Motor Coupling to connect the 250 Centrigual pumps and Pump Motor

The good service life of the pump and driver depends upon good alignment through flexible coupling. If the electric motor was mounted at the factory, the pump and motor were in alignment when shipped. The alignment between the driver and pump should be inspected after installation to ensure that transportation or other handling has not caused misalignment of the unit. Poor alignment may cause the failure of the coupling, pump, or motor bearings, or of either shaft.

The recommended procedure for coupling adjustment is by the use of a dial indicator, as illustrated in the following. The dial indicator is attached to one coupling half with the indicator button resting on the O.D. of the other coupling half to measure offset misalignment. To measure angular misalignment, the indicator is positioned so that the button rests on the face, near the O.D., of the other coupling half. Rotate the shaft and dial indicator one full revolution while the other shaft remains stationary and notes the T.I.R.Unless otherwise specified by the coupling manufacturer, offset misalignment should be limited to 0.4mm(0.005) inches and angular misalignment should be limited to 0.4mm(0.005)inches. Adjust misalignment by loosening the driver or pump mounting bolts and re-tightening or shimming as required.

(EVERGROW could supply Motor coupling+Coupling Rubber+Pump Coupling for 250 Centrifugal pumps.)

In areas where a dial indicator arrangement is not available, an adequate job of alignment can be done with a straight edge. This method is especially useful if the coupling used contains an all rubber drive element.

To check offset misalignment, lay the straight edge in line with the shafts on the O.D.’s of the coupling halves.There should be no gaps under the straight edge.

Check two locations 90º apart. Angular misalignment can be checked by measuring the gap between coupling half faces. There should be no more than 1/64″ gap under the straight edge or 1/64″ variation in the gap between coupling halves.

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