Sears Craftsman Chipper-Shredder Owner's Manual

Safety Rules

WARNING: TO REDUCE THE POTENTIAL FOR ANY INJURY, COMPLY WITH THE FOLLOWING SAFETY INSTRUCTIONS. FAILURE TO COMPLY WITH THE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

Training

• Read this owner's manual carefully in its entirety before attempting to assemble or operate this machine. Be completely familiar with the controls and the proper use of this machine before operating it. Keep this manual in a safe place for future and regular reference and for ordering replacement parts.
• Children must never be allowed to operate this equipment.
• No one should operate this unit while intoxicated or while taking medication that impairs the senses or reactions.
• This equipment should never be operated in the vicinity of children, pets or other persons.
• Never run your machine in an enclosed area as the exhaust from the engine contains carbon monoxide, which is an odorless, tasteless and deadly poisonous gas.
• Never place your hands or any part of your body or clothing inside the feeding chamber, discharge chute, or near any moving part while the machine or engine is running.
• If it is necessary for any reason to inspect or repair the feeding chamber or any part of the machine where a moving part can come in contact with your body or clothing, stop the machine, allow it to cool, disconnect the spark plug wire from the spark plug and move it away from the spark plug before attempting such inspection or repair.

Preparation

• Wear safety glasses provided with your unit while operating the chipper-shredder to prevent injury from any material which may be ejected out of the openings.
• Wear proper apparel. Avoid wearing loose fitting clothing. Wear gloves when handling material.
• HANDLE GASOLINE WITH CARE as it is an extremely flammable fuel.
• Check the fuel before starting the engine. Do not fill the fuel tank indoors, while the engine is running, or while the engine is still hot. Turn the unit off and let the engine cool before refueling.
• Fuel your chipper-shredder in a clean area. Do not smoke while refueling.
• Fuel tank cap must be secure at all times except during refueling.
• Avoid spilling gasoline or oil. Wipe the unit clean of any spilled fuel or oil.
• Store fuel and oil in approved containers, away from heat or open flame, and out of reach of children.
• This machine should be operated only upon a level surface.
• Assure that all screws, nuts and bolts and other fasteners are properly secured.

Operation

• When feeding shreddable material into this equipment, be extremely careful that pieces of metal, rocks, bottles, cans or other foreign objects are not included. Personal injury or damage to the machine could result.
• If the cutting mechanism strikes any foreign object or if your machine should start making an unusual noise or vibration, immediately stop the engine, disconnect the spark plug wire from the spark plug and move it away from the spark plug. Allow the machine to stop and take the following steps: Inspect for damage. Replace or repair any damaged parts. Check for any loose parts and tighten to assure continued safe operation.
• The engine must be kept clean of debris and other accumulations.
• Do not allow an accumulation of processed material to build up in the discharge area as this will prevent proper discharge and can result in kick-back from feed opening.
• Never place your hands or any other part of your body or clothing inside the feeding chamber, discharge chute or near any moving part while the engine is running.
• Keep all guards and deflectors in place and in good working condition to assure continued safe operation.
• Always stand clear of the discharge area when operating this machine.
• Keep your face and body back from the feed opening to avoid accidental bounce back of any material.
• Do not over-reach. Keep proper balance and footing at all times.
• The engine governor settings on your machine must not be altered, changed, or tampered with. The governor controls the maximum safe operating speeds and protects the engine and all moving parts from damage caused by overspeed.
• Do not transport machine while engine is running.
• Do not operate engine if air cleaner or cover directly over carburetor air intake is removed, except for adjustment. Removal of such parts could create a fire hazard.

Maintenance and Storage

• When this equipment is stopped for servicing, inspection, storage or to change an accessory, make sure the spark plug wire is disconnected from the spark plug and moved away from the spark plug. The machine should be allowed to cool down before making such inspection, adjustments, service, etc. Maintain your machine with care and keep it clean for the best and continued safe operation.
• Do not use flammable solutions to clean the air filter.
• When not in use, your machine should be stored out of the reach of children. Keep where gasoline fumes will not reach an open flame or spark. For long periods of storage, refer to the "Storage" section of this manual.

[IMPORTANT SAFETY PRECAUTIONS SYMBOL]: ATTENTION!!! BECOME ALERT!!! YOUR SAFETY IS INVOLVED.

