tentioner pulley comes into play to take up the slack. It maybe possible the new tighter belt put enough tension on the pulley system to stop the squeaking, now as you belt stretched, it found that sweet spot where the tention pulley is not as strong and is putting less pressure on the bearings in the tension and idler pulleys.
You can look for visual signs of bad tension/idler pulleys. Look for grease splatter coming from the pulley bearing, and if they are really bad you can see brown rusty dust.
You can also try and clean the belt, remove the belt and use a bucket of soapy water (Dawn or a degreaser soap), then scrub out the ribs on the belt and pulleys then rinse with clean water and let dry. Reinstall belt.
You can also CAREFULLY use a stethoscope or a hose to pinpoint the squeak.
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