and “Replacing Cutter Parts”
sections of this manual.
3. Remove the pump rotor per
instructions listed under replacing
grinder parts section in this
manual.
4. Remove the seal (17) rotating
elements by sliding the spring
bellows off the common shaft,
then using two screwdrivers,
slide the carbon seal assembly
off by prying on the retaining
ring.
5. Using a screwdriver, break the
old stationary portion of the
seal (17) to allow for removal.
6. Take the stationary portion of
the new seal (17), and lube the
rubber material with good
quality dielectric oil. Press the
stationary portion of the new
seal into the seal/bearing
housing (2).
CAUTION: Do not reuse old
seal parts. Replace all parts
with new. Mixing old and new
parts could cause immediate
seal failure.
7. Using a good quality
dielectric oil, lube the rubber
material on the carbon seal
assembly (17) and press it on
the common shaft.
8. Using a pressure gauge with a
fill stem, pressurize the motor
housing no more than 7 psig
with dried air and check for
leaks. If after several minutes
the gauge reads the same,
the seal is good and you can
continue with assembly.
Note: It is normal to observe
some air bubbles in the seal
area initially as the seal seats.
If bubbles do not stop within
a few seconds, the seal is either
not properly installed or is
damaged.
5. Clean all parts thoroughly
before proceeding with
reassembly. Slide new rotor
(22) on common shaft and
carefully replace lower roll
pin (6). Place stator boot
(21) back in volute recess,
replace retainer ring (8) and
tighten screws (9). Place
volute (1) carefully back over
rotor (22) and reattach to
seal/bearing housing (2) with
socket head screws (12).
6. Replace radial cutter (3) on
common shaft. Lightly tap
radial cutter (3) clockwise to
ensure full engagement onto
common shaft.
7. Replace stationary cutter
assembly (4) and screw
it down with screws (5).
Carefully rotate shaft by using
screwdriver in slot on shaft, to
ensure free rotation of pump.
8. Plug pump into power source
and operate for a few seconds
only (refer to caution note
below) to ensure parts are
not rubbing under electrical
operation.
9. Replace stationary cutter
assembly (4), and screw down
with screws (5).
10. Plug pump into power and
operate for a few seconds only
to ensure parts are not rubbing.
CAUTION: Do not run dry
longer than 10 seconds maximum,
otherwise damage to stator boot
can occur.
Replacing Seal:
1. Drain the oil from the pump by
removing the fill plug (10)
located on the side of the
motor housing (18).
2. Remove the volute and cutters
per the instructions listed
under “Stator Boot and Rotor
Inspection and/or Replacement”
9. Reassemble the pump rotor,
cutter and volute as outlined
in the replacing cutter parts
section of this manual.
10.Refill motor housing with a
good quality dielectric oil. Fill the
motor housing so that the tops
of the motor windings have been
covered, but leave an air gap to
allow for expansion of the oil.
Note: When applying power, be
sure the pump is restrained
from turning by holding the
pump at the motor housing,
or by clamping it in a holding
fixture.
WARNING: Severe injury may
result from accidental contact
with moving cutter. Keep
clothing, hands and feet away
from cutter any time power is
connected to the pump.
Below is a list of troubles and
their probable causes:
No liquid delivered
1. Pump airbound
2. Discharge head too high
3. Pump or piping plugged
4. Speed too low
Insufficient liquid delivered
1. Discharge head too high
2. Cutter partially
plugged or
damaged
3. Stator boot or rotor damaged
or worn
4. Speed too low
Insufficient discharge pressure
1. Air or gases in liquid
2. Stator boot or rotor damaged
or worn
3. Speed too low
5
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