Craftsman 247.77586 Sharpening Or Replacing The Blades, Chipper Blades, Shredding Blade, Figure

2.SHARPENING OR REPLACING THE BLADES

Chipper Blades

Disconnect spark plug wire and move it away

from spark plug.

Remove the flail screen as instructed in previous section.

Using a 1/2" wrench, remove the chipper chute by removing three hex nuts and washers. See figure 17.

Using a 7/16" wrench, remove the brace (holding the chute to the frame) by removing the hex bolts.

NOTE: When re-assembling, the cupped washer goes on the slot toward the bottom of the chipper chute with the cupped side against the chute.

Rotate the impeller assembly by hand until you locate one of the two chipper blades in the chipper chute opening. Remove the blade, using a 3/16" allen wrench on the outside of the blade and 1/2" wrench on the impeller assembly (inside the housing). See figure 18.

Sharp Edge

Figure 18

Remove the other blade in the same manner. Replace or sharpen blades.

oIf sharpening, make certain to remove an equal amount from each blade.

Reassemble in reverse order. Make certain

blades are reassembled with the sharp edge facing the direction shown in figure 18 (sharp edge is assembled toward the slotted opening at the bottom).

Torque bolts and nuts to 250-350 inch-pounds.

Shredding Blade

The shredding blade may be removed for sharpening or replacement as follows.

•Disconnect spark plug wire and move it away from spark plug.

•Lower the hopper assembly. Block up the housing. See figure 19.

Allen

Screws

f

Pipe

Blade

Wrench

Figure 19

•Remove the six hex lock nuts and lock washers

from the housing weld bolts using a 1/2" wrench. Separate the chipper-shredder into two halves.

•Remove the back-up plate.

NOTE: When reassembling, make certain the embossed tab faces inward towards the impeller, and opening on the back-up plate is toward the bottom of the unit.

Remove the two hand knobs and cupped washers which secure the chute deflector. Raise the chute deflector.

Insert a 1/2" or 3/4" diameter pipe through the flail screen into the impeller to keep it from turning, or remove the flail screen and insert a piece of wood (2 x 4) into the chute opening. Remove the two outside screws on the blade, using a 3/16" allen wrench and a 1/2" wrench.

Remove the blade by removing the center bolt, lock washer and flat washer.

the blade to avoid contacting the weld bolts

_ WARNING: Use caution when removing on the housing.

When sharpening the blade, follow the original angle of grind as a guide. It is extremely important that each cutting edge receives an

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