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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Re: Liftmaster rack keeps stripping
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.
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The Liftmaster openers have 4 movement switches, a )opening and b) closing limit and c) opening and d) closing force. First check the door for smooth operation by opening the door by hand (disconnect from the opener with the release cord). Any binding should be felt this way. It is possible for a binding hinge, roller or torsion springs to add too much drag and cause the force switch to shut off the motor. Hinges, roller shafts and torsion springs should be lubricated at least annually with a non oily spray (silicone or teflon spray). Not WD-40 or 3-in-1! A light band of lube should be applied to the torsion spring coils. If the door can be operated smoothly by hand, then adjust the closing force switch 1/4 turn at a time. This is a safety device do not use it to overcome another problem!
Several things come into play depending on how far it opens. You could have a broken door spring, a bad drive gear or just an opener that is showing signs of neglect. If you can eliminate the springs and the gear then you might need to lubricate the roller bearings and all the door hinges. There is a control on the rear near where all those white wires go that can increase the force the motor will apply to open the door.
Check the door springs. You may have a broken spring. You can also remove the cover from the opener and check the drive gear. It is a white nylon gear and is just in front of the motor. May be stripped.
Try opening and closing your door by hand with the motor detached (detach it by pulling on the rope) It should open and close easily without a lot of effort. If it catches or is too heavy (possible broken spring) it will strip the gear. The door has to be working properly before you can attach an opener to it. If you lift your door up about waist high and let go of it . It should not go up or down but should stay in that position, This tells you that the springs are correctly adjusted
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.