LiftMaster 8500W Owners Manual - Page 7
Assembly, 1 Attach the Collar to the Garage Door Opener
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Assembly 1 Attach the Collar to the Garage Door Opener To avoid installation difficulties, 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 set 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. Securely tighten the 2 square head set screws closest to the motor shaft by turning the screws 1/4 - 1/2 turn after making contact with the motor shaft. 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. Motor Shaft Collar Set Screws 7