Gorman-Rupp Pumps VGH4C31-B 1379872 thru 1210169 - Manual (Page 28)

VGH SERIES OM−06126
MAINTENANCE & REPAIR PAGE E − 6
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.
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 greatly
shorten bearing life. Do not spin dry bear-
ings. This may scratch the balls or races
and cause premature bearing failure.
Rotate the bearings by hand to check for rough-
ness or binding and inspect the bearing rollers and
balls. If rotation is rough or the bearing rollers or
balls are discolored, replace the bearings.
Replace the bearings, shaft, or bearing housing as
required if the proper bearing fit is not achieved.
Shaft and Bearing Reassembly And Installation
Clean and inspect the bearings as indicated in
Shaft and Bearing Removal and Disassembly.
It is strongly recommended that the bear-
ings be replaced any time the shaft and
and bearings are removed.
The outboard bearing (19) and the inner race of the
inboard bearing (31) may be heated to ease instal-
lation. An induction heater, hot oil bath, electric
oven, or hot plate may be used to heat the bearing.
Bearings 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 bearing, both the
oil and the container must be absolutely clean. If
the oil has been previously used, it must be thor-
oughly filtered.
Install the inboard bearing spacer (21).
Heat the outboard bearing and inner race of the in-
borad bearing (31) to a uniform temperature no
higher than 250
_F (120_C), and slide the bearings
it onto the shaft, one at a time, until fully seated.
This should be done quickly, in one continuous
motion, to prevent the bearings from cooling 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.
When installing the bearings onto the
shaft, never press or hit against the outer
race, rollers, balls, or ball cage. Press only
on the inner race.
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.
Install the outboard bearing spacer (21). Installthe
snap ring (24) in the groove in the impeller shaft.
Position the bearing housing on a secure work sur-
face with the drive end facing up. Slide the shaft
into the bearing housing
until the bearing (19)
seats against the bearing bore shoulder.