Question about Sears LiftMaster Building Materials
Motor hums when energized but garage door does not open
Either the opener trolley is disengaged or you have a broken gear/sprocket assy.
Posted on May 08, 2014
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Posted on Jan 02, 2017
Thats one of the symptoms of a lightning strike or a power surge. Without actually being there I would suggest replacing the back-board. But as with lightning strikes and power surges sometimes other electronic components could have been damaged as well.
Posted on Jul 01, 2008
When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.
Posted on Dec 07, 2008
Likely the plastic gears are worn out. Unplug the unit from power source, remove the cover, look at the gears. If worn, it will be obvious from the shavings from the gears. You can buy the gear kit on EBAY for a little as $20 depending on the manufacturer and model. Before removing the chain drive, lock a pair of vice grips on the chain and metal chain rail to keep the chain from turning from its current position. The gears can be replaced without removing the opener. Even if you have to remove the opener, it is a simple task. Most have four bolts that need to be removed and it will be in you hands.
Posted on Jan 15, 2009
Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. The part number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.
Posted on Jun 07, 2009
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