LiftMaster 8550 8550 Manual - Page 9

Position the garage door opener, Attach the rail to the header bracket

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3 Attach the rail to the header bracket 3.1 Align the rail with the header bracket. Insert the clevis pin (H5) through the holes in the header bracket and rail. Secure with the ring fastener (H11). NOTE: Use the packing material as a protective base for the garage door opener. H11 H5 HARDWARE H5 Clevis Pin 5/16"x2-3/4" H11 Ring Fastener 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. 4.1 Remove the packing material and lift the garage door opener onto a ladder. 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. 4.2 Fully open the door and place a 2x4 (laid flat) under the rail. NOTE: 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 9

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9
3.1
Align the rail with the header bracket.
Insert the clevis pin (H5) through the
holes in the header bracket and rail.
Secure with the ring fastener (H11).
NOTE:
Use the packing material as a
protective base for the garage door opener.
H11
H5
HARDWARE
H5
Clevis Pin
5/16"x2-3/4"
H11
Ring Fastener
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.
4.1
Remove the packing material and lift the
garage door opener onto a ladder.
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.
4.2
Fully open the door and place a 2x4 (laid flat) under the rail.
NOTE:
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
3
Attach the rail to the header bracket