Gorman-Rupp Pumps 112A20-B 814882 and up - Manual (Page 28)

10 SERIES OM−00701
MAINTENANCE & REPAIR PAGE E − 8
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
away from the shaft shoulders in shrinking. If
movement has occurred, use a suitably sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
If heating the bearings is not practical, use a suit-
ably sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
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.
Press the oil seal (15) into the inboard bearing cap
(30) with the lip positioned as shown in Figure
E−1. Center the seal in the bearing cap. Replace
the bearing cap gasket (29) and secure the bear-
ing cap to the pedestal with the hardware (13 and
14).
Slide the shaft and assembled bearings into the
pedestal until the inboard bearing is fully seated
against the bearing cap. Be careful not to roll or
damage the oil seal lip.
When installing the shaft and bearings into
the pedestal bore, push against the outer
race. Never hit the balls or ball cage.
Press the oil seal (23) into the outboard bearing
cap (20) with the lip positioned as shown in Figure
E−1. Center the seal in the bearing cap. Replace
the bearing cap gasket (19). Install the same thick-
ness of bearing adjusting shims (26) as previously
removed and secure the bearing cap to the pedes-
tal with the hardware (21 and 22). Be careful not to
roll or damage the oil seal lip on the shaft keyway.
NOTE
Shaft endplay should be between .002 and .010
inch (0,05 and 0,25 mm). Add or remove adjusting
shims to establish the correct endplay.
Secure the pedestal to the base with the previously
removed hardware. Install the shaft key (24). Be
sure to reinstall any leveling shims used under the
pedestal mounting feet.
Lubricate the bearings and pedestal as indicated
in LUBRICATION 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. If any components are worn, replace the com-
plete 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 and bellows with water or a very small