Pentair Pool Products Hydromatic OSP50 Owner's Manual page 5

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
impeller cavity.
As a secondary precaution in
installations of this type —
1⁄16" hole should be drilled in
the discharge pipe below the
check valve. The check valve
should be 12 to 18 inches
above pump discharge. Do not
put check valve directly into
pump discharge opening.
NOTE: In sumps where the
pump is operating daily, air
locking rarely occurs.
6. Check the oil. Remove the
pipe plug (4) in the top of the
motor cover and drain oil into
a clean, dry container. A milky
appearance to the oil indicates
that water has entered through
either worn out or damaged
seals (23, 24), seal ring (20),
or cord nut.
7. Remove the motor cover.
Remove the four hex head cap
screws (22). Use a screwdriver
to pry the motor cover (19)
from the volute case (21) at the
fastening ears, being careful
not to cut the seal ring (20)
with the screwdriver
crack the motor cover. Lift
the motor cover until it clears
the stator (15).
8. Check for short. Disconnect
the stator leads (7, 8, 9) from
the connector (6). Use an
ohmmeter to check
continuity of the
stator fails to
continuity
be replaced.
9. Remove the stator. To remove
the stator, remove the four hex
head screws (12) and the stator
plate (13). Lift the
in the
the volute case (21) and
set aside.
10.Remove the impeller. To
remove the impeller (25), hold
the rotor (16) in your hand
and tap the impeller with
a plastic or rubber mallet
so as to turn the impeller
counterclockwise.
11.Check the seal. Remove the
rotating portion of seal (24)
from shaft by inserting a
screwdriver under the edge of
or
the
stator. If
pass the
test, it must
stator off
12.Remove rotor and shaft. Tap
the seal and lifting it off
without damaging seal. Inspect
the seal face for any nicks or
an uneven seating of seal face.
If any are present, replace the
seal. (See Step 14.)
the rotor shaft (16) at the
impeller end of the shaft with a
plastic mallet to remove the
rotor and shaft. Inspect the
bearings (17). If they do not
rotate freely and smoothly,
they should be replaced. When
new bearings are ready to be
added onto the shaft, do not
push on outer face of bearings.
This will damage bearings. If a
rotor and shaft are ordered
from Hydromatic, the bearings
will be supplied
pressed on the shaft.
already
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