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LiftMaster 041A5434-13A Replacement Belt Kit for 8-Foot Garage Doors

The LiftMaster 041A5434-13A is a one-piece replacement belt assembly kit for select LiftMaster and Chamberlain belt-drive garage door openers installed on an 8-foot-high residential garage door.

This replacement belt restores the opener’s drive connection when the original belt is worn, stretched, frayed, damaged, or broken. It is intended for compatible belt-drive rail systems and should be matched to the original belt part number and opener model before ordering.

Product Features

• Genuine LiftMaster replacement belt assembly
• Part number: 041A5434-13A
• Also known as: 41A5434-13 and 41A5434-13A
• One-piece belt assembly
• Designed for select LiftMaster and Chamberlain belt-drive openers
• Intended for an 8-foot-high residential garage door
• Helps restore smooth and quiet belt-drive operation
• Suitable for replacing a worn, stretched, frayed, or broken opener belt
• Belt kit only

Important Size Information

The 8-foot designation refers to the height of the garage door the belt and rail system are designed to operate. It does not mean that the replacement belt measures exactly 8 feet in total length.

Do not select the belt based only on the measured length of the old belt. Confirm the garage door height, opener model, rail configuration, and original belt part number.

Compatibility

The LiftMaster 041A5434-13A is compatible with various LiftMaster and Chamberlain belt-drive garage door openers configured for an 8-foot-high residential garage door.

Compatibility must be confirmed using:

• The garage door opener model number
• The number printed on the original belt or belt assembly
• The opener owner’s manual
• The opener’s replacement-parts diagram
• The existing rail type and door-height configuration

Not every LiftMaster or Chamberlain belt-drive opener uses the same belt. Different opener generations and rail systems may require different belt assemblies, even when installed on doors of the same height.

Common Signs the Belt May Need Replacement

The replacement belt may be needed when:

• The original belt is broken
• The belt has visible fraying or damaged teeth
• The belt repeatedly slips during operation
• The trolley does not move when the opener runs
• The belt has excessive slack that cannot be corrected through normal adjustment
• The garage door opener makes unusual slipping or jumping noises
• The belt connection or tensioning hardware is damaged

Excessive belt slack or poor operation may also be caused by an incorrectly adjusted tensioner, damaged trolley, worn sprocket, loose rail, improperly balanced garage door, or another opener component. Inspect the complete system before replacing the belt.

Package Contents

• One LiftMaster 041A5434-13A replacement belt assembly kit

The garage door opener, rail, trolley, motor sprocket, pulley, mounting hardware, and other opener components are not included unless specifically shown or stated with the product.

Installation Requirements

Before installation:

• Disconnect electrical power from the garage door opener
• Disconnect battery power when applicable
• Confirm that the garage door is fully closed
• Verify the opener model and original belt part number
• Inspect the rail, trolley, pulley, and motor sprocket for damage
• Confirm that the garage door opens and closes smoothly by hand
• Follow the opener manufacturer’s belt-tensioning procedure

The belt must be routed and tensioned correctly. Excessive tension can damage the motor, sprocket, bearings, rail, or belt. Insufficient tension can cause slipping, jumping, noise, and unreliable door movement.

Installation and Safety

Disconnect the opener from electrical and battery power before servicing the belt or rail assembly.

Do not loosen or adjust garage door torsion springs, extension springs, lift cables, drums, or bottom brackets while replacing the opener belt. These components are under high tension and can cause serious injury.

After installation, reconnect the opener and test:

• Full opening and closing travel
• Belt alignment and tension
• Travel limits
• Force settings
• Safety reversing sensors
• Automatic reversal on contact
• Emergency-release operation

Professional installation is recommended when the opener model, belt compatibility, or cause of failure has not been positively identified.

LiftMaster 041A5434-13A Replacement 8-Foot Garage Door Opener Belt Kit

LiftMaster 041A5434-13A one-piece replacement belt assembly kit for select LiftMaster and Chamberlain belt-drive openers installed on 8-foot-high residential garage doors.