6
carbon ring to be removed. There
is a rubber sleeve (bellows) inside
the spring which grips the pump
shaft. This often restricts the
spring and must be pried or
pulled loose.
With the carbon ring, spring, and
rubber sleeve removed, wedge the
ceramic seat out of the housing.
Be sure not to scratch or mar the
pump shaft.
Upper Seal
1. To remove and replace the
upper mechanical seal (#5),
the base (#12), impeller (#11),
lower mechanical seal (#14),
and volute (#7) must be
removed first. Drain the seal
oil from the housing by
removing pipe plug (#8).
2. The rotating carbon ring and
stainless steel spring are held
in place by a snap ring (#27)
and washer (#10). Remove these.
3. Remove the four 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 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. If water was found in the oil,
the rotating and stationary
halves of the mechanical seal
must be replaced. Remove
the stationary seal half by
inserting a screwdriver into
seal plate from the top and
tapping lightly with a hammer.
Do not roll it. If twisted,
water may enter chamber and
cause failure.
7. Clean the motor housing
thoroughly, then position it
onto the seal plate.
8. 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.
9. Reassemble the lower seal
as described.
10.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.
11. Set the seal housing (#20) and
motor housing (#2) assembly
into the volute case (#7) and
secure with four hex head
screws (#4).
12.To replace the power cord
(#22) on single phase pumps,
as determined on page 5, 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.
13.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.
6. 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 replaced
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
plate (#20), particularly the
seal and bearing pockets. 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.
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 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 four stator bolts.
6. Remove the old O-ring (#19),
regardless of condition, and
replace. Place the new O-ring
over the seal plate shoulder.
Pump
Servicing
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