The walking belt may be loose. adjustment screws are at the back of the walking belt. one on either side
SOURCE: Does anyone know how to remove the plastic foot
you must remove the screws allens including those found beneath the label. be careful when lifting
SOURCE: I have a NordicTrack c2200. I find that the tread
There are a couple possibilities.
Remove the motor cover and run the machine.
Check the tension of the motor belt. It may need to be tightened. 
Check that the pulley has not broken free from the front roller by stopping the walking belt when the machine is running. If the belt stops, but the motor and pulley keep turning, the pulley has broken free from the front roller.
If this is the case, with a drill and small drill bit, drill a hole through the pulley and roller on the inside edge of the pulley, between the ribs (not where the motor belt travels) and put a screw through the plastic into the metal roller.
Otherwise, change the roller.
Good Luck.
SOURCE: NordicTrack treadmill squeaks when walking but fine when running.
1) lube the deck belt, and possible the deck is worn must be replace
2) lube the rollers bearing too.
3) test the bearing motor, need replace too.
God bless you
see the video attached: God bless you
see the video and proceed according, use the common sense.
God bless you
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