6. Large screwdriver with heavy handle.
7. Wire brush.
8. Three cornered file.
IMPORTANT – Pump should be thoroughly cleaned of trash and deposits before starting disassembly operations.
CAUTION – DISCONNECT ALL POWER AND CONTROL WIRES TO MOTOR AT CONTROL PANEL
BEFORE STARTING DISASSEMBLY OPERATIONS. NEVER RELY ON OPENING CIRCUIT
BREAKER ONLY.
DISASSEMBLY OF SHREDDING RING AND IMPELLER
1. Remove three screws from grinder ring flange. Grinder ring is pressed into flange for easy removal.
2. Thread two screws into tapped back-off holes in flange and evenly tighten screws to back grinding ring out of
pump housing.
3. Hold grinder by prying against impeller cutting bar and remove cap screw from end of shaft.
4. Use large screwdriver in slot in end of shaft and bump on cutter vane with plastic hammer. Bump in
counterclockwise direction as thread is right hand. It may take several bumps to loosen impeller.
If impeller cannot be loosened it will be necessary to take unit to service station for service. DON’T
CONTINUE TO POUND ON IMPELLER AS IMPELLER AND SHAFT CAN BE DAMAGED.
5. If impeller comes off easily, clean up and replace if worn.
6. Be sure pump impeller has not loosened when grinder impeller is removed. This can be checked on reassembly
of grinder impeller and shredding ring. Tips of impeller cutter vanes should extend about 1/8” below bottom of
shredding ring. If more than 1/8” extends below ring it means pump impeller has loosened, and if it is less, it
means the shredding ring is not properly seated.
If the pump impeller has loosened, remove grinder impeller and shredding ring as described above and remove
bolts from volute case and remove case. Plastic hammer can be used to bump on casing discharge to loosen.
Place gasket in oil to prevent drying out. DO NOT loosen the pump impeller further – it is the seat for the
lower seal spring.
7. After case is removed, wrap emery paper around shaft and hold with vise grip pliers. Use cloth on impeller and
screw up against shoulder. Now pump can be reassembled.
8. Clean all threads with wire brush and file smooth any threads that may be nicked.
9. Use Never-Seeze or other graphite compound on threads before replacing grinder impeller.
10. Be sure cap screw in bottom of shaft is tight. Hold impeller with screwdriver between cutter bar and teeth of
shredding ring while tightening cap screw.
11. Be sure impeller turns free by hand after reassembly. Some drag will occur due to seals but there should be no
binding or tight spots when turning the grinder impeller.
12. If impeller rubs or drags on shredding ring, loosen bolts in shredding ring plate and tap with plastic hammer to
loosen, retighten screws. Be sure to pull screws down evenly, applying pressure on all three screws. DO NOT
TIGHTEN ONE SCREW CLEAR DOWN BEFORE ADJUSTING OTHER SCREWS.
13. ALWAYS use a rag on the impellers when turning to prevent cutting hands on the sharp corners of shredding
ring.
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