Safety first: Unplug the opener. Support the door with the spring system and do not rely on the opener to hold it.

Verify door moves freely: Pull the emergency release and move the door by hand. If it is heavy or stuck, have the springs and hardware serviced before repairing the opener.
Inspect drive system: Remove the opener cover. Look for plastic shavings around the motor shaft and drive gear. Check the chain or belt sprocket for missing teeth or wobble.
Check trolley movement: With the door disconnected, try running the opener briefly (power restored). If the motor shaft turns but the chain/belt does not move, the internal gear is likely stripped.
Replace gear/sprocket kit: Obtain a Wayne Dalton-compatible drive gear and sprocket kit for your model. Follow the service instructions to remove the old gear, clean out debris, grease the new gear, and reassemble.
Re-test and adjust limits: After reassembly, reconnect the door, run a full open/close cycle, and readjust travel limits as needed.

Opener hums but door does not move; trolley does not travel along the rail.

Possible Causes