of machine screws 58 or the like being received in holes 59 of end wall 54 and similar holes in the longitudinal end of casing 50 similarly end wall 56 is mounted to the opposite end of casing 50 as shown end wall 56 is integrated in a larger detail 57 referred to as a motor axle casing to be mounted to a motor casing housing a motor for driving the pump further casing 50 includes circumferentially spaced apart fluid inlet 60 and outlet 62 ports intercommunicating the interior cavity of the pump the rotor 64 of the machine is provided with a number of elongated vane slots 66 cut therein on the radius thereof and within these slots are mounted in freely slidable relation therein a plurality of vanes 68 the pump drive shaft 70 is press fitted into the rotor 64 or otherwise keyed thereto and is rotatably mounted in the end walls 54 56 as by means of bearings 72 74 in an alternative version the rotor and the pump drive shaft are fabricated as a single unit the bearings are preferably slide fitted to the end walls 54 56 and interference fitted to the rotor drive shaft combination 64 70 the rotor 64 is concentrically mounted and positioned with respect to the axis of the drive shaft 70 as shown in fig2 d but the shaft 70 is eccentrically mounted relative to the cylindrical.