This listing is for one replacement Alamo / Servis Rhino rotary cutter gearbox old style tab type bearing adjustment nut, code 00759970, used to adjust bearing pre-load on the output shaft bearings. The tabbed locking nut was used on gearboxes from 1992 - 1996 on many of the Servis Rhino / Alamo gearboxes that used a nut at the top of the output shaft to adjust bearing pre-load. New OEM replacement part. The locking tab washers are also available in our online store. Nuts and cotter pins for the newer style shafts can also be found in our online store. Fits several of the Alamo / Servis Rhino / M & W gearboxes Replaces: 00759970 We sell many replacement rotary cutter parts. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.