Product Specifications

Maintenance Agreement

A Sears Maintenance Agreement is available on this product. Contact your nearest Sears store for details.

WARNING: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-covered, brush-covered or grass-covered land unless the engine's exhaust system is equipped with a spark arrester meeting applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator. In the State of California, the above is required by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest Sears Authorized Service Center (See the REPAIR PARTS section of this manual.)

Warranty

One Year Limited Warranty on Craftsman Gas Chipper-Shredder

For one year from the date of purchase, when this Craftsman Chipper-Shredder is maintained, lubricated and tuned up according to the instructions in the owner's manual, Sears will repair, free of charge, any defect in material and workmanship.

If this Craftsman Chipper-Shredder is used for commercial or rental purposes, this warranty applies for only 30 days from the date of purchase.

This warranty does not cover:

• Expendable items which become worn during normal use, such as blades, chipper blades, flails, air cleaners, spark plugs and catcher bags.
• Repairs necessary because of operator abuse or negligence, including bent crankshafts and the failure to maintain the equipment according to the instructions contained in the owner's manual.

WARRANTY SERVICE IS AVAILABLE BY RETURNING THE CRAFTSMAN CHIPPER-SHREDDER TO THE NEAREST SEARS SERVICE CENTER/DEPARTMENT IN THE UNITED STATES. THIS WARRANTY APPLIES ONLY WHILE THIS PRODUCT IS IN USE IN THE UNITED STATES.

This warranty gives you specific legal rights, and you may also have other rights which may vary from state to state.

SEARS, ROEBUCK AND CO., D/817WA, Hoffman Estates, IL 60195

Assembly Instructions

IMPORTANT: This unit is shipped WITHOUT GASOLINE or OIL. After assembly, see operation section of this manual for proper fuel and engine oil recommendations.

NOTE: To determine right and left hand sides of your chipper-shredder, stand behind and face the hopper (engine is at the front of the unit).

Your chipper-shredder has been completely assembled at the factory, except for the hopper assembly (hopper hood and upper leaf ramp section have been sub-assembled), upper guide assembly, chute deflector and the catcher bag. The hardware pack and safety glasses are also included in the carton. The hardware pack contains the parts shown in figure 1 (shown full size).

TO REMOVE CHIPPER-SHREDDER FROM CARTON: Cut the corners of the carton. Remove all packing inserts. Roll chipper-shredder out of the carton. Make certain all parts and literature have been removed before the carton is discarded.

Tools Required for Assembly:

• (1) Phillips Screwdriver
• (2) 1/2" or Adjustable Wrenches
• (2) 7/16" or Adjustable Wrenches

Figure 1 Description: Shows hardware including a long hex bolt (5/16-18 x 8-3/8"), hex lock nut (5/16-18 thread), flat washer (5/16" I.D.), truss machine screws (1/4-20 x 1/2" Long), and hex lock nuts (1/4-20 Thread).

How to Set Up Your Chipper-Shredder

[IMPORTANT SAFETY NOTE]: MAKE CERTAIN THE SPARK PLUG WIRE IS DISCONNECTED AND MOVED AWAY FROM THE SPARK PLUG BEFORE ASSEMBLING THE CHIPPER-SHREDDER.

Attaching the Chute Deflector

• Remove the hand knobs and cupped washers from each side of the discharge opening on the left side of the chipper-shredder.
• Remove hex lock nut, two spacers and hex bolt from inside the hinge on top of the housing assembly. Do not remove one spacer from the hex bolt.
• Place the chute deflector in position on the discharge opening. Insert hex bolt and spacer through hinge on chute deflector and housing (spacer fits inside of hinge). See figure 2.
• Place second spacer over hex bolt, inside other part of hinge. Secure with hex lock nut. Tighten securely.
• Secure both sides of chute deflector to housing using hand knobs and cupped washers (cupped side of washers go against chute deflector).

Figure 2 Description: Illustrates the attachment of the chute deflector using a hex bolt, spacers, hex lock nut, hand knobs, and cupped washers, connecting to the housing assembly and frame.

Attaching the Upper Guide Assembly

• Place upper guide assembly in position on frame, making certain edges of the upper guide assembly are underneath stop washers, and the release bar is in the slots. See figure 3.
• Insert hex bolt 8-3/8" long through upper guide assembly and frame. Secure with flat washer and hex lock nut.
• NOTE: Make certain upper guide assembly can pivot by pulling up on release bar and lowering upper guide assembly. If necessary, loosen hex lock nut a turn or two. Put the upper guide assembly back into the raised position.

