Gorman-Rupp Pumps 81 1/2A2-B 253703 and up - Manual (Page 28)

OM−00740 80 SERIES
MAINTENANCE & REPAIR PAGE E − 7
oil and the container must be absolutely clean. If
the oil has been previously used, it must be thor-
oughly filtered.
Heat the bearings to a uniform temperature no
higher than 250
_F (120_C), and slide the bearings
onto the shaft, one at a time, until they are fully
seated. This should be done quickly, in one con-
tinuous motion, to prevent the bearings from cool-
ing and sticking on the shaft.
NOTE
When installing the bearings, be sure to install them
with the integral seals positioned as shown in Fig-
ure 1. The bearings must be positioned with the
seals toward the impeller and drive ends of the
shaft.
Use caution when handling hot bear-
ings to prevent burns.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
out of position in shrinking. If movement has oc-
curred, use a suitably sized sleeve and a press to
reposition the bearings.
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.
Use snap ring pliers to install the inboard bearing
retaining ring (21) in the groove in the pedestal.
Slide the shaft and assembled bearings into the
pedestal until the inboard bearing is fully seated
against the 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 (15) as previously removed. Reinstall the
outboard bearing retaining ring (18) and check
shaft endplay.
NOTE
Shaft endplay should be .002 to .010 inch (0,05 to
0,25 mm). Add or remove bearing adjusting shims
to obtain this endplay.
Install the slinger ring (12) and shaft key (16). Install
any leveling shims used under the pedestal feet.
Secure the pedestal to the base using the pre-
viously removed mounting hardware.
Lubricate the bearing housing as indicated in LU-
BRICATION at the end of this section.
Seal Reassembly and Installation
(Figures 1 and 3)
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