LiftMaster 41B5424 New-Style Belt Pulley Bracket Assembly

The LiftMaster 41B5424 is a replacement front idler-pulley and bracket assembly for select LiftMaster and Chamberlain belt-drive garage door openers equipped with a T-rail. Installed at the header end of the opener rail, it supports the belt and provides the front tensioning point for the belt-drive system.

Also referenced as LiftMaster 041B5424 and 41A5424.

Features

• Complete front belt-pulley bracket assembly

• Designed for compatible T-rail belt-drive openers

• Supports and guides the belt at the header end of the rail

• Helps maintain proper belt alignment and operating tension

• Replacement for worn pulleys, damaged brackets or seized pulley bearings

• New-style configuration used on select later-generation belt-drive systems

Compatibility

Used with select LiftMaster, Chamberlain, Craftsman and compatible Raynor belt-drive openers utilizing a T-rail assembly. Depending on production date and rail configuration, compatible models may include select:

• 2280

• 2500

• 2580 and 2585

• 3280

• 3500D

• WD822K, WD922K and WD912K families

Confirm the opener model, rail style, existing bracket shape and original part number before ordering. This new-style bracket is not automatically interchangeable with the older 41A3588-1 pulley-bracket assembly.

Common Failure Symptoms

• Squeaking, grinding or binding at the front of the rail

• Pulley that no longer turns freely

• Belt rubbing against the bracket or rail

• Belt repeatedly moving out of alignment

• Cracked, bent or loose header-end bracket

Package Contents

• Belt idler pulley

• Front mounting bracket

• Factory-associated pulley hardware supplied with the service kit

Belt, rail and header bracket are not included unless specifically listed.

Installation & Safety

Disconnect opener power and close the garage door before beginning. Release belt tension before removing the pulley bracket. Do not operate the opener with a damaged pulley, misaligned belt or loose rail.

After installation, tension the belt according to the opener manual and test the complete travel cycle, limits and safety-reversal system.