Craftsman 247.7701 - Manual (Page 13)

13
SHARPENING OR REPLACING CHIPPER
BLADE
Because the engine on this unit has a tapered
crankshaft, a special impeller removal tool (part
number 753-0638) is required to remove the impeller
assembly. For further assistance, contact your Sears
Service Center.
NOTE: When tipping the unit, empty the fuel tank and
keep engine spark plug side up.
• Disconnect and ground the spark plug wire.
• Remove the front hubcaps, shoulder screws,
wave washers, and bell washers that attach to
the front wheels. See Figure 14.
• Remove the shoulder screws that go through the
pivot arms and height bracket adjusters to the
front support brace.
Figure 14
• Remove the three screws on the upper housing
that secure the nozzle cover and the nine screws
that secure the lower housing to the upper
housing. See Figure 15.
Figure 15
• Remove lock nut that secures flail screen to the
lower housing. The flail screen does not have to
be removed. Refer to Figure 12.
• Remove the hex bolt, lock washer, and flat
washer that secure the impeller assembly to the
crankshaft. See Figure 16.
Figure 16
• Apply lubricant to the threads of impeller removal
tool and then thread the tool into the crankshaft.
Stop when the impeller assembly can move on
the crankshaft.
• Remove the impeller assembly from the
crankshaft. Unthread the impeller removal tool
from the impeller assembly.
• Remove the chipper blade using a 3/16" allen
wrench on the outside of the blade and 1/2"
wrench on the underside of impeller assembly.
• Replace or sharpen chipper blade.
• When sharpening blade, protect hands by using
gloves and follow the original angle of grind.
• Reassemble by performing the previous steps in
reverse order.
• Tighten blade screws to 210 - 250 in-lbs.
• Tighten impeller bolt to 375 - 425 in-lbs.
NOTE: Make certain chipper blade is reassembled
with the sharp edge facing upward. See Figure 17.
Figure 17
Hubcap
Shoulder
Screw
Wave Washer
Shoulder
Screw
Height
Bracket
Adjuster
Bell
Washer
Pivot
Arm
Lower
Housing
Screws
Nozzle
Screws
Upper
Housing
Impeller
Assembly
Hex Bolt
Lock Washer
Flat Washer
BOTTOM VIEW
Chipper
Blade
Flail
Blade
Flail
Blade
Chipper
Blade
Impeller
Assembly