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Chamberlain 3275, 3275-267 Attach the to the Motor Unit, Attach the Chain Spreader, ASSEMBLY STEP, ASSEMBLY STEP

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ASSEMBLY STEP 1

Attach the to the Motor Unit

To avoid installation difficulties, do not run the garage door opener until instructed to do so.

To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener.

•Remove the bolt and lock nut from the top of the motor unit.

•Place rail onto the bolt mounted on the motor unit and align the back hole with the hole in the top of the unit.

•Fasten rail with the washered bolt and lock nut previously removed. Tighten securely. Remember to use only these bolts/fasteners! Any other bolts/ fasteners will cause serious damage to the opener.

•Cut tape from T-rail, chain and styrofoam.

•REMOVE STYROFOAM.

Lock Nut

T-rail

Hole

Washered Bolt 5/16"-18x1/2"

Styrofoam

ASSEMBLY STEP 2

Attach the Chain Spreader

•Attach chain spreader to the motor unit with two screws.

•Position chain over chain spreader and into the slot of the spreader. Wrap chain around the sprocket. If necessary, loosen the outer nut on the trolley to obtain more chain slack.

To avoid possible SERIOUS INJURY to fingers from moving garage door opener:

•ALWAYS keep hand clear of sprocket while operating opener.

•Securely attach chain spreader BEFORE operating.

Hex Screws 8-32x7/16

Chain

Spreader

Chain	Motor Unit
Spreader	Motor Unit
	Sprocket

Motor Unit

Sprocket

6

Contents

Page Introduction2-5 Assembly Installation7-22 Adjustment23-25 Operation26-30 Preparing your garage door Tools needed Planning Carton Inventory Attach the to the Motor Unit Attach the Chain Spreader Tighten the Chain Determine the Header Bracket Location Install the Header Bracket Attach the Rail to the Header Bracket Position the Opener Hang the Opener Install the Door Control Install the Light Attach the Emergency Release Rope and Handle Electrical Requirements Install The Protector System® INSTALLING THE BRACKETS Garage door track installation (preferred) (Figure 1): Wall installation (Figures 2 & 3): Floor installation (Figure 4): MOUNTING AND WIRING THE SAFETY REVERSING SENSORS ALIGNING THE SAFETY REVERSING SENSORS TROUBLESHOOTING THE SAFETY REVERSING SENSORS Fasten the Door Bracket ONE-PIECEDOORS Metal Doors: Connect Door Arm to Trolley ALL ONE-PIECEDOORS 1. Assemble the door arm, Figure 4: 2. Adjustment procedures, Figure 5: • Open door adjustment: decrease UP travel limit 3. Connect the door arm to the trolley: 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-MountedDoor Control To Open the Door Manually CARE OF YOUR OPENER LIMIT AND FORCE ADJUSTMENTS: Repeat the safety reverse test (Adjustment Step 3, page 25) after any adjustment of limits or force MAINTENANCE SCHEDULE HAVING A PROBLEM My door will not close and the light bulbs blink on my motor unit: 2.My remotes will not activate the door: My door reverses for no apparent reason: 5.My lights will not turn off when door is open: 1 FLASH FLASHES To Add or Reprogram a Hand-heldRemote Control To Erase All Codes From Motor Unit Memory *3-ButtonRemotes (315 MHz) To Add, Reprogram or Change a Keyless Entry PIN Rail Assembly Parts Installation Parts Motor Unit Assembly Parts ACCESSORIES 1702LM Outside Quick Release: 374LM SECURITY✚® 4-ButtonRemote LIFTMASTER ONE-YEARLIMITED WARRANTY LIFETIME MOTOR LIMITED WARRANTY