If your garage door opener was manufactured prior to 1993 it is likely missing infrared garage door sensors and auto reversing capability.
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Page 1the chamberlain group inc.
Motor unit assembly parts rail assembly parts and installation parts for chamberlain belt drive garage door opener models b550 b550c b552 b552c liftmaster 8550 8550w 8550wl 8550wlb repair parts list and diagrams.
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Chamberlain group cgi the corporate parent company to liftmaster chamberlain merlin and grifco is a global leader in access solutions and products.
If you have an old chamberlain opener you might even consider replacing it with one that has all of the modern safety features.
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We design and engineer residential garage door openers commercial door operators and gate entry systems.
Security chain drive garage door opener owner s manual for 1 2 hp 1365m and 1355m.