Figure 7: Checking Parallel Alignment
NOTICE:
Care must be taken to have the straight edge parallel to the axis of the shafts (Figure
Checking
Parallel Alignment
).
Angular and parallel misalignment are corrected by means of shims under the motor mounting feet. After
each change, it is necessary to recheck the alignment of the coupling halves. Adjustment in one direction
may disturb adjustments already made in another direction. It should not be necessary to adjust the
shims under the pump.
The permissible amount of misalignment will vary with the type of pump and driver. The manufacturer’s
recommendations should be obtained and followed.
When the driver is to be mounted on the sub-base in the field, it is necessary to place the subbase with
the pump on the foundation to level the pump shaft, to check the coupling faces, the suction and dis-
charge flanges for horizontal or vertical position, and to make any necessary corrective adjustments.
When the units are lined up cold, it may be necessary to make an allowance for the vertical rise of the
driver and/or pump caused by heating.
Alternate method of alignment
An approved method for putting the coupling halves in final accurate alignment is by the use of a dial
indicator. Check alignment by straight edge, taper gauge or feelers as accurately as possible by proce-
dure indicated above.
Bolt the indicator to the pump half of the coupling. With the indicator button resting on the other half cou-
pling periphery, set the dial to zero, and chalk mark the coupling half at the point where the buttons rest.
For any check (top, bottom, or sides) rotate both shafts by the same amount; i.e., all readings on the dial
must be made with button on the chalk mark.
The dial readings will indicate whether the driver has to be raised or lowered or moved to either side.
After each movement, check to see that coupling faces remain parallel to one another.
With this method, accurate alignment of shaft centers can be obtained even where faces or outside di-
ameters of the coupling halves are not square or concentric with the bores, provided all measurements
for angular alignment are made between the same two points on the faces, and all measurements for
parallel alignment are made between the same two points on the outside diameters. Gross deviations in
squareness or concentricity, however, may cause problems due to the coupling unbalance or abnormal
coupling wear and may need to be corrected for reasons other than accomplishment of shaft alignment.
2.3 Pump Driver Alignment
Model HS Installation, Operation, and Maintenance Manual
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Summary of Contents for Goulds Pumps HS
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