The ROP Shop replacement (2-Pack) Garage Door Opener Drive Gears Compatible w/Craftsman Chamberlain 41A2817 Specs - Bore Size: 1/2". Outside Diameter: 2 3/4". Number of Teeth: 32. Color: White. Refer to images 2 & 3 for more information Includes - (1) Drive Gear; comes as shown in the first image Fits/For 1984-current Liftmaster, Craftsman chain drive and belt drive operators. Also belt drive operators for Chamberlain, Sears Craftsman, Garage Master, Access Master, Master Mechanic, Security +, Estate Series, Raynor, Formula I, Whisper Drive, Wayne Dalton, Power Drive, & Billion Code garage door openers. NOT compatible with openers made before 1984. If your operator runs when you press the button, but the door won’t open, this is likely the part that needs replacing. This is the replacement gear only. You must apply a lubricating grease (not included) when installing this gear. Failure to grease, will result in the gear stripping out.

Please review all product information to ensure that this product is compatible with your unit. /p> Before processing a product for warranty, it must be verified as the correct part by the OEM part number(s) and/or model number(s). If you have any questions or concerns, please ask. A Message to the Customer The ROP Shop staff constantly strives to provide clear and concise product information. We understand that sometimes it can be difficult to confirm product compatibility. It is your responsibility to confirm this is the correct product you need; therefore, we encourage all customers to fully review the information provided in this listing prior to purchase. Any specific models stated in the listing are potential matches only and not a guarantee of compatibility. Nothing is worse than having to return a product, trust us…we get it. Let’s work together to avoid this! If you are unsure as to whether or not this is the correct product for your unit, please ask. If you seek assistance we will need as much of the following information as possible , if applicable, to help you find the product you are looking for: Model and/or Sub-model Spec and/or Type Number Code and/or Serial Number Year Engine Horsepower Our knowledgeable product specialists are always willing to help you verify product fitment. Stay rugged, my friend. -The ROP Shop Staff