FIELD: the invention is to be used in a piston pump. SUBSTANCE: pump has motor 12 with shaft 20, which changes into eccentric 32 for drive of at least one piston 56. To provide a stable support of eccentric 32, motor shaft 20 has ball bearings 36, 38 on both sides of eccentric 32, which are installed in common bearing member 40 of the eccentric so as to prevent misalignment. To accomplish a trial start of pump motor 12, irrespective of the pump body, it is offered to connect eccentric bearing member 40 to frame 16 of pump motor 12. EFFECT: motor may be started without installation of the pump. 7 cl, 4 dwg
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