6
Pump
Maintenance
6. After stator retaining ring is
removed, turn housing upright
and bump on hardwood
blocks. This should jar the
stator loose and allow it to
drop out.
7. Thoroughly clean housing
before replacing new stator.
Replace stator and make all
wire connections to cord cap
assembly before replacing
housing on pump. This is
important as leads must be
tucked behind the windings
by using hands up through
rotor core.
IMPORTANT: Use only
compression type insulated
connectors on the wires. Do not
tape leads as oil will deteriorate
the tape and cause damage to
stator and bearings.
8. Check top bearing. If clean and
does not turn rough, bearings
can be reused and it is not
necessary to completely
dismantle pump to change
bearings. If bearings are
damaged with dirt or heat, they
must be replaced. See
additional instructions on
replacing seals and bearings.
Remember to reinstall the
upper bearing load spring.
9. Replace stator housing onto
seal chamber and bolt in place.
Be sure O-ring seal has been
replaced. If O-ring is nicked or
cut, replace the new rings. This
applies to all O-rings used
in assembly.
10.After all leads are
reconnected, make a high
voltage ground test on each
wire. The only wire that should
show ground is the green
power lead.
11.Refill motor chamber with
oil. Use only high grade
transformer oil or regular
HYDROMATIC
special
submersible oil. Fill chamber
until oil covers top of
windings. Leave air space in
top for expansion. Use
permatex on plug threads.
Replacing Seals And Bearings
1. Drain all oil from motor
chamber as described.
2. Remove bolts that hold motor
housing to pump housing.
Remove screws holding seal
plate to motor housing.
3. Lift rotating assembly (rotor,
shaft and impeller) from pump
case and place horizontally on
bench. With hardwood block,
tap end of impeller to loosen
from shaft.
4. Shaft sleeves are not used.
5. Remove lower seal spring and
pry out seal with screwdriver.
6. Use bearing puller to remove
bearings. Replace with new
bearings. Press only on inner
race of bearing when
replacing. Pressing on outer
race can damage the bearing.
Bearings are standard size
that can be obtained from
any bearing supply house
or can be obtained from
HYDROMATIC factory.
7. IMPORTANT: Do not use
any of the old seal parts.
Replace with all new seals.
8. Thoroughly clean all castings
before replacing seals. One
grain of dirt between the seal
faces can cause failure.
Examine all O-rings for nicks
before reusing.
9. Use Locktite on socket head
locking screw in end of shaft.
10.Before refilling chamber with
oil, air test as described above.
11.Refill chamber with oil as
described above.
12.Always check all leads with
high voltage or with megger
for grounds before operating
the pump.
CONNECTION DIAGRAM FOR LEADS IN
MOTOR AND CONNECTION BOX
(Y) WYE MOTOR CONNECTIONS
230 VOLTS
460 VOLTS
GREEN
GREEN
L3
L2
L1
L3
L2
L1
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
Fig. 1
