Chamberlain WD912K User Manual download pdf (Page 15)

INSTALLATION STEP 3

Attach the Rail to the Header

Bracket

• Position the opener on the garage floor below the

header bracket. Use packing material as a

protective base.

NOTE: If the door spring is in the way you’ll need

help. Have someone hold the opener securely on

a temporary support to allow the rail to clear the

spring.

• Position the rail bracket against the header

bracket.

• Align the bracket holes and join with a clevis pin

as shown.

• Insert a ring fastener to secure.

Header

Bracket

Belt Pulley

Bracket

Temporary

Support

Header Wall

Garage

Door

Clevis Pin

5/16"x2-3/4"

Ring

Fastener

Header

Bracket

Belt Pulley

Bracket

Rail

Clevis Pin

5/16" x 2-3/4"

Ring Fastener

HARDWARE SHOWN ACTUAL SIZE

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 39 40

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Chamberlain WD912K User Manual Page 15