Gorman-Rupp Pumps 81 1/2B52-B 1240557 and up - Manual (Page 26)

OM−01525 80 SERIES
MAINTENANCE & REPAIR PAGE E − 7
be replaced any time the shaft and bear-
ings are removed.
Pre-pack the bearings by hand (or use a bearing
packer if available) with No. 0 lithium base grease
until fully lubricated. Use a suitably sized sleeve
and arbor (or hydraulic) press to press the bear-
ings onto the shaft until fully seated against the
shaft shoulders.
NOTE
When installing the bearings, be sure to install them
with the offset of the bearings in the direction as
shown in Figure 1 (seals toward the outside of the
bearing cavity).
When installing the bearings onto the
shaft, never press or hit against the outer
race, balls, or ball cage. Press only on the
inner race.
If removed, install the inboard bearing retaining
ring (16) in the groove in the pedestal I.D.
Slide the shaft and assembled bearings into the
pedestal until the inboard bearing seats against
the bearing retaining ring.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.
Install the same thickness of bearing adjusting
shims (13) as previously removed, and install the
outboard bearing retaining ring (12).
NOTE
Shaft endplay should be between .002 and .010
inch (.05 to .25 mm). Add or remove bearing adjust-
ing shims to achieve the correct endplay.
Install the slinger ring (7) and shaft key (10). Install
any leveling shims used under the pedestal feet.
Secure the pedestal to the base using the pre-
viously removed mounting hardware.
Lubricate the pedestal as indicated in LUBRICA-
TION at the end of this section.
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 (6), 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. Discard the spring centering washer in-
cluded with the seal. It is not used in this applica-
trion.