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Assembling the Pump/Grinder Mechanism
To assemble the pump/grinder:
1. If the Rotor was removed, slide the Rotor over the armature shaft, compressing the seal
spring. The spring washer may need to be aligned with the shoulder of the Armature Shaft.
Press the groove pin into place with channel lock pliers. Lubricating the groove pin will help to
ease the installation. Do not use a hammer to beat in groove pin; doing so may bend the
Armature Shaft.
2. Install the new pump Stator and Liner over the Rotor. The Rotor or internal bore of Stator
should be lubricated with a small amount of silicone grease; most new Stators are lubricated at
the factory. Ensure the lip of the Stator is uniformly seated in the Motor Head groove.
3. If not already done, remove the old pump Liner from Suction Housing.
4. Install the Suction Housing. Tighten the bolts diagonally to maintain housing alignment with
the Armature Shaft. Failure to align properly will cause the Cutter Wheel to hit the Shredder
Ring.
5. Apply a small amount of Anti-Seize to the threads of the Armature Shaft and hand– tighten
the Cutter Wheel onto the shaft. Do not over tighten the Cutter Wheel; it will be difficult to
remove the next time the unit is serviced.
6. Seat the Shredder Ring in the Suction Housing assuring that the four notched ears are
properly aligned with the four threaded holes. Set with a rubber mallet or hammer and a block of
wood. Do not strike the Shredder Ring with a steel hammer. Start with one side, maintain
pressure on it and drive the opposite side into place. Ensure the Shredder Ring is seated all the
way around.
7. Rotate the Cutter Wheel to ensure it does not interfere with the Shredder Ring.
8. Install the Inlet Shroud. Tighten the four screws diagonally
9. Reinstall the core. Be sure to open all the valves on the discharge plumbing before turning on
the power. Verify that the voltage and amperage readings are correct.
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