Gorman-Rupp Pumps 84A2-4024H 1488564 and up - Manual (Page 30)

OM−06412 80 SERIES
MAINTENANCE & REPAIR PAGE E − 11
in cleaning solvent. Inspect the parts for wear or
damage and replace as necessary.
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.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great-
ly shorten bearing life. Do not spin dry
bearings. This may scratch the rollers or
roller cage and cause premature bearing
failure.
Rotate the bearings by hand to check for rough-
ness or binding and inspect the rollers. If rotation is
rough or the rollers are discolored, replace the
bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the intermedi-
ate. Replace the bearings, shaft, or intermediate if
the proper bearing fit is not achieved.
If bearing replacement is required, use a bearing
puller to remove the inboard and outboard bearing
cones (29 and 32) from the shaft.
Shaft and Bearing Reassembly And Installation
(Figure 3)
Inspect the shaft for distortion, nicks or scratches,
or for thread damage on the impeller end. Dress
small nicks and burrs with a fine file or emery cloth.
Replace the shaft if defective.
Clean and inspect the bearings as indicated in
Shaft and Bearing Removal and Disassembly.
To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected in place. It is
strongly recommended that the bearings
be replaced any time the shaft and and
bearings are removed.
The bearings may be heated to ease installation.
An induction heater, hot oil bath, electric oven, or
hot plate may be used to heat the bearings. Bear-
ings should never be heated with a direct flame or
directly on a hot plate.
NOTE
If a hot oil bath is used to heat the bearings, both the
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.
After the bearing cones have been installed and al-
lowed to cool, check to ensure that they have not
moved away from the shaft shoulders in shrinking.
If movement has occurred, use a suitable sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
If heating the bearings is not practical, use a suit-
able sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
When installing the bearing cones onto the
shaft, never press or hit against the outer
race, rollers, or roller cage. Press only on
the inner race.
Pack the bearing cups and cones with No 0 lithium
base grease.
Press the bearing cup (31) onto the bearing cone
(32) until the cone fully engages the bearing cup.