Gorman-Rupp Pumps 81 1/2E52-B 1271304 and up - Manual (Page 24)

80 SERIES OM−00791
MAINTENANCE & REPAIR PAGE E − 6
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 bear-
ings are removed.
Clean the bearing housing, shaft and all compo-
nent parts (except the bearings) with a soft cloth
soaked 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.
Inspect the shaft for distortion, nicks or scratches
or thread damage on the impeller end. Dress small
nicks and burrs with a fine file or emery cloth. Re-
place the shaft if defective.
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.
Rotate the bearings by hand to check for rough-
ness or binding. If rotation is rough, replace the
bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the bearing
housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.
If bearing replacement is required, use a bearing
puller or an arbor (or hydraulic) press to remove
the bearings from the impeller shaft.
Shaft And Bearing Reassembly And
Installation
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 (13 and 13A) may be heated to ease
installation. An induction heater, 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.
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.
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.