How to Fix / Troubleshooting

Safety first: Unplug the opener. Do not stand under the door while testing.

Steps to repair:

Check trolley engagement: Ensure the emergency release lever is in the engaged position so the trolley connects to the chain/belt.
Inspect chain/belt movement: Activate the opener briefly (with door disconnected). If the motor runs but the chain/belt does not move, the internal gear or sprocket is likely stripped.
Open housing and inspect gear: Remove the Motorlift cover and look at the main drive gear. If plastic shavings are present or teeth are missing, replace the gear and sprocket assembly.
Reassemble and tension: Install the new gear kit, apply supplied grease, reassemble the housing, and adjust chain/belt tension to manufacturer specs.
Test with door reconnected: Re-engage the trolley and run a full open/close cycle.

Garage door opener hums but door does not move; chain or belt does not travel.

Possible Causes