Hello, I have just installed the rebuild kit for my liftmaster opener, (yr 2000). I have adjusted the springs so the door will hang still four feet off the ground. I degreased and relubed all parts-chain, wheels, pivot points, etc. Now the problem is when I activate the opener the door only travels about one foot, then stops and reverses.????
Thanks in advance,
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Gear kits can be purchased for chain drive machines from any of these 3 brand names ...Liftmaster/sears craftsman /chamberlain / All 3 of these brand names are manufactured by Liftmaster the worlds largest maker of garage door openers and related parts ! You can purchase a gear kit on ebay for around $30 or less depending on the seller ! If you go to garage door parts sites it will be slightly higher so your best bet is EBAY , The gear kit only requires the main gear and sprocket housing that attaches with 3 screws , just remember after the gear is installed that you run the motor co that the trolley starts in the door down position otherwise you risk having the trolley smack into the opener , this is crucial for any travel adjustments that are made later! Hope this helps you ,sincerely Glenn
Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?
There is an antenna extender kit available for your opener. The part number is 41A3504 and should be available from any good door opener company that handles Liftmaster or Chamberlain. It should come with instructions.
It sounds like the opener is stopping because the weight of the door is tripping the lift sensor on the opener. There are two screws on the side of the opener to adjust the lift and close pressure. Find the lift pressure screw and ajust it higher to see if that remedies the problem.
Also, because you said the door will not stay open at the top when you open it manually, I think your springs are not adjusted correctly. They should hold the door open in the up position when not connected to the door opener. That may be the reason the opener lift pressure is kicking it out.
If you have to adjust the springs, be careful that you know what you are doing. There is a lot of potential for getting hurt if you don't know the proper proceedure.
It sounds like you may have a spring problem. Release the door from the opener and see how it acts manually. Open it as far as the opener does and then see what happens when you release it. Also the weight of the door should give you a clue.
The door obstacle detector(reversing switch) needs adjustment, or the down limit sensor needs adjusting, or one of the lift springs is loose or broken. First, remove power from the opener, pull the red door release rope, and try to lift the door up manually. You should be able to lift it all the way open with litle effort. If it opens ok, pull the door down about halfway and let go. If it is properly balanced, it should stay where you left it. If the door fails either one of these tests, it needs spring replacement or adjustment. If the door moves ok, refer to your owners manual on how to adjust the reversing switch, linit switches, and photocell sensors at the door bottom.