Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Liftmaster rack keeps stripping

I have a Liftmaster and the rack keeps stripping out. We have had new springs and ballbearing rollers put in, but it still keeps stripping. We have to put in a new rack about every 7 to 8 weeks. Why does it keep doing this? It is a 1/2 hp on a 18ft garage door. It worked fine the first 8 years after building the house. Then all of a sudden it starts the stripping thing.

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What do you mean by rack. do you mean fears. do you have right sprigs on door, is door balanced. lift half way and let go (Disconnected by arm). It should stay put or go slowly up or down. If not, springs are bad, I put a 1/4 hp on 18' wood door. lasted 27 years so far. H/p not the problem.

Posted on Jan 15, 2009

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Have you looked on both sides of the door at the bottom there should be cables. If they are not tight you probably have a damaged spring. Look up between the door and where the roller mounts are, there should be a tightly wound spring. This is what keeps the door up, if tension is lost then it will come back down. If it is broken it needs professional attention.

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