Description:

The ROP Shop replacement Gear & Sprocket Kit for Chamberlain 1/2 HP AC Chain Drive 4100, 4200 Openers. Specs - Large Gear: 2 3/4" x 1/2" with 1/2" bore. Worm Gear: 1 1/8" Outside Diameter with 1 1/4" wide teeth. Refer to images 2 & 3 for more information. Includes - (1) Gear & Sprocket Kit with Worm Gear, Grease, Motor Shaft Bearings, Sprocket Bearings & Hardware; comes as shown in the first image. Compatible with Residential Chamberlain, Liftmaster, Sears Craftsman, Master Mechanic and Garage Master, 1/2, 1/3, 3/4 HP chain drive models manufactured 1984 to present. Do NOT use for garage openers with dual sprockets on the output shaft; Not compatible with Sears openers made before 1984 - body color of powerhead unit: brown, green, or yellow.