Craftsman 247.77012 Operator's Manual page 20

7. Carefully tilt and support the unit up to provide access underneath
to the nozzle mounting hardware and impeller. Remove the three
shoulder bolts securing the black plastic lower flail housing to the
lower housing. Refer to Figure 19.
8. Tilt top of black plastic lower flail housing toward the engine to
remove.
9. Using a 3/16" allen wrench, remove the flat head cap screws that
hold the chipper blade to the impeller. These screws are acces-
sible through the opening created when the chipper chute was
removed earlier. See Figure 20.
10. The nuts on the flat head cap screws can be reached from
underneath using a 1/2-inch socket, universal, and extension.
See Figure 21.
11. Replace or sharpen chipper blade. The blade can be sharpened
with a file or on a grinding wheel.
12. When sharpening blade, protect hands by using gloves and follow
the original angle of grind.
13. Reassemble by performing the previous steps in the opposite
order and manner of removal.
NOTE: Tighten blade screws to 210 - 250 in-lbs. Make certain chipper
blade is reassembled with the sharp edge facing upward.
SERVICE AND MAINTENANCE
Black Plastic
Nozzle
Shoulder Screws
Flat Head Cap Screws
Nuts
0
Figure 19
Chipper Blade
Figure 20
Impeller
Figure 21