
7
Replacing Seals and Bearings:
1. Drain all oil from motor
chamber and seal chamber
as described.
2. Remove motor housing as
de scribed.
3. Remove bolts that hold seal
cham ber to pump housing. Use
back-off screws to break loose.
With hardwood block, tape end
of impeller to loosen from
shaft. When free, re move
impeller from shaft.
4. Lift rotating assembly (rotor,
shaft and impeller) from pump
case and place horizontally
on bench.
5. Impeller Removal — S4MRC
Hold rotor and remove bolt
and washer from impeller end
of shaft, then thread bolt back
into shaft. The impeller is
keyed to the shaft, so by using
a screwdriver on opposite sides
behind the impeller, apply
force, then tap on the end of
the bolt to break im pel ler loose
from taper shaft. Remove
impeller.
IMPORTANT: The impeller is
designed to be self-tightening
when running so impeller may
be difficult to break loose. If this
is the case, use plastic or rubber
hammer on im pel ler tip to free.
Remove impeller.
6. Shaft sleeves are not used.
7. Remove lower seal spring and
pry out seal with screwdriver.
8. To remove seal housing, take
out socket head bolts and using
bolts in back of holes, pry
plates loose. This will force out
lower seal if not already
removed.
If the leads to the connection
box are burned, a complete
new con nec tion box with new
wire must be used. The wires
are potted in with sealing
compound and a new unit must
be obtained from the factory.
5. The stator is held in the
housing with a bolted-in
clamp ring.
6. After ring is removed, turn
hous ing upright and bump on
hard wood 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 con nec tions to connection
box 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
de te ri o rate the tape and cause
damage to stator and bear ings.
8. Drain oil from chamber. If
oil is clean and no water
is present, seals can be
considered sat is fac to ry to
reuse.
9. Check top bearing. If clean and
does not turn rough, bearings
can be reused and it is not
necessary to com plete ly
dismantle pump to change
bearings. If bearings are
damaged with dirt or heat,
they must be replaced. See
additional instructions on
replacing seals and bear ings
(Page 7). Remember to
reinstall the upper bearing
load spring.
10.Replace stator housing onto
seal chamber and bolt in place.
Be sure seal failure wire
is connected before housing
is assembled.
Be sure O-ring seal has been
replaced. If O-ring is nicked or
cut, replace with new ones.
This ap plies to all O-rings
used in as sem bly.
11. After all leads are reconnected
in the connection box, make a
high voltage ground test on
each wire. The only wire that
should show ground is the
green power lead and the
ground lead in the aux il ia ry
control cable.
12.For safety, complete pump
should be air checked under
water for leaks. If seals were
OK, refill seal cham ber with
oil. Lay pump on side for this
oil filling with oil fill hole
upright. Do not completely
fill; leave oil about 1 inch
below plug hole. Use only
Hydro matic sub mers ible oil in
this chamber or high grade
trans form er oil. Re place plug;
use Permatex on threads.
Install air valve in top plug
open ing of motor housing and
charge housing with about
10 psi of air. Be sure air is dry.
Do not use air line where
water may be trapped in the
line. Submerge complete unit
under water and check
for leaks.
13.Refill the motor chamber
with oil. Use high grade
transformer oil or Hydromatic
special submers ible oil. Fill
chamber until oil covers top of
windings. Leave airspace in
top for expansion. Use
Permatex on plug threads.