Sears 770-7387F 247.78089 - Manual (Page 13)

SERVICE & ADJUSTMENT
A
WARNING: ALWAYS STOP ENGINE AND
DISCONNECT SPARK PLUG WIRE AND
MOVE IT AWAY FROM SPARK PLUG BE­
FORE PERFORMING ANY ADJUST­
MENTS OR REPAIRS.
REMOVING THE FLAIL SCREEN
If the discharge area becomes clogged, remove the flail
screen and clean area as follo\ws.
• Stop the engine, make certain the chipper-shredder
has come to a complete stop and disconnect spark
plug wire from the spark plug before unclogging the
chute.
• Loosen the two hand knobs on each side of the
chute deflector. Lift the chute deflector up, and tie
it out of the way.
• Remove two hairpin clips from the clevis pins which
extend through the housing. Remove the clevis pins.
Lift the flail screen from inside the housing. See
figure 18.
• Clean the screen by scraping or washing with water.
Reinstall the screen.
NOTE: Be certain to reassemble the flail screen with
the curved side down as shown in figure 18.
Chute Deflector
Hand Knobs
FIGURE 18.
SHARPENING OR REPLACING THE BLADES
CHIPPER BLADES
• Disconnect spark plug wire and move it away from
spark plug.
• Remove the flail screen as instructed in previous
section.
• Remove the chipper chute by removing three hex
nuts and washers. A 1/2" wrench is required. See
figure 18.
NOTE: When reassembling, the cupped washer goes
on the bottom of the chipper chute with the cupped side
against the chute.
• Rotate the impeller assembly by hand until you
locate one of the chipper blades in the chipper chute
opening. Remove the blade, using a 3/16" alien
wrench on the outside of the blade and 1/2" wrench
on the impeller assembly (inside the housing). See
figure 19.
• Remove the other blade in the same manner.
FIGURE 19.
Replace or sharpen blades. If sharpening, make cer­
tain to remove an equal amount from each blade.
Reassemble in reverse order.
Make certain blades are reassembled with the sharp
edge facing the direction shown in figure 19 (sharp
edge is assembled toward the slotted opening in the
impeller assembly).
SHREDDING BLADE
The shredding blade may be removed for sharpening
or replacement as follows.
• Lower the hopper assembly. Block up the housing.
See figure 20.
• Remove the four hex lock nuts and lock washers
from the housing weld bolts using a 1/2" wrench.
Separate the chipper-shredder into two halves.
• Remove the back-up plate.
NOTE: When reassembling, make certain the opening
on the back-up plate is toward the bottom of the unit.
The back-up plate may be reversed to provide a new
cutting edge.
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