... reasonable selection of materials;easy maintenance, manufacturer AY oil pumpAY-type oil pump is reconstructed on the bases of old Y ... 250AYS150C50 ,250-inlet diameter (mm)A-first reconstruction, Y-centrifugal oil pump, S-first impeller double-suction,,material code of over ... back-to-back ball thrust bearing. Its bearing adopts oil slinger oil lubricating system. There is radiator outside bearing body, ...