Gorman-Rupp Pumps 16A20-B 818301 and up - Manual (Page 30)

OM‐00710 10 SERIES
MAINTENANCE & REPAIR PAGE E - 7
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.
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.
Position the inboard bearing on the shaft with the
retaining ring facing toward the impeller 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. 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 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 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.
Slide the shaft and assembled bearings (34 and
39) into the pedestal until the inboard bearing re­
taining ring seats against the pedestal bore.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.
Install the oil seal (35) in the bearing cap (29) with
the lip positioned as shown in Figure E-1. Apply a
thin film of `Loctite Gasket Eliminator' or equivalent
to the face of the bearing cover, and slide the bear­
ing cover and oil seal over the shaft. Be careful not
to damage the oil seal lip. Secure the bearing cover
with the hardware (27 and 28).
Install the O‐ring (40) in the groove in the pedestal
(37). Apply a light coating of soft grease to the O‐
ring.
Press the outboard oil seal (44) into the bearing re­
tainer (47) with the lip positioned as shown in Fig­
ure E-1.
Be sure the lockwashers and machine screws (45
and 46) are fully screwed into the bearing retainer,
and that the machine screws are positioned hori­
zontally in line. Press the bearing retainer into the
pedestal until it seats against the bearing. Be care­
ful not to damage the oil seal lip on the shaft key­
way.
Install the same thickness of bearing adjusting
shims (48) as previously removed. Secure the