Gorman-Rupp Pumps 16A22-B 1068713 and up - Manual (Page 27)

OM−00711−04 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.
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 suitable sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
If heating the bearings is not practical, use a suit-
able sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft until fully seated
against the shaft shoulders. Position the inboard
bearing on the shaft with the retaining ring facing
toward the impeller end of 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 until the inboard bearing 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 (36) in the bearing cap (38) with
the lip positioned as shown in Figure 1. Install the
bearing cap O-ring (37) in the bearing cap. Slide
the assembled bearing cap over the shaft and se-
cure it to the pedestal (23) with the hardware (40
and 41). Be careful not to damage the oil seal lip.
Apply a light coating of soft grease on the bearing
retainer O-ring (26) and the O-ring groove. Install
the O-ring in the pedestal. Install the same thick-
ness of bearing adjusting shim (25) as previously
removed.
Press the outboard oil seal (28) in the bearing re-
tainer (32) with the lip positioned as shown in Fig-
ure E−1. Press the bearing retainer into the pedes-
tal until it seats against the bearing. Be careful not
to damage the oil seal lip on the shaft keyway. Be
sure the machine screws and lockwashers (30 and
31) are fully screwed into the bearing retainer and
are positioned horizontally in line.
Using snap ring pliers, secure the bearing retainer
with the bearing retaining ring (27). Check the 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.