Gorman-Rupp Pumps 88B2-F5L 1323330 and up - Manual (Page 31)

OM−02301 80 SERIES
MAINTENANCE & REPAIR PAGE E − 11
ly shorten bearing life. Do not spin dry
bearings. This may scratch the rollers or
races, and cause premature bearing fail-
ure.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the bearing
housing. Replace the bearing cups or cones, the
shaft, or intermediate if the proper bearing fit is not
achieved.
Pre-pack the bearings by hand (or use a bearing
packer if available) with No. 0 lithium base grease
until the bearing rollers are thoroughly lubricated.
Position the inboard and outboard bearing cones
(28 and 31) on the impeller shaft with the high side
of the tapered roller bearings toward the lubrica-
tion cavity. Press the cones onto the shaft until
seated squarely against the shaft shoulders.
When installing the bearings onto the
shaft, never press or hit against the rollers
or roll cage. Press only on the inner race.
Press the bearing closure (32) and inboard bearing
cup (30) into the intermediate until seated squarely
against the intermediate shoulder.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the rollers or roll cage.
Slide the shaft and assembled bearing cones into
the intermediate bore until the inboard bearing
cone (31) fully engages the inboard bearing cup.
Press the outboard bearing cup (27) over the out-
board bearing cone (28).
Install the same thickness of bearing adjusting
shims (21) as previously remove, and secure them
with the bearing cap (26) and hardware (24 and
25). Check the shaft endplay.
NOTE
Shaft endplay should be between .003 and .005
inch (0,08 to 0,13mm). Add or remove bearing
shims to establish the correct endplay.
Lubricate the bearings as indicated in LUBRICA-
TION at the end of this section.
Seal Reassembly and Installation
(Figures 2 and 4)
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 seal spacer sleeve, 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 pack-
ing rings and seal liner with water or a very small
amount of oil, and apply a drop of light lubricating
oil on the finished faces. Assemble the seal as fol-
lows, (see Figure 5).