Gorman-Rupp Pumps PAH3A60C-B 1524589 and up - Manual (Page 36)

OM-06472 PAH SERIES
MAINTENANCE & REPAIR PAGE E - 15
NOTE
Position the outboard bearing (24) on the shaft with
the retaining ring on the bearing O.D. toward the
drive end of the shaft. The inboard bearing (27) is
equipped with a flange ring that is shipped loose
with the bearing. Install the flange ring on the shaft
prior to heating and installing the bearings.
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.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
during cooling. 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 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, rollers or cage. Press only on
the inner race.
It is recommended that a new bearing lock
washer (23) be installed any time the shaft
and bearings are disassembled. Re‐use of
an old lock washer may create a pre‐load
condition on the bearing, resulting in pre­
mature bearing failure.
Install the bearing lockwasher (23) and screw the
bearing locknut (22) onto the shaft until tight.
Torque the bearing lock nut to (150 ft. lbs. (20,8 m.
kg.). After torquing, locate the tab on the lock
washer that aligns with a slot in the lock nut and
bend the tab over into the slot.
Apply a light coating of oil to the lip of the inboard oil
seal (13) and press it into the pedestal bore with the
lip positioned as shown in Figure 3. Press the oil
seal into the pedestal until the face is just flush
with the machined surface on the pedestal.
It is recommended that a sleeve be positioned
against the inboard oil seal to prevent the lip of the
oil seal from rolling as the shaft and bearings are
installed in the pedestal. The O.D. of the sleeve
should be just smaller than the pedestal bore,
while the I.D. of the sleeve should be just larger
than the O.D. of the oil seal area of the shaft.
With the oil seal sleeve in place, lubricate the oil
seal area of the shaft and slide the shaft and as­
sembled bearings into the pedestal until the retain­
ing ring on the outboard bearing seats against the
pedestal. Remove the oil seal sleeve.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls, rollers or cages.
Apply a light coating of oil to the lip of the outboard
oil seal (13A) and press it into the pedestal with the
lip positioned as shown in Figure 3. The face of the
oil seal should be just flush with the outer face of
the pedestal.
Apply a light coating of oil to the lip of the oil seal
(19) and press it into the drive flange (20) with the
lip positioned as shown in Figure 3. The oil seal
should be centered in the flange bore.
Install the gasket (21) and slide the assembled
drive flange and oil seal over the impeller shaft. Use
caution not to cut or roll the lip of the oil seal (19) on
the shaft keyway. Secure the drive flange to the
pedestal with the hardware (16A and 17A). Torque
the capscrews (17A) to 41 ft. lbs. (5,7 m. kg.).
Lubricate the bearings as indicated in LUBRICA­
TION at the end of this section.
Securing Rotating Assembly to Power Source
(Figure 1)
Install the key (34) in the shaft keyway, making sure
to leave room in the keyway for the drive key (28,