Maintenance/Repairs
REPLACING
THE
fAN
BLADES
A broken or severely bent fan
blade can cause an unbalanced
rotor assembly, resulting in abnor-
mal vibration and poor vacuuming
performance. To ensure a properly
balanced rotor assembly, the four
fan blades (A, Figure 5-8) must be
replaced as a complete set.
WARNING
To
Prevent
Personal
Injury:
•
The
chipper
blade
on
the
rotor
assembly
is
very
sharp.
Wear
thick
gloves
and
handle
the
rotor
assembly
with
ex-
treme
care.
•
Do
not
operate
machine
unless
fan
cover
is
securely
installed.
To
Replace
the
Fan
Blades
1.
Shut
off
the engine, discon-
nect the spark plug wire from the
spark plug,
and
make sure that
all moving parts have come
to
a
complete stop.
2. The fan blades are attached to
the rotor assembly
(B, Figure 5-8)
by eight flat head socket screws
(C) and nylon collar locknuts (D).
To
remove the fan blades, first re-
move the rotor assembly by fol-
lowing Steps 2 through 3d
of
the
chipper blade removal instructions
that begin on Page 38. After re-
moving the rotor assembly, pro-
ceed to Step 3 below.
3. Take off each fan blade by re-
moving the eight screws and lock-
nuts using a 3/16" hex key (Allen)
wrench and 1/2" combination
wrench. (If necessary, use a sharp
nail
or
awl to clean out the socket
holes in each screw.)
Throwaway
the fan blades, screws and lock-
nuts.
4. Clean the countersunk holes
and the face
of
the rotor assembly
to allow the screws and fan blades
to seat properly. Then, using the
new hardware supplied with the
new fan blades, install the fan
blades as shown in Figure 5-8.
Tighten the locknuts securely (if
using a torque wrench, tighten
locknuts to 25 ft.-lbs.).
5. Reinstall the rotor assembly by
following Steps 8 through
13
of
the chipper blade removal instruc-
tions on Page 39.
6. Reinstall the shredder screen
and the fan cover (see Page 23).
7. Start the engine and listen for
any unusual noise or vibration that
could signal improper installation
of
the fan blades
or
rotor assembly.
If
there
is
an unusual noise or vi-
bration, stop the engine immedi-
ately and call the Factory
or
con-
tact your local authorized service
dealer.
Do
not attempt to operate
the machine until the problem
has been corrected.
Figure 5-8: Fan blade (A),
rotor
assembly (8), flat head
socket
screw
(e),
and
locknut
(D).
40
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