It sounds like what youâ€™re describing is a broken belt. If the dryer is heating but not tumbling I recommend checking the belt. Another possibility; drum binding up.
Please see the images provided below explaining how to check the belt.
SAFETY NOTICE: Be sure to disconnect power to the appliance before performing any repairs. If you are not comfortable with doing any voltage checks that might be recommended, please contact your local service provider for repairs. Be aware that there could be sharp edges inside the appliance that could cause cuts or other injuries to yourself or others.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services