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

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Need to replace carriage on stanley sd450 opener how is it done?

When opener tries to open the door the screw vibrates and it sounds as if the part in the carriage that is attached to the drive screw is stripped and the door will not open. The opener will close the door just fine. Also, the door opens and closes properly when it is not connected to the operator.

How do I replace the carriage assembly? The opener is a Stanley SD450 with a date code 96503

Thank you.

Tom

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  • laajala May 07, 2009

    Same problem. I haven't unbolted the screw drive section yet, but there seems to be a hard stop near the end which would prevent the carriage from sliding off.

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Please make sure you don't have broken springs first and that the door is balanced properly. If so you can replace the "Trolly" by disconnecting the arm from the opener, undoing the opener from the bracket that mounts it to the wall. This usually takes a 1/2 in wrench. Then swing the opener out far enough to slide the trolly off and replace it with a new one. Re-connect everything then re-engage the trolly.

Posted on May 19, 2009

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Amazing, I am facing the same problem this morning! The problem is the carraige assembly is stripped. The threads are good enough to push the door dow, but not to lift it. The real concern is that I replaced mine once already 3 years ago and now it is broken again. I am considering a new opener this time because either the door is too heavy for the stanley opener, or it is just a poor design.

Replacing it is easy, you just unbolt the screw drive section and slide the old off and the new on. The part isn't cheap. There are several places that have it on-line for $35. It is part number 49223.

Good luck.

Posted on Oct 25, 2008

  • William Freigruber Oct 07, 2014

    Actually the Stanley design is very good. If the carriage wears out quickly it's an indication that the tensioner springs are not evenly adjusted so that you can open the door easily with one hand.

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This part needs to be made to where the threads are deeper so it can make firm contact with the drive and should be made of harder plastic or steel

Posted on Nov 13, 2012

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