Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Replaced sprocket and worm gear on chamberlain 1/2 opener

Put the chain back on and tryed it. the door foward hard then backed off i tryed the limits and the adjust nothing

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  • Anonymous Feb 22, 2009

    old unit hbw0777. after replacing drive/worm kit door in down position. when power switch was engaged chain jammed forward. had to remove chain recheck installation procedures. tried again, same results.


  • Anonymous Feb 22, 2009

    I replaced the sprocket/worm gear on my Lift-master 1255, but after replacing the chain, garage door goes up about 6 inches, and reverses closed automatically. None of the adjustment screws offer any difference!


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The easiest way to fix this would be to take the chain off the sproket with the door and the trolley in the down position. Next hit the wall button and pay attn. to weather the gear is turning clockwise, you want it to turn that direction, wait until the unit stops by itself, next put the chain back on and now you should be able to adjust the limits. otherwise you should call a local professional. They will usually service your door as well as fix your opener.

Posted on Feb 27, 2009

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1 Answer

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