Gliderol
Worn or Stripped Drive Sprocket / Drive Gear
Gliderol garage door opener hums but door does not move; manual release allows door to move freely.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Stripped nylon drive gear inside opener head, Worn chain sprocket on motor shaft, Loose drive coupling between motor and rail, Excessive door load causing gear wear
How to Fix / Troubleshooting
Safety first: Disconnect power before opening the opener housing. Do not adjust door springs.
Steps to address non‑moving door with humming motor:
- 1. Confirm door moves freely: Use the Gliderol manual release to disengage the opener and move the door by hand. If smooth, the problem is in the opener drive.
- 2. Inspect chain/belt: With the cover removed, check if the chain or belt moves when the motor runs. If the motor shaft turns but the chain/belt does not, the internal gear is likely stripped.
- 3. Check drive sprocket: Look at the sprocket on top of the opener head or at the end of the rail. If teeth are worn down or the sprocket wobbles, it must be replaced.
- 4. Replace drive gear/sprocket: Obtain the correct Gliderol drive gear or sprocket kit. Disassemble the opener head as per service manual, replace the worn parts, re‑grease lightly, and reassemble.
- 5. Re‑set limits: After reassembly, reprogram travel limits and test several cycles.
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Repair Difficulty
Hard
4/5
Required Part
Gliderol Drive Sprocket Kit
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