Gorman-Rupp Pumps 11 1/2A22-B 1060190 and up - Manual (Page 30)

OM-00574 10 SERIES
MAINTENANCE & REPAIR PAGE E - 7
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 to remove the bearings from the shaft.
Press the inboard oil seal (16) from the pedestal
bore.
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.
Position the inboard oil seal (16) in the pedestal
(19) with the lip positioned as shown in Figure 1.
Press the oil seal into the pedestal until the face is
just flush with the machined surface in the hous­
ing.
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 against the shaft shoulders. This should be
done quickly, in one continuous motion, to prevent
the bearings from cooling 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
out of position in shrinking. If movement has oc­
curred, use a suitably sized sleeve and a press to
reposition the bearings.
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.
After installation, pack the bearings by hand with
No. 0 lithium base grease until fully lubricated.
Slide the shaft and assembled bearings into the
pedestal until the inboard bearing seats against
the pedestal bore. Be careful not to damage the oil
seal lip.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.
Press the outboard oil seal (28) into the bearing
cap (25) with the lip positioned as shown in Figure
1. Install the same thickness of bearing adjusting
shim (21) as previously removed, Secure the bear­