4
Pump
Servicing
plug. The ohmmeter should be
on R X 1 setting. Normal
readings are 1.4 to 1.54 ohms
for 115V, 4.5 to 4.9 for 230V.
To check the ground, place the
ohmmeter on R X 100k,
connect one lead clip to the
“ground” prong on the power
cord and touch the other lead
clip to each “flat” prong
individually. If the reading is
other than infinity (
∞
on the
ohmmeter scale), a leakage
through stator insulation or
moisture in the windings is
occurring and the stator must
be removed, dried out and
rechecked. A reading at zero
indicates a dead short and the
stator will have to be replaced.
6. To check to see if water has
entered the motor cap, remove
the pipe plug (14) at the top of
the pump and drain the oil into
a bucket. A milky appearance
to the oil indicates that
water has entered through
either worn or damaged seals
or O-rings and replacement
is necessary.
7. Remove the four hex-head
screws (7) from the motor
housing and lift off the motor
housing (4) very carefully as a
grounding wire is attached to
the inside of the motor housing
(4). Remove the ground screw
(13) and set the motor housing
(4) aside.
8. To remove impeller, hold the
rotor shaft assembly with
screwdriver (screwdriver slot
in shaft). Carefully tap impeller
off shaft with a plastic or
rubber hammer. Tap impeller
(11) counterclockwise to
remove. Loctite #277 is
applied to shaft at assembly, so
to remove impeller it will be
necessary to break this seal.
This is why the plastic or
rubber hammer is used to
avoid damage to the impeller.
9. Insert a screwdriver under the
edge of the ceramic seal (6)
and lift it off.
10.Remove the stationary half of
the seal (6) by tapping it out
lightly from the top of the seal
plate and then clean the area
with a cloth.
11. Remove the four bolts (16)
holding the motor (12) onto
the seal plate (10) and tap the
shaft and rotor assembly out
with a plastic or rawhide
hammer. The lower ball
bearing will come out with the
shaft and rotor assembly. If
the bearing is rusted or feels
rough when turned, it should
be replaced as in Step 13.
12.Coat the replacement seal (6)
with a thin oil (dielectric,
same as in motor housing)
coating and use a plastic
pusher to install the seal (6)
into the seal plate (10). Do not
use any sharp instruments that
may damage the seal. Do not
chip, scratch or mar the carbon
face.
13.If ball bearing replacement is
necessary as determined in
Step 11, press the bearing on
the shaft, pushing only on the
inner face. If a press is not
available, the bearing can be
tapped on using a sleeve that
bears only on the inner face.
Pressing on the outer face will
result in flat spots on the bearing
and cause early failure.
14.Push the new rotor shaft and
ball bearing assembly into
the seal plate. (Note that the
replacement rotor must be of
the same manufacture as the
existing stator, or vice versa.)
Reassemble the stator (12) to
the seal plate (10) with the four
long cap screws (16). Be sure
to tighten down the bolts
evenly and firmly to prevent
cocking of the stator. An
uneven assembly can cause the
rotor to rub the motor causing
the motor to short.
15.Press the new ceramic seal (6)
in place with the rubber
ring facing the impeller.
This should have a thin oil
(dielectric, same as in motor
housing) coating.
Note: Ceramic must be kept
clean. Any dirt will cause
seal failure.
16.Start the impeller on the shaft
one to two turns; then add a
drop of Loctite #277 to the
impeller threads and screw
the impeller hand tight. The
impeller will force the ceramic
seal into position. The shaft
should be free of dirt, grease,
etc., or the Loctite will not
hold as designed.
Note: Loctite overrun onto the
seal or bearing will result in
shaft seizure.
17.Remove the old seal ring (8)
and stretch on new ring with
O-ring lube.
Do not roll the ring onto seal
plate or water leakage into the
motor housing will result.
18.Fasten the ground wire inside
the motor housing and tuck
wires up into the housing to
prevent rubbing on the rotor;
then assemble housing (4) to
volute (9) with bolts (7).
19.Check for seal leaks by
pressurizing the pump to 7 to 9