Dragon Wholesaling 178 Series Instrukcja instalacji, obsługi i konserwacji - Strona 5
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Drukuj stronęIf 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