Craftsman 1450 Series Operator's Manual page 15

SERVICE AND MAINTENANCE
5. Rotate impeller assembly by hand until you locate one of two chipper blades
in the chipper chute opening.
6. Remove the blade by removing the internal hex screws, lock washers, and
hex nuts which secure it to the impeller. Retain the hardware. See Figure 15.
SS
Figure 15
NOTE: Use a 3/16" hex key (Allen) wrench on the outside of the blade and
a 1/2" box (or socket) wrench on the inside of the impeller. Hold the Allen
wrench stationary and rotate the box (or socket) wrench to loosen the nut.
7. Install a replacement blade (Part No. 742-0544) with the hardware
removed earlier or sharpen and replace existing blade.
IMPORTANT: When sharpening the blade, protect hands by using gloves.
Follow the original angle of grind and make sure to remove an equal amount
from each blade.
8. To replace the other blade, rotate the impeller to expose the
second blade and repeat the steps above.
NOTE: Make certain blades are reassembled with the sharp edge facing the
same direction as when removed. Torque hardware to 250 - 300 in. Ibs.
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The impeller's chipper blades and shredder blade are sharp. Wear leather
work gloves to protect your hands.
Sharpening Or Replacing the Shredder Blade
1. Stop the engine and make certain that all moving parts have come to a
complete stop.
2. Disconnect the spark plug wire and ground against the engine.
3, Lower the hopper assembly and place a block under the flail housing.
4, Remove the six hex lock nuts and flat washers from the weld studs on the
flail housing. Retain the hardware.
5. Carefully separate the hopper assembly from the impeller assembly and
remove the shredder plate. The shredder plate can be identified by referring
to item 29 in the parts list on page 20 & 21.
NOTE: When reassembling the shredder plate, make certain the embossed
tab faces inward towards the impeller.
6. Remove the two wing knobs that secure the chute deflector and raise the
chute.
7. Insert a 1/2" or 3/4" diameter pipe through the shredder screen into the
impeller to keep it from turning or remove the flail screen and
insert a piece of wood into the chute opening.
8. A. Remove the two internal hex screws, lock washers, and hex
lock nuts which secure the shredder blade to the impeller.
B. Remove the hex bolt, lock washer, and flat washer to
completely free shredder blade. See Figure 16.
Weld Studs
Flail Housing
XY
Figure 16
9, Install a replacement blade (Part No. 742-0544) with the hardware
removed earlier or sharpen and replace existing blade.
IMPORTANT: When reassembling the shredder blade, tighten center bolt to
between 550 and 700 in.-Ibs. and the two outside bolts to between 250 and 350
in-lbs.
NOTE: Use a 3/16" hex key (Allen) wrench on the outside of the shredder blade and
a 1/2" box (or socket) wrench on the inside of the shredder blade. Hold the Allen
wrench stationary and rotate the box (or socket) wrench to loosen the nut. Use
caution when removing the blade to avoid contacting the weld studs on housing.
IMPORTANT: When sharpening the blade, follow the original angle of grind as a
guide. It is extremely important that each cutting edge receives an equal amount of
grinding to prevent an unbalanced blade. An unbalanced blade will cause excessive
vibration when rotating at high speeds and may cause damage to the unit. The
blade can be tested by balancing it on a screwdriver or nail. Remove metal from the
heavy side until it is balanced evenly.
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