Chamberlain RJO20 RJO20 Owner s Manual - English - Page 9

Installation (continued) 1 Attach the Collar to the Garage Door Opener The garage door opener can be installed on either side of the door; see "Is Your Garage Ready?" on page 4. The illustrations shown are for installation on the left side. 1. Loosen the preset collar screws with the 3/8" open end wrench. 2. Slide the collar onto the garage door opener shaft until it stops. 3. Position the collar so the screws are facing out and accessible when attached to the torsion bar. 4. Tighten the 2 square head set screws by hand until they contact the torsion bar.
Then, use a socket wrench to finish tightening the set screws by turning them 1/4 - 1/2 turn.
 5. Loosely attach slotted side of mounting bracket to the same side of the garage door opener as the collar, using screws provided. NOTE: Do not tighten mounting bracket screws until instructed. 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. YOU WILL NEED Collar Set Screws Screw #10-32 (2) Motor Shaft Collar Mounting bracket Socket Wrench 9