Use these basic steps to replace the drive motor in ProForm, Weslo, Horizon, Weider, Lifestyler, NordicTrack and Sole treadmills.
Shut off the electricity
Remove the motor hood
Remove the motor
Install the new motor
Reinstall the motor hood
Restore power
For more information, check this link:
https://www.searspartsdirect.com/diy/repair-guide/how-to-replace-a-treadmill-drive-motor