4. Unscrew the four hex head cap screws and remove pump base. Use care not to damage O-ring if it is to be
reused.
5. Radial cutter and axial cutter are now exposed. If checking for clogging, these parts can now be cleaned and
inspected without removing them from the shaft.
6. Cutter rind and axial cutter can be inverted to bring into use new surfaces, if not previously done, to double the
cutter life.
If it is necessary to replace the cutters, (or invert them) remove the three screws and remove cutter ring from
pump base.
Remove the screw, the washer and the radial cutter from the shaft. The axial cutter lifts off of the impeller and
is made to rotate with the impeller by use of a roll pin. Remove impeller from shaft in same manner as radial
cutter and remove shim(s). Remove snap ring.
7. Clean all parts thoroughly before proceeding with assembly. Replace shim(s), replace impeller, roll pin, axial
cutter, radial cutter and secure with the washer and screw.
8. Proper clearance between pump base and impeller blades is .018 to .030. This spacing is controlled through
use of shim(s).
9. Replace cutter ring in pump base and three screws. Tighten screws.
10. Replace O-ring in pump base and assemble to unit with the four capscrews, lockwashers and nuts.
WARNING: Keep hands and clothing clear of cutter elements at all times.
11. Turn power on and operate pump for a few seconds only to be sure parts are not rubbing.
Replacing Seals and Bearings
The Liquidator uses a water filled design motor. Seals should not require replacement until you replace the
bearings or generally rebuild the motor due to normal wear.
1. Remove cutters, impeller and pump parts as described under “Replacing Grinder Parts”.
NOTE: When volute with bearing or upper end cap are removed the motor fill fluid will spill out.
2. The two lip seals can now be removed using packing hooks. Check for wear of the sleeve bearing integrally
molded into volute or wear on the shaft at journal areas of shaft/rotor assembly at this time. If wear indicates
replacement of bearings or shaft, further disassembly is required. To replace the two lip seals at this time,
assure that the parts are clean and place the seals in their proper location before reassembly.
3. To access the lower bearing in volute remove the four screws and washers. Remove the volute with bearing
from the shaft. Just above the radial bearing will be found the thrust bearing assembly. It consists of a thrust
shoe retainer, three thrust shoe segments, a carbon disc and a retainer washer. Note that two O-rings are used
on the volute with bearing assembly.
4. The rotor and shaft assembly can now be removed. Note that there is an up-thrust washer(s) used on top of the
rotor.
To access the upper bearing housing, remove the four capscrews and washers from the upper end cap. You will
now be able to lift off the rubber breather diaphragm that contains the filter. Visible now will be the top of the
motor shaft, if not removed earlier, and the bearing housing. Pull the bearing housing up to remove. (Some
force may be required due to pressure of O-ring seals.) Note positions of O-rings. Note also that the stator is
now free from all other parts.
Disassembly is now complete.
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