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Q1: Sears GDO Limit Switches Q

Posted by cciaffone (My Page) on
Fri, Feb 27, 09 at 15:07

Got an older (10 years??) Craftsman GDO that has become
very inconsistent in how far up it goes. Anywhere
from 8 inches from the bolt, to almost up to the
bolt. But when I look at the limit switches, seems
like it's working as designed. Can the (internal)
travel-limiting switches "move" due to vibration.

Should mention: all internal gears look great, do not
seem to slip, and are well lubed.

Follow-Up Postings:

RE: Q1: Sears GDO Limit Switches Q

The limit switch assembly does move over a long period of time but not as often as yours is doing. The shaft that goes from the sprocket to the gear runs through a bronze bearing. That bearing bears the weight of the door when it is opening and it just may be moving enough to cause the gear that drives the limit switch assembly to miss sometimes. Believe me this is speculation on my part but I can think of no other reason for your problem.

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