Gorman-Rupp Pumps 112B60-B 758209 and up - Manual (Page 29)

OM-01828 10 SERIES
MAINTENANCE & REPAIR PAGE E - 9
centering washer (26), and impeller onto the shaft.
A clearance of .015 inch (0,38 mm) is required be­
tween the impeller and seal plate to achieve maxi­
mum pump efficiency. Adjust the back clearance
by adding bearing housing shims (41) until the im­
peller scrapes against the seal plate when the shaft
is turned. After the impeller scrapes, subtract .015
inch (0,38 mm) of bearing housing shims. Disas­
semble the impeller, washer, sleeve and seal plate
and proceed with Seal Reassembly.
Seal Reassembly and Installation
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.
Inspect the impeller shaft for damage. Small
scratches or nicks may be removed with a fine file
or emery cloth. If excessive wear exists, the shaft
will have to be replaced.
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 (28), or re­
place it if there are nicks or cuts on either end. If any
components 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, bellows and shaft sleeve 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 E-3).