Gorman-Rupp Pumps PAH8A60C-B 1537579 and up - Manual (Page 36)

PAH SERIES OM-06455
MAINTENANCE & REPAIR PAGE E - 14
Separating Rotating Assembly From Power
Source
(Figure 1)
Further disassembly requires separating the rotat­
ing assembly from the power source. Remove the
coupling securing the rotating assembly to the
power source. Remove the belt (20).
Remove any hardware securing the pedestal (18,
Figure 3) to the base. Use a suitable hoist and sling
to move the rotating assembly to a clean, well‐
equipped workshop for further disassembly.
Remove the capscrews from the center of the
bushing (19). Reinstall the capscrews in the
tapped holes in the bushing and tighten them in an
alternating pattern until the bushing is “jacked” out
of the sheave (18). Slide the bushing and sheave
off the shaft. Remove the key (28, Figure 3).
Shaft and Bearing Removal and Disassembly
(Figure 3)
When the pump is properly operated and main­
tained, the bearing housing should not require dis­
assembly. Disassemble the shaft and bearings
only when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
Remove the bearing housing drain plug (19A) and
drain the lubricant. Clean and reinstall the drain
plug.
Disengage the hardware (15 and 16) and remove
the mounting flange (21), gasket (17) and oil seal
(20). Use a suitably sized dowel to press the oil seal
from the mounting flange.
Place a block of wood against the impeller end of
the shaft (25) and tap the shaft and assembled
bearings (24 and 27) from the bearing housing.
Press the oil seal (20) from the bearing housing.
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.
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.
Clean the bearing housing, shaft and all compo­
nent parts (except the bearings) with a soft cloth
soaked in cleaning solvent. Inspect the parts for
wear or damage and replace as necessary.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven­
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain­
ers.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great­
ly shorten bearing life. Do not spin dry
bearings. This may scratch the balls or
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 bearing
housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.
If bearing replacement is required, straighten the
tab on the bearing lock washer (23). Use a spanner