Gorman-Rupp Pumps PA12A60-B-6068H 1435345 and up - Manual (Page 44)

PA SERIES OM-06296
MAINTENANCE & REPAIR PAGE E - 24
If the complete coupling assembly is being re­
placed, apply `Loctite Retaining Compound No.
242' or equivalent compound to the threads of the
hardware (7and 9), and secure the outer ring of the
coupling to the engine flywheel by torquing the
hardware to 45 ft. lbs. (540 in. lbs. or 6,2 m. kg.).
Position the drive assembly so the flexible portion
of the coupling seats inside the drive ring attached
to the engine flywheel. Secure the bearing housing
(6) to the engine bellhousing with the previously re­
moved hardware.
NOTE
To ease installation, lightly lubricate the rubber por­
tion of the coupling with a non‐petroleum based
lubricant such as vegetable oil or glycerin, or a sili­
con‐based lubricant such as “WD40” or equivalent.
Do not use petroleum‐based lubricants, or any oth­
er substance which may soften or otherwise dam­
age the rubber.
Pump Shaft and Bearing Reassembly and
Installation
(Figure 6)
Inspect the impeller shaft (32) for distortion, nicks
or scratches, or damaged keyways. Dress small
nicks and burrs with a fine file or emery cloth. Re­
place the shaft if defective.
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.
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.
Use caution when handling hot bearings to
prevent burns.
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). Position the roller
bearing (34) on the shaft with the internal snap ring
positioned away from the impeller end of the shaft.
Slide the roller bearing onto the shaft until fully
seated against the shaft shoulder. This should be
done quickly, in one continuous motion, to prevent
the bearings from cooling and sticking on the shaft.
After the bearing has been installed and allowed to
cool, check to ensure that it has not moved away
from the shaft shoulder in shrinking. If movement
has occurred, use a suitably sized sleeve and a
press to reposition the bearing against the shaft
shoulder.
Secure the roller bearing on the shaft with the bear­
ing retaining ring (55).
Slide the heated outboard bearings (30) onto the
shaft, one at a time, with the larger inner races of
each bearing positioned away from each other as
shown in Figure 6.
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 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