This is a A-R34359 Coupler, Hydraulic Pump Drive Shaft PN: R34359Main Description As Following : A-R34359 Coupler, Hydraulic Pump Drive Shaft P.N: R34359 Dim A (1): 4.370" LongSpline Count: 14 Splines Replaces: AT42311 JOHN DEERE , Crossed From: AMR34359 , , WN-R34359 , , WNR34359 , , 108933 , Found in Section & Models : Hydraulic System Parts > Hydraulic Pumps, John Deere BACKHOE: 500A (IND), John Deere INDUSTRIAL/CONSTRUCTION: 500, John Deere INDUSTRIAL/CONSTRUCTION: 600, John Deere INDUSTRIAL/CONSTRUCTION: 760, John Deere SKIDDER: 440 (IND), John Deere TRACTOR: 3020, John Deere TRACTOR: 4000, John Deere TRACTOR: 4020, John Deere TRACTOR: 5010, John Deere TRACTOR: 5020 Associated Items : A-R34360, A-R34362, A-R45822, A-R46345 Also A-JD-S-SM2023, A-FRM-JD, A-JD-O-OMR34406, A-JD-O-OMR41753, A-JD-O-OMR46012, A-JD-O-OMR48271, A-JD-P-PC1115, A-JD-P-PC858, A-JD-S-SM2038, A-JD-S-TM1005, A-SMJD203, A-JD-O-OMR46934, A-JD-O-OMR48273, A-JD-P-PC1116, A-JD-S-TM1006, A-SMJD203, A-FRM-JD, A-JD-O-OMR34410, A-JD-O-OMR41754, A-JD-O-OMR46934 And : Dim A (1): 4.370" Long Spline Count: 14 Splines