Gorman-Rupp Pumps 16C20-F4L 1317844 and up - Manual (Page 34)

10 SERIES OM-01604
MAINTENANCE & REPAIR PAGE E - 12
Make certain that the flexible portion of the
coupling is mounted to the dimension
shown in Figure 3. This dimension is crit­
ical. If the coupling is not properly posi­
tioned on the shaft, the coupling parts may
not fully engage, or a pre‐load condition
can cause premature bearing failure.
The end of the bushing must be just flush
from the end of the shaft. This will allow the
two portions of the coupling to fully engage
when the intermediate is secured to the en­
gine bellhousing, without pre‐loading the
bearings.
With the flexible portion of the coupling and the
bushing properly positioned on the shaft, tighten
the two setscrews in an alternating sequence until
the bushing and coupling are fully secured. Torque
the setscrews to 14.5 ft. lbs. (175 in. lbs. or 2,02 m.
kg.).
If the complete coupling assembly is being re­
placed, apply `Loctite Retaining Compound No.
242' or equivalent compound to the threads of the
hardware (4 and 5), and secure the outer ring of the
coupling to the engine flywheel by torquing the
hardware to 45 ft. lbs. (540 in. lbs. or 6,2 m. kg.).
Using a suitable lifting device, position the as­
sembled coupling, intermediate, shaft and bear­
ings so the flexible portion of the coupling seats in­
side the outer ring attached to the engine flywheel.
NOTE
To ease installation, lightly lubricate the rubber por­
tion of the coupling with a non‐petroleum based
lubricant such as vegetable oil or glycerin, or a sili­
con‐based lubricant such as “WD40” or equivalent.
Do not use petroleum‐based lubricants, or any oth­
er substance which may soften or otherwise dam­
age the rubber.
Install the intermediate guards (40 and 41, Figure
2), and secure the intermediate to the engine bell­
housing with the previously removed hardware (6
and 7).
Seal Reassembly and Installation
(Figures 2 and 5)
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven­
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain­
ers.
The seal is not normally reused because wear pat­
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer­
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non‐oil based solvent and a clean, lint‐free tissue.
Wipe lightly in a concentric pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak­
age. Clean and polish the shaft sleeve, or replace it
if there are nicks or cuts on either end. If any com­
ponents are worn, replace the complete seal;
never mix old and new seal parts.
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.
To ease installation of the seal, lubricate the O‐
rings, sleeve, and bellows with water or a very
small amount of oil, and apply a drop of light lubri­
cating oil on the finished faces. Assemble the seal
as follows, (see Figure 5).