Craftsman 247.770330 Operator's Manual page 19

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 29.
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 accessible through the
opening created when the chipper chute was removed earlier. See Figure 30.
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 31.
11. Replace or sharpen chipper blade. The blade can be sharpened with a file or
on a grinding wheel.
The chipper blade is sharp. When sharpening blade, wear leather work
gloves to protect your hands and follow the original angle of grind.
12. 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.
Black
Plastic
Nozzle
Shoulder Screws
SERVICE AND MAINTENANCE
WARNING
Figure 29
Flat Head Cap Screws
Nuts
19
Chipper Blade
Figure 30
Impeller
Figure 31