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Chamberlain HD420EVP User Manual

Chamberlain HD420EVP
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6
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 of the opener.
1. Inserta 1/4"-20x1-3/4" bolt into the cover protection bolthole on the back end of the rail as
shown.Tighten securely with a 1/4"-20 locknut.DO NOT overtighten.
2. Remove the bolts from the top of the motor unit.
3. Use the carton to supportthe front end 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 bracket with the previouslyremoved bolts ; DO NOT use any power tools.The use
of power tools may permanently damage the garage door opener.
6. Attach chain spreader to the motor unitwith two screws.
HARDWARE
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
“U” Bracket
Hex Screws
8-32x7/16
SLIDE RAIL TO
STOPS ON TOP AND
SIDES
Cover
Protection
Bolt Hole
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
Bolts (Mounted in the
garage door opener)
Chain
Spreader

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Chamberlain HD420EVP Specifications

General IconGeneral
BrandChamberlain
ModelHD420EVP
CategoryGarage Door Opener
LanguageEnglish

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