© Edwards Limited 2008. All rights reserved. Page 31
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Installation
S900-01-880 Issue C
3. Position the hubs on the shafts so that there is a gap of approximately 25.4 mm (1.0 inch) between the hub
recesses for the polymer spider, and so that there is an equal amount of support for both coupling halves. When
one of the half-couplings is in its final position, tighten the set screw (½-13) on the half-coupling to a torque of
61 to 68 N m (45 to 50 lbf ft).
4. Slide back the free half-coupling and install the polymer spider. Reposition the free half-coupling to the correct
spacing, and tighten the set screw as described above.
5. If you cannot slide back the hub: torque the second half-coupling at the correct spacing; separate the
components and install the polymer spider; reassemble the coupling hubs together with the correct spacing.
6. Check for parallel alignment with a straight edge across the two coupling halves at several places around the
coupling. Do not rotate the coupling. Measure the space under the straight edge. The misalignment
measurement must be less than 0.013 mm (0.005 inch). Correct alignment will ensure the best performance and
longest coupling life. Reposition the shafts if the maximum misalignment is exceeded.
7. Determine the angular alignment across the coupling. Take the measurements fromthe surface where the
couplings neck down from the spider diameter to the diameter with the set screw(s). Determine the maximum
and minimum values. The difference between these two measurements must be less than 0.38 mm (0.015 inch).
Reposition the shafts if the maximum tolerance is exceeded. Recheck for parallel alignment if you reposition the
coupling.
8. Rotate the coupling after you have set the proper alignment. The shaft should rotate freely and easily. Never
operate a coupling above the maximum permissible power of the r min-1 (r.p.m.) rotation speed indicated
(stamped) on the coupling. Never operate the booster pump at speeds above 3600 r min-1 (r.p.m.).
9. Install proper safety guards before you operate the booster pump.
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