Figure 3 Description: Shows the frame, stop washer, upper guide assembly, hex bolt, flat washer, hex lock nut, release bar, and hand knob, illustrating the connection of the upper guide assembly to the frame.

Attaching the Hopper Assembly

• Your chipper-shredder has been shipped with the upper leaf ramp section attached to the hopper assembly. See figure 4.
• Attach the hopper assembly to the upper guide assembly as follows. Be certain to place heads of all truss machine screws inside of hopper assembly.
• Remove one truss machine screw and nut from each side of hopper assembly as shown in figure 4. Push hopper pivot door down inside lower part of hopper as you place hopper assembly (both pieces) inside upper guide assembly. Replace truss screws and nuts just removed, using the hole shown in figure 4, one on each side. Tighten finger tight only.
• Place the six truss machine screws and nuts found in hardware pack in the remaining holes of hopper assembly, alternating sides of the unit and tightening finger tight only.
• After assembling all eight screws, tighten them securely.

Figure 4 Description: Depicts the hopper assembly, hopper pivot door, upper guide assembly, truss screws, and nuts, showing the assembly process for attaching the hopper.

Attaching the Catcher Bag

• Your chipper-shredder is equipped with a catcher bag to catch the shredded material.
• To attach the bag, place the opening of the bag over the chute deflector so it completely covers the chute opening. Depress the plunger on the drawstring, and pull on the drawstring until the bag is tight around the chute opening. Release plunger to lock it into position. See figure 5.

Figure 5 Description: Shows the catcher bag, drawstring, and plunger, illustrating how to attach the bag to the chute opening.

Operation

Know Your Chipper-Shredder

READ THIS OWNER'S MANUAL AND SAFETY RULES BEFORE OPERATING YOUR CHIPPER-SHREDDER. Compare the illustrations with your chipper-shredder to familiarize yourself with the location of various controls and adjustments. Save this manual for future reference.

Figure 6 Description: Shows a diagram of the chipper-shredder (Model 247.795861) with controls labeled: Hopper Assembly, Chipper Chute, Oil Fill, Dipstick, Fuel Tank, Release Bar, Engine Shut-Off Switch, Spark Plug, Choke Lever, Starter Handle, Chute Deflector, and Catcher Bag.

Sears chipper-shredders conform to the safety standard B71.6-1982 of the American National Standards Institute.

Operating Controls (See figure 6)

• RELEASE BAR: Used to release the hopper when raising or lowering.
• CHOKE LEVER: Used to enrich the fuel mixture in the carburetor when starting a cold engine.
• STARTER HANDLE: Used to manually start the engine.
• ENGINE SHUT-OFF SWITCH: Used to stop the engine.
• FUEL SHUT-OFF VALVE: Used to stop the flow of fuel into the carburetor (located beneath the fuel tank).

BEFORE USING YOUR CHIPPER-SHREDDER, AGAIN REFER TO THE "SAFETY RULES" AS SHOWN ON PAGE 2 OF THIS MANUAL. ALWAYS BE CAREFUL.

[WEAR SAFETY GLASSES SYMBOL]: FORESIGHT IS BETTER THAN NO SIGHT.

The operation of any chipper-shredder can result in foreign objects being thrown into the eyes, which can result in severe eye damage. Always wear the safety glasses provided with the chipper-shredder or eye shields before chipping or shredding, or while performing any adjustments or repairs. We recommend Wide Vision Safety Mask for over spectacles or standard glasses available at Sears Retail or Catalog Stores.

To Stop Engine

• Move engine shut-off switch to OFF position. See figure 6.
• Disconnect spark plug wire and move away from spark plug to prevent accidental starting while equipment is unattended.
• Close fuel shut-off valve when equipment is not in use to prevent fuel leakage.

How to Use Your Chipper-Shredder

Do not attempt to shred or chip any material other than vegetation found in a normal yard (i.e., branches, leaves, twigs, etc.).

