S SERIES PUMPS
OM-07089
MAINTENANCE AND REPAIR
PAGE E - 18
Use a suitable lifting device to hoist the intermedi
ate, rotor and shaft assembly (40) and ball bear
ings (41 and 46) from the motor housing as an as
sembly. If necessary, use a soft‐faced mallet to
break the seal between the intermediate and the
motor housing. Remove the motor housing O‐
rings (54 and 55).
Cover the motor housing with a clean, lint‐free
cloth to avoid contamination by dirt or other foreign
material.
Lightly rest the inboard bearing end of the rotor on
a clean work surface. Leave the lifting slings at
tached, reducing tension slightly.
Remove the hardware (48 and 49) securing the
bearing cap to the intermediate. Steady the rotor
and shaft assembly, and separate the intermedi
ate. If necessary, tap the impeller end of the shaft
with a soft‐faced mallet to loosen the seal between
the lower ball bearing (46) and the intermediate
bore.
Remove the bearing cap gasket (45).
Disconnect the probe wire (38) at the tab (37), and
unscrew the moisture detector (36) from the inter
mediate.
Bearing Removal
(Figure E-2)
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 bearing bore. Replace the shaft and
rotor (as an assembly), the motor housing or inter
mediate if the proper bearing fit is not achieved.
If replacement is required, use a bearing puller to
remove the upper and lower ball bearings (41 and
46) from the rotor shaft. Use the bearing cap (44)
and capscrews (48), in conjunction with a bearing
puller, to remove the lower bearing from the shaft.
Remove the lower bearing from the bearing cap.
Press the oil seal (43) from the bearing cap.
Stator Removal
(Figure E-2)
Do not remove the stator (53) 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.
The motor housing (70) must be heated with a
torch to expand them enough for the stator to be
removed. Apply heat evenly to the outside of the
motor housing; excessive heat is not required.
When the motor housing is sufficiently heated, use
a soft‐faced mallet to rap alternate edges of the
