Gorman-Rupp Pumps 54J20-B 1410811 and up - Manual (Page 29)

OM-01342 50 SERIES
MAINTENANCE & REPAIR PAGE E - 7
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.
Position the inboard oil seal (34) in the pedestal
bore with the lip positioned as shown in Figure 1.
Press the oil seal into the bore until the face is just
flush with the machined surface on the pedestal.
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.
NOTE
Position the outboard bearing (18) on the shaft as
indicated by the following illustration.
INSTALLATION OF NEW DEPARTURE OR
BCA/FEDERAL MOGAL 5300W SERIES BEARINGS
(OPEN OR ENCLOSED IMPELLERS)
INSTALLATION OF MRC/SKF 5300M OR
FAFNIR 5300W SERIES BEARINGS
(OPEN OR ENCLOSED IMPELLERS)
DIRECTION OF
THRUST
LOADING
BALL LOADING
GROOVE POSITIONED
AWAY FROM IMPELLER
GROOVE
LOADING
BALL LOADING
TOWARD IMPELLER
GROOVE POSITIONED
GROOVE
DIRECTION OF
THRUST
Figure 3. Bearing Installation
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.
Slide the shaft and assembled bearings into the
pedestal bore until the inboard bearing is fully
seated against the pedestal shoulder. Use caution
not to roll or damage the lip of the oil seal (34).
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 bearings shims (19)
as previously removed.