Gorman-Rupp Pumps PA4A60-4024T-ESP 1446296 and up - Manual (Page 49)

OM−06301 PA SERIES
MAINTENANCE & REPAIR PAGE E − 27
housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.
If bearing replacement is required, remove the
snap ring (21) and use a bearing puller to remove
the inboard and outboard bearings from the shaft.
Shaft and Bearing Reassembly and Installation
(Figure 9)
Inspect the shaft (25) 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.
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.
NOTE
Position the outboard bearing (22) on the shaft with
the retaining ring on the bearing O.D. toward the
drive end of the shaft.
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.
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 suitably sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
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.
Secure the outboard bearing to the shaft with the
snap ring (21)
Apply a light coating of oil to the lip of the inboard oil
seal (17A) and press it into the intermediate bore
with the lip positioned as shown in Figure 9. Press
the oil seal into the housing until the face is just
flush with the machined surface on the housing.
It is recommended that a sleeve be positioned
against the inboard oil seal to prevent the lip of the
oil seal from rolling as the shaft and bearings are
installed in the bearing housing. The O.D. of the
sleeve should be just smaller than the bearing
housing bore, while the I.D. of the sleeve should be
just larger than the O.D. of the lip seal area of the
shaft.
With the lip seal sleeve in place, lubricate the lip
seal area of the shaft and slide the shaft and as-
sembled bearings into the intermediate until the re-
taining ring on the outboard bearing seats against
the intermediate. Remove the lip seal sleeve.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.