Here are the diagrams and repair parts for Official Craftsman 13953724 8" garage door opener rail extension kit, as well as links to manuals and error code tables, if available.
There are a couple of ways to find the part or diagram you need:
Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.
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#NI
All parts diagram
Part #1A5249-1
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Part #183C158-11
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Part #1A995
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Part #26A53
The manufacturer no longer makes this part, and there's no substitute part
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Main causes: safety sensor beams blocked, safety sensors not aligned, downforce setting needs adjustment, damaged garage…
Main causes: loose fasteners, broken brackets, need preventive maintenance, worn drive gears, loose or worn belt, loose …
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