Gorman-Rupp Pumps PA12A60-B-6068H 1435345 and up - Manual (Page 43)

OM-06296 PA SERIES
MAINTENANCE & REPAIR PAGE E - 23
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.
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 bearings to
prevent burns.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
in shrinking. If movement has occurred, use a suit­
ably 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.
Slide the shaft and assembled bearings into the
bearing housing until the outboard bearing is fully
seated against the bearing housing shoulder.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.
Secure the shaft and bearings in the bearing hous­
ing with the bearing retaining ring (1).
Install the key (5) in the output shaft keyway. Posi­
tion the flexible portion of the coupling assembly
(3) on the shaft as shown in Figure 9.
NOTE
The flexible portion of the coupling must be proper­
ly positioned on the shaft. The heads of the caps­
crews in the center of the coupling must be posi­
tioned toward the drive end of the shaft.
Align the keyway in the bushing (10) with the shaft
key, and slide the bushing onto the shaft. Rotate
the flexible portion of the coupling until the tapped
holes for the two setscrews align with those in the
bushing and install the setscrews. Position the
coupling to the dimension shown in Figure 9.
Make certain that the flexible portion of the
coupling is mounted as shown in Figure 9.
The end of the shaft must protrude 1.06 to
1.19 inches (26,9 to 30,2 mm) from the face
of the bushing. This dimension is critical.
If the coupling is not properly positioned
on the shaft, the coupling parts may not ful­
ly engage, or a pre‐load condition can
cause premature bearing failure.
With the flexible portion of the coupling and the
bushing properly positioned on the shaft, tighten
the two setscrews in an alternating sequence until
the bushing and coupling are fully secured. Torque
the setscrews to 23 ft. lbs. (280 in. lbs. or 3,2 m. kg.)
maximum.
Position the key (13) in the shaft keyway. Position
the drive sprocket over the shaft. Align the keyway
in the taperlock bushing (15) with the shaft key and
slide the bushing onto the shaft. Align the holes in
the bushing with those in the sprocket, and install
the bushing capscrews.
Position the sprocket on the shaft to the dimension
shown in Figure 9 and tighten the bushing caps­
crews in an alternating sequence until the bushing
and coupling are fully secured. Torque the set­
screws to 60 ft. lbs. (720 in. lbs. or 8.3 m. kg.).