Whenever I step onto my treadmill the belt stops right where it is and this ungodly scream/squeal/screech fills the room. I have tightened the walking belt, loosened and greased everything to no avail.

Could it be the motor belt does not have enough tension? Everything moves fine until I step up on the deck and then the belt and rollers stop and the screaming begins. Is there a way to increase the tension in the motor belt or do I have to buy a new one?

Thanks a million in advance for any advice

Get a refund.

I use to have a elliptical machine a long time ago that made that odd sound.

The drive belt from your motor to your front roller flywheel is loose. You need to have a professional tighten the belt or replace the belt. Its not a major problem, however you need a bit of technical knowledge about treadmills to do it yourself.

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Could also be your front roller. Sometimes the front roller separate from the flywheel pulley. This also causes slippage. It could be a combination of your walking belt, drive belt and front roller. If you're in NJ or NYC area give Techmotion a call.