I RECENTLY INSTALLED A GEAR KIT IN MY CRAFTSMAN 1/2 HP
DOOR OPENER.AFTER INSTALLING THE KIT THE DOOR ONLY OPENS APPROX 18-24 INCHES AND CLOSES IMMEDIATELY.I REMOVED THE CHAIN FROM THE TOP GEAR AND STILL ONLY
ROTATES A FEW TURNS.I HAVE ADJUSTED THE UP TRAVEL KNOB TO FULL NO DIFFERENCE,I ADJUSTED TO UP FORCE KNOB STILL KNOW DIFFERENCE.THE DOOR WORKED CORRECTLY BEFORE INSTALLING THE KIT .IAM STUMPED.HELP!
IS IT POSIBLY THE LIMIT SWITCH?
You say it only opens two feet?? Then closes?? If I may if you a little bit more costly option. Dont replace the gears. They used to be really good 8 years ago but the way they make the gears now there too soft and often strip out much faster. I would suggest that you do what we call a motor head change out. Take off your old chain drive motor head and buy a new one. Pretty simple. Two things though one always make sure you put the new one in with the door down. And the traveler in the down position ( The traveler is the metal thing hooked up to the chain) but far and your gear that you have it sounds to me that you dont have the gears close enough.. but 100 percent on that but a door should never close on it own. It's not safe.
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Chamberlain GroupFasten the manual near the garage door after installation. .... This garage door openerhas been designed and tested to offer safe service provided it is installed, ...
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
Make sure you put the black cup back on
the end of the motor shaft and that it is pressed all the way on.
Make sure the RPM sensor is plugged in. If neither of these are the
issue, then you probably did not have the motor shaft pushed all the
way back when you tightened the coupler after replacing the worm
gear. Loosen that coupler up and from the front of the motor
(opposite end in which the coupler is on) push the shaft back as far
as it will go. Hold it there while you tighten the coupler back up
and then try it.
If your keypad is the same age as your door and worked before it has probably just quit. If it is new and you have programmed it and it still doesn't work it may be the wrong one for your model opener.
The thing to do is remove the cover and watch the limit switch assembly. You should be able to see how it is supposed to work and determine what is wrong. A small gear on the end of the shaft turns the limit switch assembly to make contact and turn off the motor in each direction. Something may be broken or out of place. There is also a possibility your logic board is bad especially if you have had electrical storms recently.
Ok well the best advise I can give you is to open up your opener case should be a 1/4 nut driver or a Philips head screw driver. Make sure to unplug it first. Once the case is off, find a reqtangle black box with three white plastic screws they are what controls the limits. Chances are they got knocked off wheny ou were putting in the gear. check to make sure the wires are hooked up and find the placement of the limits make sure they can touch each other. Little tip I do for my customs is get a piece of sand paper and rub it agaist the metal contacts for the limits only. (after time lift master openers bind up a film and dont stop where they supposed to.) If your still not sure how the limits work plus in the opener and run it make sure not to put your hands inside the opener and nothing esle is in the way. Then adjest the limits as needed. That should take care of you if not go ahead and make another post ill check back with you.