Replacement Trolley Assembly for LiftMaster and Chamberlain Garage Door Openers Ensure smooth and reliable operation of your garage door with this replacement trolley assembly. Designed for easy installation, it directly replaces LiftMaster part numbers 041B38693A, 41B38691, 41B38693, 41B3869, and 41B38693A, eliminating compatibility guesswork and minimizing downtime. Key Features and Benefits: Direct Replacement Compatibility Fully interchangeable with the specified LiftMaster trolley assembly part numbers for a precise fit and trouble installation. Wide Model Fit Range Works seamlessly with numerous LiftMaster and Chamberlain belt drive garage door openers, including models 1270, 1280, 1280R, 2280, 2580, 2500, 2500B, 2500D, 2585, 8100, 8100M, 8200, 9200, WD822K, WD922K, WD912K, WD912KS, WD822KS, and others in the same series. HeavyDuty Alloy Construction Manufactured from a strength, wearresistant metal alloy that resists deformation, supports repeated daily operation, and handles the impact and stress of opening and closing without fatigue. CorrosionResistant Finish Specially treated with protective coating to prevent rust and deterioration, ideal for garages exposed to humidity, temperature changes, or outdoor conditions. Practical Applications: 1. for restoring an inoperative garage door opener where the original trolley assembly is worn, cracked, or damaged. 2. Suitable for upgrading existing equipment to a stronger, more durable component for improved longterm performance. 3. An preventative replacement during routine maintenance to avoid unexpected failure and costly repairs. Dimensions and Performance: This replacement matches the exact OEM specifications for size and design, ensuring compatibility with the opener rail and belt system. Its precision manufacturing supports smooth movement along the rail, reliable engagement with the drive mechanism, and consistent performance over years of use. With robust construction, corrosion protection, and wide model compatibility, this LiftMaster and Chamberlain replacement trolley assembly offers dependable operation and lasting reliability for residential and light commercial garage door systems.