I have the same unit. First, remove the hood. Then, the motor has an adjustment screw on the belt side of the motor. Loosen the nut a little, adjust the motor up or down to make the belt as tight as you can by hand, then re-tighten the nut. This always fixes mine.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
You may have a slipping motor belt. This is connected to the front roller.
The belt tightening 7 turns tells me the belt may now be damaged anyway .
Have a c1900 series , belt is slipping, how to fix??
Danielle
SOURCE: Belt slipping on Nordic Track c1900
My belt is slipping I tighten both alan head screws to the max roughly 7 turns and still have the broblem
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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.http://electro-medical.blogspot.com/
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