Gorman-Rupp Pumps 83A52-B 1332148 and up - Manual (Page 28)

OM−00881 80 SERIES
MAINTENANCE & REPAIR PAGE E − 7
Replace the bearings, shaft, or pedestal if the
proper bearing fit is not achieved.
If bearing replacement is required, use a bearing
puller to remove the inboard and outboard bear-
ings 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 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 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 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.
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.
Position the oil seal (11) in the pedestal bore with
the lip positioned as shown in Figure 1. Press the
oil seal into the bore until fully seated.
Position the oil seal (19) in the bearing retainer (18)
with the lip positioned as shown in Figure 1. Press
the oil seal into the retainer until fully seated.
Replace the bearing retainer O-ring (23) in the ped-
estal, and lubricate it with grease. Press the bear-
ing retainer into the pedestal until it seats against
the bearing. Be careful not to cut the oil seal lip on
the shaft keyway. Be sure the setscrews (21) in the
bearing retainer are positioned horizontally inline.
Install the same thickness of bearing adjusting
shims (16) as previously removed. Reinstall the re-
taining ring (17) and check shaft endplay.
NOTE
Shaft endplay should be .002 to .005 inch (0,05 to
0,12 mm). Add or remove bearing adjusting shims
to obtain this endplay.