Gorman-Rupp Pumps 03B31-B 594101 and up - Manual (Page 26)

0 SERIES OM-01182
MAINTENANCE & REPAIR PAGE E - 6
Replace the bearings, shaft, or pedestal if the
proper bearing fit is not achieved.
If bearing replacement is required, use a suitable
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 the bear­
ings be cleaned and inspected in place. It
is strongly recommended that the bear­
ings be replaced any time the shaft and
bearings are removed.
Inspect the shaft for distortion, nicks or scratches
or damage. Dress small nicks and burrs with a fine
file or emery cloth. Replace the shaft if defective.
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.
NOTE
When installing the bearings (18 and 20), position
the bearings on the shaft with the integral bearing
seals facing away from each other.
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 shaft shoulders. 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.
If heating the bearings is not practical, use a suit­
ably sized sleeve and an arbor (or hydraulic) press
to install the bearings onto 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.
After the bearings are installed on the shaft, pack
the bearings by hand with No. 0 lithium base
grease until fully lubricated.
Slide the shaft and assembled bearings into the
pedestal until the inboard bearing is fully seated
against the bore shoulder.
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 (17) as previously removed. Install the bear­
ing cap (17) and secure it with the hardware (13
and 14). Check the shaft endplay.
NOTE
Shaft endplay should be .002 to .010 inch (0,05 mm
to 0,25 mm). Add or remove bearing adjusting
shims to obtain this endplay.
Install the shaft key (12).