Assembly; Attach The Collar To The Garage Door Opener - Chamberlain 8500 Manual

Assembly

1

Attach the Collar to the Garage Door Opener

To avoid installation diffi culties, do not run the garage door garage door opener until instructed
to do so.
The garage door opener can be installed on either side of the door (see PLANNING section
page 3). The illustrations shown are for installation on the left side.
1. Loosen the collar screws.
2. Attach collar to the garage door opener motor shaft. The side of the collar with the
larger hole should be placed on the motor shaft. Ensure that the collar is seated all the
way on motor shaft until stop is reached.
3. Position the collar so the screws are facing out and are accessible when attached to
the torsion bar.
4. Tighten the screws on both sides of the collar equally to secure collar to the motor
shaft (to 12-14 ft./lbs. of torque).
NOTE: Do not tighten set screws until indicated.
Motor Shaft
RIGHT
Collar
Collar Screws
3/16 Hex
Key Wrench
WRONG
Set Screws
6
To prevent possible SERIOUS INJURY
or DEATH, the collar MUST be properly
tightened. The door may NOT reverse
correctly or limits may be lost due to
collar slip.