Craftsman 247.77013.0 - Manual (Page 20)

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SERVICE AND MAINTENANCE
Remove the four screws on the upper housing that secure the
nozzle cover. See Figure 24.
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 25.
Tilt top of black plastic lower flail housing toward the engine to
remove.
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 26.
The nuts on the flat head cap screws can be reached from
underneath using a 1/2-inch socket, universal, and extension.
See Figure 27.
Replace or sharpen chipper blade. The blade can be sharpened
with a file or on a grinding wheel.
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.
6.
7.
8.
9.
10.
11.
12.
Figure 25
Figure 26 Figure 27
Flat Head Cap Screws
Chipper Blade
Nuts
Impeller
Black Plastic
Nozzle
Shoulder Screws
Figure 24
Warning
The chipper blade is sharp. When sharpening blade, wear leather
work gloves to protect your hands and follow the original angle of
grind.