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Squealing noises are either
* a worn or loose belt. replace the belt.
* an A/C belt idler bearing. Replace belt and idler.
* alternator bearing: replace the alternator.
* timing belt idler bearing(s). Replace the timing belt and all bearings (there's a full kit for this).
any time a vehicle has a hydraulic tensioner it should be replaced. most parts stores have a timing belt replacement kit. some have the idler pullies and the tensioner and belt. you should replace the water pump while you are in their.
If you have adjusted the tension on your belt to the max, it is more than likely time to replace your running belt. The running belt naturally stretches over time. I would suggest replacing the belt and flipping your deck. If the deck has already been flipped once, then you would need to replace the deck as well. Life Fitness Treadmill Belt and Deck Replacement Video 95T
Replace belts as needed, check for cracks on the sides of the belts or pieces missing from belt. A good belt should last 100,000 miles. and it is a good practice to replace at 100,000 even if it looks good. REPLACE ALL BELTS as needed.
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