Remove the motor cover.
Run the treadmill and observe the operation. Try walking on the machine and again observe the operation.
There could be 1 of 3 things causing your problem.
1) the motor drive belt may be loose. Tighten or replace the motor belt.
2) the pulley may have broken free from the front roller. Drill a small hole through the pulley into the metal roller on the backside of the pulley, and drive a screw into it. (see picture).
2) the walking belt is too loose. Adjust the walking belt by the rear roller adjustment bolts.
I have also seen the drive pulley come loose from the motor, but that is very rare and unlikely..
If you need someone to service the machine, on the model/serial number tag is a phone number to the manufacturer. They will direct you to the authorized service company in your area.
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