Gorman-Rupp Pumps 14A20-B 740693 and up - Manual (Page 30)

OM-00660 10 SERIES
MAINTENANCE & REPAIR PAGE E - 7
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 (13 and
23) 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 (25) in the bearing cap (12) with
the lip positioned as shown in Figure 1. Apply a
thin film of `Loctite Plastic Gasket' or equivalent to
the face of the bearing cap and slide the bearing
cap and oil seal over the shaft. Be careful not to
damage the oil seal lip. Secure the bearing cap
with the hardware (27 and 28).
Replace the bearing retainer O‐ring (69) in the ped­
estal and lubricate it with grease. Press the bearing
retainer into the pedestal until it seats against the
bearing. Be careful not to cut the oil seal lip on the
shaft keyway. Be sure the setscrews (78) in the
bearing retainer are positioned horizontally inline.
Install the same thickness of bearing adjusting
shims (21) as previously removed. Reinstall the re­
taining ring (20) and check shaft endplay.
NOTE
Shaft endplay should be between .002 and .010
inch (.05 to .25 mm). Add or remove bearing adjust­
ing shims to achieve the correct endplay.
Lubricate the pedestal as indicated in LUBRICA­
TION at the end of this section.
Seal Reassembly and Installation
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.