2
1
1.
Straight edge
2.
Feeler gauge
Figure 11: Correct alignment
4.3.3 Align the pump using a dial indicator
Before you begin, you must have a dial indicator with a mounting magnet and extension bars.
A dial indicator can provide more accurate alignment than a straight edge.
1.
Fasten the indicator stand or magnetic base to the pump half of the coupling.
2.
Adjust the assembly until the indicator button is resting on the periphery of the other coupling half.
3.
Set the dial to zero and use chalk to mark the coupling half where the button rests. Then place a
separator between the coupling halves so that the bearing slack does not affect the readings.
Chalk and separators are not necessary on the elastomeric couplings that have not been discon-
nected.
4.
Rotate both shafts by the same amount.
All readings must be made with the button on the chalk mark.
The dial readings will indicate whether the driver must be raised, lowered, or moved to either side.
You can accurately align the shaft centers with this method even where faces or outside diameters
of the coupling are not square or concentric with the bores.
NOTICE:
Risk for rotation unbalance. Any gross deviation in squareness or concentricity must be cor-
rected.
5.
After each adjustment, recheck both parallel and angular alignments.
1
2
3
1.
Dial indicator
2.
Reference mark
3.
Separator to take up the bearing slack
Figure 12: Angular alignment
4.3 Pump-to-driver alignment
24
Model 3409 Installation, Operation, and Maintenance Manual
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