This is a A-AH173726 Inner Sheave, Cleaning Fan Driven, 8 3/8" PN: AH173726Main Description As Following : A-AH173726 Inner Sheave, Cleaning Fan Driven; 8 3/8" P.N: AH173726 Marked H178856Dim A (1): Dia: 8.375" O.D.Dim B (2): Bore Dia: 1.00"Replaces: AH75844, AH100009 Replaces: AH100009 JOHN DEERE COMBINE , Crossed From: AH75844 JOHN DEERE , AMAH100009 , , AV103640 VAPORMATIC , WN-AH173726 , , WNAH173726 , Found in Section & Models : Separator Area > Separator Area, John Deere COMBINE: 3300, John Deere COMBINE: 4400, John Deere COMBINE: 4420, John Deere COMBINE: 6600, John Deere COMBINE: 6601, John Deere COMBINE: 6602, John Deere COMBINE: 6620, John Deere COMBINE: 6622, John Deere COMBINE: 7700, John Deere COMBINE: 7701, John Deere COMBINE: 7720, John Deere COMBINE: 7721, John Deere COMBINE: 8820, Separator Area > Separator Sprockets and Sheaves, John Deere COMBINE: 3300, John Deere COMBINE: 4400, John Deere COMBINE: 4420, John Deere COMBINE: 6600, John Deere COMBINE: 6601, John Deere COMBINE: 6602, John Deere COMBINE: 6620 Associated Items : New Also A-JD-O-OMH111330, A-JD-O-OMH120048, A-JD-O-OMH111330, A-JD-O-OMH120048, A-JD-O-OMH111330, A-JD-O-OMH120048 And : Marked H178856 Bore: 1.00" Bore Type: Round Outside Diameter: 8.375" Replaces: AH75844, AH100009