Chamberlain 1265, 1265-267 1/2 HP Attach the T-Railto the Header, Bracket

INSTALLATION STEP 3

Attach the T-Rail to the Header

Bracket

	•	Position the opener on the garage floor below the
Header Wall		header bracket. Use packing material as a
Header Wall		protective base. NOTE: If the door spring is in the
		protective base. NOTE: If the door spring is in the
Header		way you’ll need help. Have someone hold the
Bracket		opener securely on a temporary support to allow
		opener securely on a temporary support to allow
Chain		the rail to clear the spring.
Chain
Pulley	•	Position the rail bracket against the header
Bracket		bracket.
		bracket.
	•	Align the bracket holes and join with a clevis pin
		as shown.
	•	Insert a ring fastener to secure.

	T-rail	Ring Fastener
	T-rail	Header Bracket
		Header Bracket

Clevis Pin 5/16"x2-3/4 "

Chain

Pulley

Bracket

T-rail

Garage

Door

DOWNINCREASE

TRAVEL

Temporary

Support

HARDWARE SHOWN ACTUAL SIZE

Clevis Pin
5/16"x2-3/4"	Ring Fastener

Contents

For Residential Use Only Introduction Pages Assembly Installation Adjustment Preparing your garage door Tools needed Planning Carton Inventory Attach the T-Railto the Motor Unit Attach the Chain to the Sprocket and Install the Sprocket Cover Tighten the Chain Determine the Header Bracket Location EXAMPLE One-piecedoor without track: jamb hardware One-piecedoor without track: pivot hardware Install the Header Bracket Attach the T-Railto the Header Bracket Position the Opener Hang the Opener Install the Door Control Install the Lights and Lens Attach the Emergency Release Rope and Handle Electrical Requirements Install The Protector System® INSTALLING THE BRACKETS Garage door track installation (preferred): Wall installation: Floor installation: MOUNTING AND WIRING THE SAFETY SENSORS ALIGNING THE SAFETY SENSORS TROUBLESHOOTING THE SAFETY SENSORS Fasten the Door Bracket ONE-PIECEDOORS Metal Doors: Connect Door Arm to Trolley ALL ONE-PIECEDOORS 1.Assemble the door arm: 2.Adjustment procedures: •Open door adjustment: decrease UP travel limit •Closed door adjustment: decrease DOWN travel limit Adjust the UP and DOWN Travel Limits Adjust the Force Test the Safety Reversal System Test the Protector System® Using Your Garage Door Opener Using the Wall-Mounted Door Control To Open the Door Manually Care of Your Opener Having a Problem Having a Problem? (Continued) To Add an Additional Hand-heldRemote Control To Erase All Codes From Motor Unit Memory *3-ChannelRemotes To Add or Change a Keyless Entry PIN Rail Assembly Parts Installation Parts Motor Unit Assembly Parts ACCESSORIES 1702LM Outside Quick Release: 982LM 1708LM LIFTMASTER GARAGE DOOR OPENER ONE-YEARLIMITED WARRANTY