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Maintenance
Reassembly
1. Thoroughly clean the seal (14) 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.
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 motor 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.
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 (2) thoroughly, then
position it onto the seal plate.
10. Press the new ceramic seal (14) in place with
the rubber ring facing the impeller. This should
have a thin oil (dielectric, same as in motor
housing) coating.
NOTICE: Ceramic must be kept clean. Any dirt
will cause seal failure. Also, 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.
2
12. Add a drop of
Loctite® #243 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. Replace impeller washer and
impeller screw to the shaft on three phase models.
2
Henkel Corporation, Germany
NOTICE: Loctite® overrun onto the seal or bearing
will result in shaft seizure.
13. Install bottom plate (12) and gasket (15).
14. To replace the power cord (22) on single phase
pumps, first slip the stator lead wires through the
holes in the wire seal assembly. Coat the cord grip
threads with PTFE pipe thread sealant tape and
screw the new power cord assembly into the motor
housing. Referring to wiring diagrams in this manual,
secure wires together with wire nuts.
NOTICE Do not tape leads together as the hot oil
will deteriorate the tape and cause failure.
15. Before filling the motor housing with oil, a seal leak
test should be performed. Apply 7 to 8 pounds of
air pressure in the 1/4" NPT tap (6) on the top of the
motor cover and seal chamber.
NOTICE Too much pressure will damage the seal.
Seal would have to be replaced.
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
failed part.
Hydromatic pumps have a small air vent hole in
the impeller cavity to let out trapped air. If this hole
becomes plugged, pump may air lock. To break the
air lock, use a small screwdriver to clear hole in the
impeller cavity.
As a secondary precaution in installations of this
type, an 1⁄8" hole should be drilled in the discharge
pipe just above the volute. The check valve should
be at least 12 inches above pump discharge and
mounted horizontally. Do not put check valve
directly into pump discharge opening.
NOTICE: In sumps where the pump is operating
daily, air locking rarely occurs.
Oil fill
1. After seal leak test is satisfactory, remove unit from
water and wipe or blow off any excess water.
2. Do not put oil in motor with any water present in
motor cavity.
3. Use refined paraffinic transformer oil,
2210 or equivalent.
3
Shell Oil Company, Texas
4. Slowly fill oil to 1/8" over windings in motor housing
through opening (6). Use an oil fill tube that will go
into holes so that air can escape. Replace plug (6).
NOTICE Do not fill the motor housing completely –
allow air space for expansion.
5. Connect power cord wires to terminals in panel, or
connect power source, and check pump running.
Motor should run smoothly and be free of vibration.
Pump is ready for operation.
7
3
Shellflex™
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