Chamberlain B4603TC Installation Manual 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
1.
protective base.
NOTE: If the door spring is in the way, you will 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.
2.
Align the bracket holes and join with a clevis pin as shown.
3.
Insert a ring fastener to secure.
4.
HARDWARE
Clevis Pin
Ring Fastener
5/16"x1-1/2"
Ring Fastener
Clevis Pin
STEP 4 Position the Garage Door Opener
To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door.
Remove the packing material and lift the garage door opener onto a ladder.
1.
Fully open the door and place a 2x4 (laid flat) under the rail. For one-piece doors without tracks, lay the
2.
2x4 on its side.
NOTE: A 2x4 is ideal for setting the distance between the rail and the door. If the ladder is not
tall enough you will need help at this point. If the door hits the trolley when it is raised, pull the
trolley release arm down to disconnect the inner and outer trolley. Slide the outer trolley toward
the garage door opener. The trolley can remain disconnected until instructed.
Connected Disconnected
15
2x4 2x4
All other
One-piece door
door types
without tracks