Gorman-Rupp Pumps 13A22-B 1063371 and up - Manual (Page 30)

OM-00633 10 SERIES
MAINTENANCE & REPAIR PAGE E - 7
Bearings must be kept free of all dirt and
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 pedestal.
Replace the bearings, shaft, or pedestal if the
proper bearing fit is not achieved.
If bearing replacement is required, use a bearing
puller or an arbor (or hydraulic) press to remove
the bearings from the shaft.
Press the inboard oil seal (19) from the pedestal
bore.
Shaft and Bearing Reassembly and Installa­
tion
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.
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.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
away from the shaft shoulders in shrinking. If
movement has occurred, use a suitable sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
If heating the bearings is not practical, use a suit­
able sized sleeve and arbor (or hydraulic) press to
position the bearings on the shaft until fully seated
against the shaft shoulders.
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 oil seal (19) in the pedestal
(22) with the lip positioned as shown in Figure
E-1. Press the oil seal into the pedestal until the
face is just flush with the machined surface in the
housing.
Slide the shaft (30) and assembled bearings (20
and 24) into the pedestal until the inboard bearing