INSPECTION
All parts should be cleaned, inspected for
serviceability and replaced if necessary.
Microcut head: Inspect for damage or
wear, see “Inspection”, page 67.
Impeller: Clean and inspect for damage or
wear.When impeller tips become worn (round-
ed on leading edge) impeller should be re-
placed or returned to the factory for retipping.
If impeller is worn excessively, it must be re-
placed (Figure 36).
Face seal and mating ring: Some feed
assemblies have a face seal in lower retaining
ring with a mating ring on impeller. Clean and
inspect seal. Carbon ring (nose seal) should
move up and down freely. Replace if neces-
sary, see “Reassembly”, page 49. “O” ring
should also be replaced along with nose seal.
Mating surfaces on seal and ring should be
free from nicks and scratches.
Feed adapter and lower retaining
ring: Mating surfaces should be free of nicks
and scratches.
Wear rings: Rings need not be removed
from feed adapter and lower retaining ring un-
less they appear damaged or worn. All studs
should be secure. Outer edge of ring will even-
tually become notched from blades, and ring
must be replaced.
NOTE:
If notches appear diagonal instead
of vertical, blades have been installed incor-
rectly (Figure 37).
MAINTENANCE
Feed Assembly, Microcut Head
48
Figure 36 — Repairable (left) and scrap (right) impellers
Figure 37 — Diagonal notches on wear ring (bottom)
indicate blades have been installed incorrectly.
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