Gorman-Rupp Pumps S8B1-E100 460/3 1432260 and up - Manual (Page 40)

S SERIES PUMPS OM-06259
MAINTENANCE AND REPAIR PAGE E - 14
Intermediate And Motor Housing Disassembly
(Figure E-1)
See PUMP END DISASSEMBLY, and remove all
pump end and seal components.
With the pump end disassembled and the motor
cavity drained of oil, secure the pump in an in­
verted position. Remove the hardware (45 and 46)
securing the intermediate (48) to the motor hous­
ing (18). Do not remove the hardware (12 and 13)
around the rotor shaft at this time.
Hook a three‐leg‐sling in the intermediate flange
holes and hoist the intermediate, rotor and shaft
(39), bearing cap (17) and both ball bearings (31
and 47) from the motor housing as an assembly. If
necessary, tap around the parting surfaces with a
soft‐faced mallet to loosen the seal between the in­
termediate and motor housing. Remove the motor
housing gaskets (15, 16 and 43).
Cover the motor housing with a clean, lint free cloth
to avoid contamination by dirt or other foreign ma­
terial.
Rotor And Bearing Removal
(Figure E-1)
Set the intermediate and rotor assembly on a clean
work surface. Leave the lifting slings attached and
reduce the tension slightly. Remove the hardware
(12 and 13) securing the bearing cap to the inter­
mediate. Steady the rotor and separate the inter­
mediate. If necessary, tap the impeller end of the
rotor shaft with a soft‐faced mallet to loosen the
seal between the lower ball bearing (47) and the in­
termediate bore.
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 rotor
assembly is removed.
Before removing the bearings from the rotor shaft,
clean and inspect the bearings in place as follows.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
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.
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 discolored, re­
place the bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the motor
housing and intermediate bore. Replace the shaft
and rotor (as an assembly), the motor housing or
intermediate if the proper bearing fit is not
achieved.
The lower bearing (47) is secured to the shaft by a
tight press fit. Install two 3/8-16 UNC x 6-inch
long capscrews (not supplied) 180
_ apart in the
tapped holes in the bearing cap (17). Use a bear­
ing puller in conjunction with the capscrews to re­
move the lower bearing and bearing cap as an as­
sembly.
Separate the bearing cap and gasket (14) from the
lower ball bearing.
If replacement is required, use a bearing puller to
remove the upper ball bearing from the rotor shaft.
Stator Removal
(Figure E-1)
Do not remove the stator (40) unless it is defective
(open windings, insulation resistance low, or stator
core damaged). If the stator must be removed, re­
move the terminal housing as indicated in Termi­
nal Housing And Power Cable Disassembly.
Position an expandable tool, such as a split disc,
approximately 2 inches (51 mm) inside the stator,
and expand it tightly and squarely on the I.D. At­
tach a lifting device to the lifting eye of the tool, and
raise the assembly approximately 1 inch (25 mm)
off the work surface.