
6
Generally these pumps give
very reliable service and can be
expected to operate for years
on normal sewage pumping
without failure.
Lightning:
In some areas where consid-
erable lightning occurs, it is
recommended that a light-
ning arrestor be installed at the
control panel.
Complete data on lightning
arrestors and cost is available
from the factory. Lightning
arrestors are good insur-
ance against damage to an
expensive motor.
Field Service on Motor:
All submersible motors out of
warranty can be serviced in the
field by any reliable motor service
shop. Any pump (in warranty)
must be returned to the factory
for service or repaired at an
authorized Hydromatic service
center. Charges will not be
allowed if (in warranty) pump
is not taken to an authorized
Hydromatic service center.
When field service is performed
on a pump, these instructions
should be carefully followed.
Replacing Stator:
1. If stator only is damaged,
it may not be necessary to
completely dismantle pump as
stator and housing can be lifted
from pump without disturbing
seals or bearings.
2. Drain all oil from upper
housing, remove from upper
housing, remove drain plug in
bottom of stator housing and
remove plug in top of housing
to allow air to enter.
3. After chamber is drained,
remove hold-down bolts
and lift off. Use care in
lifting as the seal failure
connecting wire must be
disconnected before housing
is completely removed.
4. Set assembly on bench and
remove connection box. When
box is lifted off, connection
wires to motor will be exposed.
These wires will probably
be burned, but each wire is
tagged with a metal marker
giving wire number. Cut the
wires.
If the leads to the connection
box are burned, a complete
new connection 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
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 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 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 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 O-ring.
This applies to all O-rings used
in assembly.
10.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 auxiliary
control cable.
11.For safety, complete pump
should be air checked under
water for leaks. 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 high grade transformer
oil or regular Hydromatic
submersible oil in this chamber.
Replace plug; use Permatex on
threads. Install air valve in top
plug opening 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.
12.Refill motor chamber with oil.
Use high grade transformer
oil or Hydromatic special
Pump
Maintenance