For some reason, the Liftmaster,Chamberlain,Craftsman Openers sub-forum is locked, so I post my dilemma here.
Our stalwart Liftmaster 3110 worm-drive GDO stopped raising the door. Upon activation, the thing clicks, the motor hums for half a second, then cuts off after another click; the diagnostic LED flashes five times.
The consensus within this forum and others recommend replacing the 48uF motor cap as the first t'shooting step. I ordered a replacement 30B0533 cap from Liftmaster and swapped it in with zero effect. Additionally...
1) I tested for motor bind by disconnecting the coupler with zero effect.
2) I disconnected the drive belt between the motor shaft and the worm drive with zero effect.
3) I checked for voltage at the conductors to the motor--there's juice when the activated, suggesting that the mainboard and power supply board both work.
4) I rocked the motor shaft back and forth with a pair of channel locks, suggesting that the motor isn't seized. Two items strike me as significant: The motor is rather stiff when I turn it; and I can feel the motor attempt to twist against the channel locks when I activate it.
5) I contacted Liftmaster support and related each of the preceding items. They were stumped. (They also couldn't provide me a part number for the motor or send me a replacement.)
My current theory is the motor is simply gunked up with years of garage dust. I plan to remove the thing and blast it with some CRC QD Electronic Cleaner. If that doesn't work and the motor twist is still stiff, I may attempt to swap out the bearings.
Otherwise, I'm stumped.
Suggestions? Recommendations?
Our stalwart Liftmaster 3110 worm-drive GDO stopped raising the door. Upon activation, the thing clicks, the motor hums for half a second, then cuts off after another click; the diagnostic LED flashes five times.
The consensus within this forum and others recommend replacing the 48uF motor cap as the first t'shooting step. I ordered a replacement 30B0533 cap from Liftmaster and swapped it in with zero effect. Additionally...
1) I tested for motor bind by disconnecting the coupler with zero effect.
2) I disconnected the drive belt between the motor shaft and the worm drive with zero effect.
3) I checked for voltage at the conductors to the motor--there's juice when the activated, suggesting that the mainboard and power supply board both work.
4) I rocked the motor shaft back and forth with a pair of channel locks, suggesting that the motor isn't seized. Two items strike me as significant: The motor is rather stiff when I turn it; and I can feel the motor attempt to twist against the channel locks when I activate it.
5) I contacted Liftmaster support and related each of the preceding items. They were stumped. (They also couldn't provide me a part number for the motor or send me a replacement.)
My current theory is the motor is simply gunked up with years of garage dust. I plan to remove the thing and blast it with some CRC QD Electronic Cleaner. If that doesn't work and the motor twist is still stiff, I may attempt to swap out the bearings.
Otherwise, I'm stumped.
Suggestions? Recommendations?
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