... ; reasonable selection of materials;easy maintenance, manufacturer AY oil pumpAY-type oil pump is reconstructed on the bases of old Y-type ... 58 higher than that of old Y-type oil pump;3. AY-type oil pump has same structural model, installation size and scope ... ,250-inlet diameter (mm)A-first reconstruction, Y-centrifugal oil pump, S-first impeller double-suction,,material code of over-current ...