Pump
Servicing
12.Add a drop of Locktite 222
to the shaft and screw
the impeller on hand tight. The
impeller (#11) will force the
rotating seal half into position.
13.Install bottom plate (#12) and
gasket (#15).
14.To replace the power cord
(#22) on single phase pumps,
as determined on page 2, first
slip the stator lead wires
through the holes in the wire
seal assembly. Coat the cord
grip threads with pipe dope or
apply Teflon tape and screw the
new power cord assembly into
the motor housing. Referring
to wiring diagrams in this
manual, secure wires together.
Do not tape leads together as
the hot oil will deteriorate the
tape and cause motor failure.
15.Before filling the motor housing
with oil, an air test should
be performed. Apply 7 to 8
pounds of air pressure in the
1
⁄
4
" NPT tap on the top of the
motor cover and seal chamber.
Note: Too much pressure will
damage the seal.
Then submerge the pump in
water and check for leaks. If a
leak occurs, isolate where it is
coming from and correct the
problem by replacing the
sealing part. If there are no
leaks, fill the motor and seal
housing with high grade
transformer oil, such as Sohio
Factopure SE40 or equivalent,
to at least one inch below top
of housing.
Do not fill the motor housing
completely — allow air space
for expansion. Replace oil
plug (#6).
3. When installing a replacement
bearing, press only on the
inner face and make sure
the bearing is flush against the
snap ring. If a press is not
available, the bearing can be
tapped onto the shaft using a
sleeve that bears only on the
inner face.
Pressing on the outer face will
ruin the bearing.
4. Push the shaft, rotor and ball
bearing assembly into the seal
plate, being careful not to chip
the ceramic of the stationary
seal half.
5. Replace wavy washer.
6. Replace the stator if it is
visibly burned or if the ground
resistance test or the winding
resistance test has failed.
Note that the replacement
stator must be of the same
manufacture as the existing
rotor, or vice versa. Replace
the stator bolts.
7. Remove the old O-ring (#19),
regardless of condition, and
replace. Place the new O-ring
over the seal plate shoulder.
Do not “roll” it. If twisted,
water may enter chamber and
cause failure.
8. Reattach power wires
and ground.
9. Clean the motor housing
thoroughly, then position it
onto the seal plate.
10.Press the rotating seal half
onto the shaft with the rubber
ring facing the impeller.
Caution: Mixing old and new
seal parts will cause immediate
seal failure. When replacing
seal, replace both the rotating
and the stationary seal halves.
11. Reassemble the lower seal
as described.
Seal:
1. To remove and replace the
mechanical seal (#14), the
bottom plate (#12) and
the impeller (#11) must be
removed first.
2. Remove the rotating carbon
ring and stainless steel spring.
3. Remove the hex head stator
bolts and lift the stator (#3). A
screwdriver can be inserted
under the stator shell in order
to remove the stator.
4. Bump the end of the shaft with
a plastic or rubber hammer.
This will push the rotating half
of the mechanical seal from
the shaft and also push the
lower bearing from the seal
plate. Now remove the shaft,
rotor, and bearing assembly
from the seal plate.
5. Turning the bearing by hand: if
it feels rough when turned or
looks rusted, it should be
replaced. Obtain a bearing
puller to remove the bearing. If
a puller cannot be placed over
the bearing, remove the outer
face by cracking in a vise.
Now the outer face and balls
can be removed, allowing the
inner face to be pulled.
Reassembly:
1. Thoroughly clean the seal (#7)
and bearing pockets in the
volute. All sand and dirt must
be removed.
2. If the stationary seal half was
removed, use a plastic pusher
to press it into the housing.
Make sure the rubber ring
goes in first. Do not use any
sharp objects that may damage
the seal.
6