Craftsman 247.77635 manual Service and Adjustments, Replacing the Chipper Blades

SERVICE AND ADJUSTMENTS

WARNING: Always stop engine, disconnect spark plug wire and keep away from spark plug, before performing any service or adjustments on your machine.

Disconnecting Spark Plug

WARNING: The muffler and surrounding area will be hot if the engine has been running. Use caution and protect your hands if working near the muffler.

Locate the spark plug wire between the muffler and air cleaner. See Figure 17.

Muffler

Spark Plug Wire

Air Cleaner

Figure 17

Disconnect the spark plug wire by gently pulling the rubber boot from the spark plug. Keep the wire away from spark plug while servicing your chipper shredder to prevent accidental starting of the engine.

Replacing the Chipper Blades

WARNING: The impeller’s chipper blades are sharp. Wear leather work gloves to protect your hands.

•Stop the engine and make certain the chipper shredder has come to a complete stop.

•Disconnect spark plug wire and keep away from spark plug.

•Pivot the shredder screen upward as instructed under the heading Cleaning the Reduction Chamber.

•Remove the chipper chute support brace from the frame by removing the two hex bolts and saddle washers which secure it. See Figure 18.

Chipper Blade	Lock Washer & Nut
Support Brace
	Impeller
Hex Bolts &	Internal
Saddle Washers	Hex Screw

Figure 18

•Remove the chipper chute by removing three hex nuts and washers which secure it to the impeller housing. See Figure 18.

•Rotate the impeller by hand until one of the two chipper blades is visible through the impeller housing opening.

•Remove the blade by removing the internal hex screws, lock washers and hex nuts which secure it to the impeller. Retain the hardware.

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. See Figure 18. Hold the Allen wrench stationary and rotate the box (or socket) wrench to loosen the nut.

•Install a replacement blade (Part No. 742-0544) with the hardware removed earlier.

IMPORTANT: Make certain blades are reassembled with the sharp edge outward (toward the chipper chute). Torque hardware to between 20 ft-lbs and 25 ft-lbs.

•To replace the other blade, rotate the impeller to expose the second blade and repeat the steps above.

Replacing the Shredder Blade

WARNING: The impeller’s chipper blades are sharp. Wear leather work gloves to protect your hands.

•Stop the engine and make certain that all moving parts have come to a complete stop.

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