Troy-Bilt 47260 Owner/Operator Manua page 47

Maintenance/Repairs
Figure 5-7: Chipper blade (A), rotor assembly (8), flat head
socket screws (C), locknuts (D), mounting bolt (E), conical washer
(F), flat washer (G), key (H), shims (I), and 'jacking" holes (J).
b.) Place the boxed end of a 9/16"
wrench on the rotor assembly
mounting bolt (E) and loosen the
bolt by sharply tapping the open
end of the wrench with a rubber
mallet (do not use a metal hammer,
the hammer or wrench could shat-
ter and cause personal injury).
Remove the bolt, conical washer
(F)
and flat washer
(G).
c.) Lightly tap around the circum-
ference of the rotor assembly with
a rubber mallet. While avoiding
the chipper cutting blade on the
back of the rotor assembly, pull the
rotor assembly straight off the en-
gine crankshaft. Do not lose the
key
(H)
or shims
(I).
NOTE: The
shims may be located inside the
hub of the rotor assembly.
If the rotor assembly is difficult to
remove, proceed to Step 3-d.
d.) Loosely install two 3/8"-16 x 2"
threaded full length hex head
screws (not supplied) into the
"jacking" holes
(J).
Then, using a
9/16" wrench, alternately and
evenly tighten the two screws 1/8
turn at a time. When the screws
bottom against the machine hous-
ing, the rotor assembly will begin
to back off the engine crankshaft.
Remove the screws from the
"jacking" holes after removing
the rotor assembly.
4. Using a sharp nail or an awl,
clean out the socket holes in the
blade mounting screws.
5. Using a 5/32" hex key (Allen)
wrench and a 7/16" combination
wrench, remove the three screws
and nuts from the chipper blade.
6.
Thoroughly clean the recessed
area where the blade seats on the
rotor assembly. If reinstalling an
old blade, make sure it is clean.
7. Install the blade with the sharp
edge facing away from the rotor
assembly and pointing toward the
slot in the rotor assembly. Install
the three mounting screws and
locknuts (use the new hardware
supplied with a new blade) and
tighten the locknuts securely. (If
using a torque wrench, tighten
locknuts to 12 ft.-lbs.)
8. Thoroughly clean the fan cham-
ber and the engine crankshaft.
Apply a generous coating of fresh,
automotive-quality general pur-
pose grease to the crankshaft.
9.
Reinstall the shims
(I)
in the
hub of the rotor assembly. The
thicker, .060" hardened shim(s)
goes in the hub first, followed by
the standard, .020" shims (as re-
quired). Be sure to use the same
number of shims that were re-
moved in Step 3-c.
10. Reinstall the key (H) in the
crankshaft keyway.
11. Align the keyway in the rotor
assembly with the crankshaft key
and carefully slide the rotor assem-
bly onto the crankshaft.
12. Thoroughly clean the mount-
ing bolt
(E).
Place the conical
washer
(F)
(raised side of washer
faces bolt head) on the bolt, fol-
lowed by the flat washer
(G).
G
E
~
1)
I~
f7?
Apply a coating of Locktite 242
(or equivalent) removable thread
locking compound to the bolt
threads. Carefully follow the in-
structions supplied with the thread
locking compound.
13. Prevent the rotor assembly
from turning in a clockwise direc-
tion. Then, install the bolt and
tighten it securely (if using a
torque wrench, tighten to 35-40
ft.-lbs). Remove the wood block
or dowel used to prevent the rotor
from turning.
14. Reinstall the shredder screen
and the fan cover (see Page 23).
15. Start the engine and listen for
any unusual noise or vibration that
could signal improper installation
of the chipper blade or rotor as-
sembly. If there is an unusual
noise or vibration, stop the engine
immediately and call the Factory
or contact your local authorized
service dealer. Do not attempt to
operate the machine until the
problem has been corrected.
39