Replacement Bearing for Bush Hog HMG Series Disc Mowers code 00770102. This is a sealed bearing that is the upper bearing on each blade drive pinion shaft, please see position 20 in the exploded view diagram. Part Number 00770102 We sell many replacement parts for the most manufacturers of hay tools, tillers, finish mowers, spreaders, 3-point hitch hay tedders and sickle bar mowers. 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.