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7
Service one hammer assembly at a
time. Use a ball peen hammer and
pin punch to remove the roll pins
from each spacer and shaft as shown.
(Discard the roll pins. Use new pins
during reassembly.) Pull the shaft
out of the rotor, catching the spacers
and hammers with your free hand.
Inspect the shafts and spacers for
unusual wear. Replace them, if nec-
essary.
Reverse each worn hammer, or
replace them as need be. Note how
the Y-hammers are positioned in
relation to one another. Shafts with
two hammers must be reassembled
so that the bent prongs face inward
and towards one another; the single
hammers face their prongs in oppo-
site, outward directions. Secure the
spacers with new roll pins using your
ball peen hammer and punch pin.
If not servicing the knives, reassemble
your unit by following 1 through 6 in
reverse order.
8
With the chipper cone and base
removed, slowly turn the rotor clock-
wise with a probe until a chipper
knife appears in the hole. First,
scrape out any pulp embedded in the
heads of the screws. Loosen the
screws using the 3/16” Allen wrench
provided with your unit. Unscrew
them by hand and remove the knife.
Rotate the rotor slowly and remove
the second knife in this same way.
Sharpen the knives evenly at 30°
angles. A homeowner’s bench
grinder with a fine grit stone will do,
but because the knives are specially
treated, too much heat will make
them brittle. Grind only a little bit
at a time and allow them to cool.
Slow-speed, water-cooled grinding is
preferred. For best results, see your
local machine shop specialist.
Knives must be replaced once the
bases of their cutting edges are
ground within 1/8” of the mounting
holes.
Reassemble your chipper-shredder-vac by
following these instructions in reverse.
Sharpen the
chipping knives
when they
lose their
self-feeding
action.
Minimum
distance = 1/8”
Single hammer, fork
facing out.
Single hammer, fork
facing in.
CORRECT “STAGGERING”
OF HAMMERS
SHOWN HERE:
Removing a
knife without
disassembling
the housings.
page 15