CONTENTS
Preparation. . . . . . . . . . . . . . . .2-3
Assembly . . . . . . . . . . . . . . . . .4-5
Installation . . . . . . . . . . . . . . . 6-13
Install the Door Control. . . . . . 14-15
Install the Protector System®. . 16-19
Power. . . . . . . . . . . . . . . . . . 20-21
Adjustments . . . . . . . . . . . . . 22-24
Battery Backup*. . . . . . . . . . . 25-26
Operation . . . . . . . . . . . . . . . . . 27
Features . . . . . . . . . . . . . . . . . . 28
Door Control . . . . . . . . . . . . . 29-30
Remote Control . . . . . . . . . . . 31-32
To Erase the Memory . . . . . . . . . 32
To Open the Door Manually . . . . . 33
Maintenance . . . . . . . . . . . . . . . 34
Troubleshooting. . . . . . . . . . . 35-36
Accessories. . . . . . . . . . . . . . . . 37
Warranty. . . . . . . . . . . . . . . . . . 38
Repair Parts . . . . . . . . . . . . . 39-41
* If applicable
ELITE Series
Garage Door Opener
LiftMaster
845 Larch Avenue
Elmhurst, Illinois 60126-1196
Please read this manual and the enclosed safety materials carefully!
Fasten the manual near the garage door after installation.
The door WILL NOT CLOSE unless the Protector System® is connected and properly
aligned.
Periodic checks of the garage door opener are required to ensure safe operation.
The model number label is located on the left side panel of your garage door opener.
This garage door opener is ONLY compatible with MyQ® and Security 2.0™
accessories.
DO NOT enable the Timer-to-Close feature if you are installing the garage door
opener on a one-piece door. The Timer-to-Close is to be used ONLY with sectional
doors.
NOTE: If you are installing the garage door opener on a one-piece door, visit
www.LiftMaster.com for installation instructions.
www.LiftMaster.com
Serial Number:
Date of Purchase:
Models
• 8550 - DC Belt Drive
with Battery Backup
• 8557 - 3/4 hp
Belt Drive
FOR RESIDENTIAL USE ONLY
Write down the following information for
future reference:
.