Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Craftsman 1/2 HP garage door opener. Working fine until last night, when it would not open the door past 5-6 in. After repeated attempts, opened door manually. Door opener CLOSED the unit, but (again) would not open it past 5-6 in. Outside temp was 90 degrees. This AM (cooler), tried the unit, and it worked fine for 3 attempts. On the 4th attempt, the unit again failed to clear past 5-6 in.
Took off cover and examined drive gears. All gears APPEAR ok (they engage, etc) and work fine to lower the door. All springs appear ok.
Could this be a sign that the unit (7-8 years) is about to die?
I had the exact same problem for the last couple days. I have a 1/2 hp craftsman garage door opener and fairly heavy garage door. The problem wasn't with the opener, but with the torsion springs, they weren't tight enough. So I followed the directions here, Link. I had to make my own adjustment rod out of an old piece of steel rod, which I had to grind down to fit in the holes of the collar. Be careful, this is a two-person job, so when I did it, I had someone stand on a step ladder next to me and they loosened the screws as I was holding the bar. In order to get the right amount of torsion, I first tightened both springs about a quarter turn, and then tried to lift the door manually. It still was pretty heavy, so I gave them both another quarter turn. That seemed to be just the right amount of torsion in the springs to lift the door the way it should. Again, be careful when tightening the springs, I wore safety glasses just in case something happened. Hope that helps. Like the other guy said before, you can also adjust the force that the opener applies to get the door open, however, keep in mind this puts more stress on the motor and chain, which could shorten the life of both components. If what I said here doesn't help, you can also get the torsion springs replaced, which may be a good solution if your springs are very old or very rusty.
Posted on Jun 22, 2009
If the door isn't unusually heavy when you open it manually then maybe an adjustment will help. On the back of the motor unit you will find the 'up force' control. Increase it 1/4 turn and try.
Posted on Jun 22, 2009
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Posted on Jan 02, 2017
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