Goulds Pumps 3409 - IOM - Manual (Page 20)

20
3409 IOM 11/04
bolts tightened. Final alignment check should be made after
the unit has attained its final operating temperature.
Method 1 - Using straight edge and taper gauges or feelers
(Fig. 9):
Proceed with this method only if satisfied that face and
outside diameters of the coupling halves are square and
concentric with the coupling bores. If this condition does
not exist or elastomeric couplings do not make this method
convenient, use Method 2.
Check for angular alignment by inserting the taper or feeler
gauges between the coupling faces at 90° intervals. The
unit is in angular alignment when these four (4)
measurements are the same, or within recommended
tolerances.
Check for parallel alignment by placing a straight edge
across both coupling rims on all four sides. The unit is in
parallel alignment when the straight edge rests evenly
across both coupling rims in all four (4) positions.
Method 2 - Dial Indicators (Fig. 10):
A dial indicator can be used to attain more accurate
alignment.
Fasten the indicator stand or magnetic base to the pump
half of the coupling and adjust the assembly until the
indicator button is resting on the other half coupling
periphery.
Set the dial to zero and chalk mark the coupling half where
the button rests. Also place a separator between the
coupling halves so bearing slack does not affect the
readings. (Chalk and separators are not necessary on the
elastomeric couplings that have not been disconnected.)
Rotate both shafts by the same amount; i.e., all readings
must be made with the button on the chalk mark.
The dial readings will indicate whether the driver has to be
raised, lowered or moved to either side. Accurate alignment
of shaft centers can be obtained with this method even
where faces or outside diameters of the coupling are not
square or concentric with the bores. After each adjustment,
recheck both parallel and angular alignments.
NOTE: Gross deviations in squareness or
concentricity may cause rotation unbalance problems
and if so must be corrected.
PERMISSIBLE COUPLING MISALIGNMENT
Single Element
Coupling
Double Element
(spacer) Coupling
Parallel
.004” TIR
(4 mils)
.060” TIR
per foot of spacer
length
Angular
.004” TIR per inch
of radius.
.002” TIR
per inch of radius
Fig. 9