Chamberlain 3500D Attach the Rail to the Header Bracket

Header Wall

Header Bracket

Belt Pulley Bracket

Torsion

Spring

Rail

Garage

Door

Foam Packaging

INSTALLATION STEP 3

Attach the Rail to the Header Bracket

•Position the opener on the garage floor below the header bracket. Use packing material as a protective base. NOTE: 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 rail to clear the spring.

•Position the rail 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"

Belt Pulley Bracket

Rail

Opener Carton or

Temporary

Support

HARDWARE SHOWN ACTUAL SIZE

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

Contents

For Residential Use Only Introduction Assembly Installation Adjustment Operation Preparing your garage door Tools needed Page Carton Inventory Hardware Inventory Attach the Rail to the Motor Unit Set the Belt Tension Attach the Belt Cap Retainer Determine the Header Bracket Location ONE-PIECEDOOR WITHOUT TRACK NOTE: EXAMPLE Install the Header Bracket Attach the Rail to 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 Be sure power to the opener is disconnected Garage door track installation (preferred) (Figure 1): Wall installation (Figure 2 and 3): Floor installation (Figure 4): 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: Program the Travel Limits Setting the Force Test the Safety Reversal System Test The Protector System® Using Your Garage Door Opener Page CARE OF YOUR OPENER MAINTENANCE SCHEDULE Once a Month THE REMOTE CONTROL BATTERY Once a Year Having a Problem? (Continued) To Erase All Codes From Motor Unit Memory *3-ButtonRemotes Page Page Motor Unit Assembly Parts Page LIFTMASTER GARAGE DOOR OPENER FIVE-YEARLIMITED WARRANTY LIFETIME MOTOR AND BELT LIMITED WARRANTY