Gorman-Rupp Pumps 112G60-B 1214462 and up - Manual (Page 30)

OM−05174 10 SERIES
MAINTENANCE & REPAIR PAGE E − 7
lockwasher. Use a bearing puller to remove the
bearings (30 and 32) from the shaft.
NOTE
The outboard bearings (32) are a matched set and
cannot be replaced separately.
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 bear-
ings are removed.
Be sure the oil return groove on the inside bottom
of the bearing housing is clean and free of dirt.
Inspect the shaft for distortion, nicks or scratches,
or for thread damage on the impeller end. 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.
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.
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.
Position the inboard bearing (51) on the shaft so
that the large shoulder of the outer race faces to-
ward the impeller. Slide the bearing onto the shaft
until fully seated against the shaft shoulder.
Press the heated outboard bearings on the impel-
ler shaft, making certain that they are installed with
the loading opening sides facing each other and
the ball contact angles converging toward the cen-
ter (see Figure E−2). Also make certain that the in-
ner bearing is seated squarely against the shaft
shoulder.
Figure E−2. Correct Bearing Mounting
While the bearings are still hot, promptly install the
bearing lockwasher and locknut (53 and 54). Tight-
en the locknut and bend the tabs of the lockwasher
over the locknut.
Make certain that there are no burrs or dirt on the
interior surfaces of the bearing housing (33). Heat
the bearing housing and slide the shaft and bear-
ings into the heated bearing housing. Make certain
that the bearings are pressed squarely against the
step of the housing.
When installing the shaft and bearings into