MTD 645B thru 651B - Manual (Page 9)

N.
•N
NOTE: When reassembling, make certain the open­
ing on the back-up plate is toward the bottom of the
unit. The back-up piate may be reversed to provide a
new cutting edge.
Allen
Screws
Torque
Wrench
Blade
FIGURE 16.
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 impeller assembly to keep it from
turning, or remove the flail screen, and insert a
piece of wood (2 x 4) into the chute opening.
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 center 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 original angle
of grind as a guide. It is extremely important that each
cutting edge receives an equal amount of grinding to
prevent an unbalanced blade. An unbalanced blade
will cause excessive vibration when rotating 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. Remove 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 author­
ized dealer.
CARBURETOR ADJUSTMENT
A WARNING: If any adjustments are made
to the engine while the engine is running
(e.g. carburetor), keep ciear of ail moving
parts. Be careful 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 CARBURE­
TOR.
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 as
described in the lubrication instructions.
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.