Repair and replace parts on LiftMaster garage door operators. Action Industries has a variety of parts to work with LiftMaster, Chamberlain, and Sears Craftsman garage door opener powerheads. The garage powerhead contains all the important components to drive the movement of the garage such as the motor assembly. Whether repairs need to be done on a residential door, commercial door, screw drive, belt drive, or chain drive operator, we have the parts in stock. Available powerhead hardware includes transformers with wire harnesses, belt pulleys, sprocket kits, and more. LiftMaster, Chamberlain, and Sears Craftsman are all manufactured by the Chamberlain Group and have overlapping compatibility. Check your replacement parts diagram or manual to ensure you order the right parts for your operator.