Gorman-Rupp Pumps VG5C3-B 1188885 and up - Manual (Page 27)

OM-02816 VG SERIES
MAINTENANCE & REPAIR PAGE E - 6
foreign material. Failure to do so will great­
ly shorten bearing life. Do not spin dry
bearings. This may scratch the balls or
races and cause premature bearing fail­
ure.
Rotate the bearings by hand to check for rough­
ness or binding and inspect the bearing balls. If ro­
tation is rough or the bearing balls are discolored,
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.
Use a bearing puller to remove the inboard and
outboard bearings from the shaft. Remove the
bearing spacers (21 and 36).
It is not necessary to remove the bearing snap
rings (22 and 37) from the shaft unless replace­
ment is required. If replacement is required, use
snap ring pliers to remove the snap rings from the
impeller shaft.
Shaft And Bearing Reassembly
And Installation
If removed, reinstall the bearing snap rings (22 and
37) in the grooves in the shaft. Replace the bearing
spacers (21 and 36).
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 bear­
ings 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 against the bearing spacers. This should
be done quickly, in one continuous motion, to pre­
vent 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 suitable sized sleeve and a press to
reposition the bearings.
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 bearings onto the
shaft, never press or hit against the outer
race, balls, or ball cage. Press only on the
inner race.
Install the oil seal (28) in the outboard bearing
cover (30). Install the gasket (27), and secure the
bearing cover to the bearing housing (20) with the
capscrews (29).
Slide the shaft and assembled bearings into the
bearing housing
until the outboard bearing seats
against the bearing cover. Be careful not to dam­
age the lip of the oil seal (28) on the shaft keyway.
When installing the shaft and bearings into