Craftsman 247.775870 owner manual Adjusting Carburetor, Engine Speed

ShreddingBlade

Theshreddingblade 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 20.

Weld Bolt

Allen Screws

Pipe

Blade

Figure 20

•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 discharge chute.

Raise the discharge chute.

•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

_hL 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

equal amount of grinding to prevent an unbalanced blade.

An unbalanced blade willcause excessive vibration when rotatingat high speeds and may cause damage to the unit. The blade can be tested for balance by balancing it on a roundshaft screwdriver or nail. Remove metal from the heavy side until it is balanced evenly. See figure 21.

When reassembling the blade, tighten center bolt to between 550 and 650 inch-pounds and the two outer bolts to between 250 and 350 inch-

pounds, or lacking torque wrench, tighten securely.

I. Insert screw driver through hole

d./

2. Blade should be parallel to ground

Scre_

Driver'_Blade

_1 o' ol--

Ground

Figure 21

ADJUSTING CARBURETOR

WARNING: If any adjustments are made to the engine while the engine is running (e.g.

carburetor),keep clear of all moving parts. Be careful of heated surfaces and muffler.

The carburetor has been pre-set at the factory and should not require adjustment. However, if your engine does not operate properly due to suspected carburetor problems, take your chipper-shredder to your nearest SEARS service center.

ENGINE SPEED

The engine speed on your chipper-shredder has been set at the factory. Do not attempt to increase engine speed or it may result in personal injury. If you believe the engine is running too fast or too slow, take your chipper-shredder to the nearest SEARS service center for repair and adjustment.

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