Sears 645B - Manual (Page 10)

NOTE: When reassembling, make certain thi} open­
ing on the back-up plate is toward the bottom of the
unit. The back-up plate may be reversed to piovide a
new cutting edge.
Allen
Screws
FIGURE 16.
Torque
Wrench
5. Loosen the two hand knobs and cupped washers
which secure the chute deflector, and raise the
chute deflector.
6 . Insert a 1/2" or 3/4” diameter pipe through the flail
screen into the impellers assembly to keep it from
turning, or remove the flail screen, and insert a
piece of wood (2 x 4) into the chute openi ig.
7. Remove the two outside screws on the blade,
using a 3/16" alien wrench and a 1/2" wrench.
8 . Remove the blade by removing the cer ter bolt,
lock washer and flat washer.
NOTE: Use caution when removing the blade to avoid
contacting the weld bolts on the housing.
When sharpening the blade, follow the origir al angle
of grind as a guide. It is extremely important tiat each
cutting edge receives an equal amount of gr nding to
prevent an unbalanced blade. An unbalanced blade
will cause excessive vibration when rotatinc at high
speeds and may cause damage to the unit.
The blade can be tested for balance by balancing it
on a round shaft screwdriver or nail. Remo/e metal
from the heavy side until it is balanced evenly. See
figure 17.
When reassembling the blade, tighten to between 550
and 650 inch pounds, or lacking torque wrench, tight­
en securely.
FLAILS
The flails, located inside the housing, may be
reversed when they become dull. It is suggested that
this procedure be performed by your nearest
authorized dealer.
CARBURETOR ADJUSTMENT
A
WARNING: If any adjustments are made
to the engine while the engine is running
(e.g. carburetor), keep ciear of all moving
parts. Be carefui of heated surfaces and
muffler.
Minor carburetor adjustment may be required to com­
pensate for differences in fuel, temperature, altitude
or load.
NOTE: A dirty air cleaner will cause engine to run
rough. Be certain air cleaner is clean and attached to
the carburetor before adjusting carburetor.
Do not make unnecessary adjustments. Factory set­
tings are satisfactory for most applications and condi­
tions. If adjustment is needed, refer to the separate
engine manual packed with your shredder.
OFF-SEASON STORAGE
The following steps should be taken to prepare your
shredder for storage.
1. Clean and lubricate the shredder thoroughly.
2. Refer to engine manual for correct engine storage
instructions.
3. If storing in an unventilated or metal storage
shed, coat metal parts with a light oil or silicone to
prevent rust.
4. Store in a dry, clean area. Do not store next to
corrosive materials, such as fertilizer.
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