... disc structure, axial piston variable pump, which is specially designed for the high efficiency hydraulic drive with open loop.1 ... 300, 355, 500, 750 milliliter per rotation (A4VSO300 is special designed for ceramic press)3.Angle indicator with bevel disc 4 ... Excellent sucking characteristic 5.Sensitive response control 6.The special designed long life and the high precision aviation roller bearing7. ...