4
Pump
Maintenance
(14) in seal plate (26) and
screw two of the screws into
the tapped back off holes
to force seal plate (26) from
seal housing (31). Pulling this
plate (26) off will also force
lower seal (18) from shaft.
Remove lower seal (18) from
seal plate (26).
4. Remove snap ring (29) and
pull upper seal (11) from shaft.
It may be necessary to use
packing hooks to remove seal.
Use a screwdriver to break
the upper stationary ceramic
seal ring so that it can be
removed easily.
CAUTION: Do not use any old
seal parts. Replace all parts
with new pieces. Mixing old and
new parts will cause immediate
seal failure.
5. When cleaning all parts before
replacement, check to be sure
sleeve bearing or shaft is not
worn. Be sure all “O” rings are
in excellent condition without
cuts or nicks, and replace them
if not in excellent condition.
Use “O” ring lube to prevent
cutting at assembly.
6. After all parts are replaced and
before final assembly of
impeller and cutters (step 8 of
“Replacing Grinder Parts”),
refill seal chamber and motor
chamber with oil. Lay pump
on side to fill seal chamber.
DO NOT FILL COMPLETELY,
ALLOW ABOUT 1⁄2 INCH
BELOW FILL PLUG SO
THAT THERE WILL BE
AN AIR SPACE FOR
EXPANSION. Set pump
upright, and replace the upper
and side drain plugs (10)
before filling motor chamber.
Again fill so that oil level is
just over the top of winding to
allow air space for expansion.
7. Use only a high grade
transformer oil in the motor
chamber and in the seal chamber.
Replacing Motor Stator:
1. If necessary to replace stator,
completely dismantle pump as
described above.
2. Remove shaft rotor assembly
(35). If the ball bearing (4)
feels rough when turned,
it should be replaced.
PRESSING ON THE OUTER
RACE WILL RUIN THE
BEARING. When shaft rotor
assembly are removed, motor
leads can be disconnected
through the cord cap
bore. DO NOT
TAPE
LEADS WHEN REPLACING
STATOR AS OIL
WILL
DETERIORATE THE TAPE
AND CAUSE MOTOR
FAILURE. USE ONLY
TWIST ON WIRE NUTS.
3. Remove motor housing bolts
(32) and lift off housing (37).
4. Remove stator screws (14) and
stator clamping ring (33) and
set housing (37) on hardwood
blocks. Bump housing (37) up
and down on hardwood block
to loosen stator which should
drop out. A stator back-up
ring (36), installed on some 3
horsepower pumps, will also
fall out.
5. Thoroughly clean housing (37)
and other parts and install new
stator.
6. Connect leads through housing
bore and tuck leads back
behind the stator windings to
prevent rubbing on rotor.
USE ONLY BUTT SPLICE
CONNECTORS.
8. In reassembly replace any “O”
rings that are defective. Use
Parker “O” Ring Lub on all
“O” rings for easy assembly
and to prevent cutting.
9. Completely reassemble, air test
and fill with oil as described
under REPLACING SEALS.
10.Always run pump for a few
seconds after assembly work to
be sure all parts run smoothly
and are correctly adjusted
before replacing in sump.
Check again for correct
rotation. Pump should rotate
counterclockwise when viewed
from the suction.
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