Item#2 Gear and Sprocket Assembly

Liftmaster - Gear & Sprocket Assembly Part #41C4220A Item #2 (Illustrated diagram)

This part is the easiest way to replace the gear. Remove the chain, remove the three screws from the top plate, remove and replace the entire assembly.

The typical cause for worm gear failure is: lack of lubrication, a garage door that's out of balance, or the door slams to the floor in the "down" cycle.

Maintenance: Lubricate the drive and worm gear periodically, adjust the "down" limit switch to meet the floor without slamming, keep garage door springs adjusted for proper balance or replace springs if necessary. Lubricate all garage door hardware, rollers, sheaves and track radius.