Pulley, Crankshaft (3 Groove). PART NO: A-74037126. Replaces 74028472 Dim A (1)7.562" O.D. Dim B (2)3 Groove. . MODELS: Allis-Chalmers TRACTOR: 7030 Allis-Chalmers TRACTOR: 7040 Allis-Chalmers TRACTOR: 7045 Allis-Chalmers TRACTOR: 7050 Allis-Chalmers TRACTOR: 7060 Allis-Chalmers TRACTOR: 8030 Allis-Chalmers TRACTOR: 8050 Gleaner COMBINE: L Gleaner COMBINE: L2 (SN < 70-07546) Gleaner COMBINE: L3 (SN < 70-07546) Gleaner COMBINE: MH2 Gleaner COMBINE: MH3.