Crushed plastic gears are a common problem with chain-driven garage door openers. Fortunately, the repair is not difficult or expensive, and should only take an hour of your time. Therefore, if you suddenly discover that the engine of your garage door opener seems to be working, but the door is not moving, the first thing to do is to check if it is worn. These are the steps necessary to inspect and replace the gears of the garage door opener.
Unplug the garage door opener. Pull the emergency release rope and then close the garage door with your hand. Remove the lid from the garage door opener.
Inspect the gears
Examine the white plastic gears. Do the edges look worn or crushed? If so, you must replace them. Find the make and model of your garage door opener, and then start buying a new gear kit. Amazon and other online retailers carry many popular gear kits, which vary in price from around $ 18 to $ 30. If you"re in a hurry, you should be able to find a kit at a local garage door dealer. A gear kit should contain two new gears, some washers and a grease tube. Some gear kits come with detailed instructions that will help guide you through the process. Others contain minimal instructions, if any, which is where this tutorial comes in.
If your examination reveals gears that appear to be in good shape, you may have a more serious problem with the garage door opener.
You may want to find a good repair person to get a professional opinion. Alternatively, you may want to continue and replace the unit, which may not cost much more than the person in charge of the repair will bill you.
Pick up your tools
A typical gear replacement will require the following tools:
- 1/4-inch driver nut
- 3/8-inch nut or socket driver
- Screwdriver or socket 5/16-inch, with extension
- 1/8 inch Allen wrench
- flat head screwdriver
- 5/32 inch stroke
- Loosen the circuit board
In some garage door openers, loosening the circuit board and letting it hang provide more room for work. Simply remove the screws and allow the plate to hang, out of the way.
Loosen the chain
The chain is attached to a tension bar. Use a wrench to loosen the nut on the rod. Keep in mind that you may need a second wrench or pliers to prevent the chain from turning.
Remove the gear set
Remove the screws that hold the gear set in place. Lift the whole assembly out of the unit. Next, you will have to remove the helical gear from the shaft. This gear is held in place with a pin, which is removed by touching a small blow with a hammer. If the pin is difficult to remove (and they do often), sprinkle some WD-40 on the pin and let it soak for a while. The worm gear attached to the motor shaft can be removed by loosening the collar fixing screws with a hexagonal wrench. Slide the gear and washers, and then remove the retaining screws on the motor.
Reassemble the gear set
Fix the new worm gear to the shaft. Reassemble and replace the motor assembly.
Now you need to install the new helical gear set. Place a thin layer of the grease included in the kit on the gear. With the gears in place, tighten the chain as indicated in the user"s manual. Replace the cover on the garage door opener, plug it back in and start enjoying your garage door opener in operation.
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