Dragon Wholesaling 178 Series Installation, Operation And Maintenance Instructions - Page 5

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If the electric motor was mounted at the factory, the pump and motor were in alignment when

shipped. The alignment between the pump and driver should be inspected after installation

to ensure that transportation or other handling has not caused misalignment of the unit. Poor

alignment may cause failure of the coupling, pump, motor, or bearings. Alignment must not be

attempted until the base is in position and the mounting and flange bolts have been tightened.

The recommended procedure for coupling alignment is with the use of a dial indicator, as

illustrated in Figures 1 and 2. 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 mea-

sure angular misalignment, the indicator is positioned so that the buttons rest on the face, near

the O.D., of the other coupling half. Rotate the shaft and dial indicator one revolution while the

other shaft remains stationary and note the T.I.R. Unless otherwise specified by the coupling

manufacturer, offset misalignment should be limited to 0.005 inches T.I.R. Adjust the alignment by

loosening the pump or driver mounting bolts and retighten or shim as required.

Figure 1

Measuring Offset Misalignment

with a Dial Gauge

In areas where a dial indicator arrangement is not available, an adequate job of alignment can

be done with a straightedge. This method is especially useful if the coupling used contains a rub-

ber drive element.

To check offset misalignment, lay the straightedge in line with the shafts on the O.D.'s of the cou-

pling halves. There should be no gaps under the straightedge. Check two locations 90 degrees

apart. Angular misalignment can be checked by measuring the gap between coupling half faces.

There should be no more than a 1/64 inch gap under the straightedge or a 1/64 inch variation in

the gap between the coupling halves. See Figures 1A and 2A.

Measuring Offset Misalignment

Using a Straightedge

Note: Further reference on coupling alignment can be found in Hydraulic Institute

Standards, 13th edition, pages 177, 120.

Figure 1A

Measuring Angular Misalignment

with a Dial Gauge

Measuring Angular Misalignment

Using a Straightedge

Figure 2

Figure 2A