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Chamberlain B500 - Fasten Rail to Motor Unit

Chamberlain B500
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7
Assembly
STEP 2 Fasten the rail to the motor unit
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the
top ofthe opener.
1. Inserta 1/4"-20 x 1-3/4" bolt into the cover protection bolthole on the backend of the rail as
shown.Tighten securelywith a 1/4"-20 locknut. DO NOTovertighten.
2. Remove the boltsfrom the top of the motor unit.
3. Use the carton to support the frontend of the rail.
4. Place the “U” bracket,flat side down onto the motor unitand align the bracket holes with the
bolt holes.
5. Fasten the “U bracketwith the previouslyremoved bolts;DO NOTuse any power tools.The
use ofpower tools may permanentlydamage the garage door opener.

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