This is a A-R54503 Ring Gear, Flywheel PN: R54503Main Description As Following : A-R54503 Ring Gear, Flywheel P.N: R54503 Dim A (1): 115 TeethDim B (2): 13.437" I.D. Crossed From: WN-R54503 , , WNR54503 , Found in Section & Models : Engine Parts > Flywheels and Ring Gears, John Deere BACKHOE: 410B, John Deere BACKHOE: 410C, John Deere BACKHOE: 410D, John Deere BACKHOE: 415B, John Deere BACKHOE: 510D, John Deere BACKHOE: 610B, John Deere BACKHOE: 610C, John Deere BACKHOE: 710B, John Deere BACKHOE: 710D, John Deere COTTON PICKER: 9930, John Deere COTTON STRIPPER: 7445, John Deere COTTON STRIPPER: 7450, John Deere CRAWLER: 555A, John Deere DOZER: 550A, John Deere DOZER: 550B, John Deere INDUSTRIAL/CONSTRUCTION: 340B, John Deere INDUSTRIAL/CONSTRUCTION: 510B, John Deere INDUSTRIAL/CONSTRUCTION: 510C, John Deere INDUSTRIAL/CONSTRUCTION: 515B, John Deere INDUSTRIAL/CONSTRUCTION: 550 Associated Items : New Also A-JD-MCREPRO, A-JD-O-OMT54859, A-JD-S-SM2023 And : Inside Diameter: 13.437" Teeth: 115