Chamberlain 1280 - 1/2 HP Attach the T-railto the Header Bracket

Installation Step 3

Attach the T-rail to the Header Bracket

Header Wall

Header

Bracket

Belt Pulley

Bracket

T-rail

• Position the opener on the garage floor below the
	Group, Inc.
header bracket. Use packing material as a
protective base.	Drive

Header Brac

If the door spring is in the way you'll need help. Have someone hold the opener securely on a temporary support to allow the T-rail to clear the spring.

•Position the belt pulley bracket against the header bracket.

•Align the bracket holes and join with a clevis pin as shown.

•Insert a ring fastener to secure.

Ring Fastener

Header Bracket

Clevis Pin

5/16"x2-3/4 "

Garage

Door

Hardware Shown Actual Size

Belt Pulley Bracket

T-rail

Temporary

Support

Clevis Pin
5/16" x 2-3/4"	Ring Fastener

Contents

Page Contents Assembly section - pages 6 – Installation section - pages 8 – Page Adjustment section - pages 24 – Page SECTIONAL Door or ONE-PIECEDoor with Track Installation ONE-PIECEDoor Without Track Installation Page Attach the T-RailTo the Opener Set the Belt Tension Attach the Belt Cap Retainer Determine Header Bracket Location ONE-PIECEDoor Without Track Install the Header Bracket Attach the T-railto the Header Bracket Position the Opener Hang the Opener Install the Multi-Function Door Control Panel Install the Lights and the Lenses Attach the Manual Release Rope and Handle Electrical Requirements Page Install the Safety Reversing Sensor (Receiving and Sending Eyes) Aligning the Safety Sensors Trouble Shooting Fasten Door Bracket All ONE-PIECEDoor Installation Procedure Connect Door Arm to Trolley All ONE-PIECEDoors Assemble the Door Arm: Adjustment Procedures for One-PieceDoors Open Door Adjustment: Decrease UP limit Adjust the UP and DOWN Limits Adjust the Force Test The Protector System® Test the Safety Reverse System Maintenance Schedule Activate the opener with any of the following: The Remote Control Transmitter The Door Control •The Outside Keylock or Keyless Entry. (See Accessories) If possible, use the manual release rope and handle To Add a Single Function Remote Control Model 81LM "Smart Single Function Remote Control To Change the Selected Push Button Situation Probable Cause & Solution The opener doesn't operate from either the door control or the remote control: Opener operates from remote control, but not from door control: The door operates from the door control, but not from the remote control: (continued) Rail Assembly Parts Installation Parts Opener Assembly Parts Page Garage Door Manual Release Rope & Handle Opener Terminals Operational Noise Receiver & Remote Controls LIFT-MASTERGARAGE DOOR OPENER ONE-YEARLIMITED WARRANTY LIMITED WARRANTY ON MOTOR - MODEL