WARNING: THE CHIPPER-SHREDDER DISCHARGES MATERIALS WITH CONSIDERABLE VELOCITY. KEEP AWAY FROM THE AREA AROUND THE CHUTE DEFLECTOR. ALWAYS STOP THE ENGINE AND DISCONNECT THE SPARK PLUG WIRE WHEN REMOVING OR ATTACHING THE BAG, WHEN CHANGING CONTAINERS, OR WHEN REMOVING THE SHREDDED MATERIAL. WEAR SAFETY GLASSES AND GLOVES WHENEVER USING YOUR CHIPPER-SHREDDER.

The chipper-shredder is designed for three different methods of operation.

• Leaves and small branches up to 1/2" diameter (recommended) or 1" diameter (maximum) can be fed into the hopper assembly when it is in the raised position. See figure 7. If it becomes necessary to push material into the chipper-shredder, use a small diameter stick—NOT YOUR HANDS. The stick should be small enough that it will be ground up if it gets into the impeller assembly.
• WARNING: DO NOT PUT MATERIAL LARGER THAN 1/2" IN DIAMETER (RECOMMENDED) or 1" DIAMETER (MAXIMUM) INTO THE HOPPER ASSEMBLY. MATERIAL UP TO A MAXIMUM OF 3" IN DIAMETER MATERIAL MAY BE FED INTO THE CHIPPER CHUTE. DO NOT ATTEMPT TO SHRED OR CHIP ANY MATERIAL LARGER THAN 3" IN DIAMETER. PERSONAL INJURY OR DAMAGE TO THE MACHINE COULD RESULT.

Figure 7 Description: Shows the hopper assembly with a diagram indicating material size limits for the raised hopper: No Larger Than 1/2" Diameter (Recommended) Or 1" Diameter (Maximum).

• Leaves and small twigs can be raked into the hopper assembly when the hopper assembly is lowered to the ground. See figure 8.
• Small branches up to 1/2" diameter (recommended) or 1" diameter (maximum) can also be fed into the hopper assembly in this position. See figure 9.

Figure 8 Description: Shows the hopper assembly lowered to the ground, suitable for raking in leaves and small twigs.

Figure 9 Description: Shows the hopper assembly in a lowered position, indicating material size limits for branches: No Larger Than 1/2" Diameter (Recommended) Or 1" Diameter (Maximum).

• To lower the hopper assembly, use one hand to grasp the handle at the top of the hopper assembly and lift slightly. Pull up on the release bar, and lower the hopper assembly to the ground. Release the bar. See figure 10.
• Bulky material, such as stalks or heavy branches, up to 3" in diameter, should be fed into the chipper chute. See figure 11.
• WARNING: MAKE CERTAIN THE CHIPPER CHUTE DOOR IS CLOSED WHEN NOT IN USE.

Figure 10 Description: Illustrates lowering the hopper assembly by lifting the release bar and lowering the hopper.

Figure 11 Description: Shows the chipper chute with a 3" maximum diameter limit for feeding bulky material. Also indicates the Oil Fill, Dipstick, Oil Drain, and the Chipper Chute.

IMPORTANT: There is a flail screen located inside the housing in the discharge area. If the flail screen becomes clogged, remove and clean as instructed in the Service and Adjustments section. For best performance, it is important to keep the shredding blade and the chipper blades sharp. If the composition of the material being discharged changes (becomes stringy, etc.) or if the rate at which the material is discharged slows down considerably, it is likely that the shredding blade and/or chipper blades are dull and need to be sharpened or replaced. Refer to Service and Adjustments section.

Gas and Oil Fill-Up

Oil

Only use high quality detergent oil rated with API service classification SG. Select the oil's viscosity grade according to your expected operating temperature.

Temperature Guide: Colder 32°F ➡️ Warmer (Showing 5W30 and SAE 30 oil grades).

NOTE: Although multi-viscosity oils (5W30, 10W30, etc.) improve starting in cold weather, these multi-viscosity oils will result in increased oil consumption when used above 32°F. Check your oil level more frequently to avoid possible engine damage from running low on oil.

Your four-cycle engine will normally consume some oil—therefore, check engine oil level regularly approximately every five hours of operation and before each usage. Stop engine and wait several minutes before checking oil level. With engine level, the oil must be to FULL mark on dipstick (refer to figure 12). Change engine oil after the first five hours of operation, and every twenty-five hours thereafter.

To Drain Oil:

• Drain oil while engine is warm.
• a. Remove oil drain plug. Refer to figure 11. Catch oil in a suitable container.
• b. When engine is drained of all oil, replace drain plug securely.
• Refill with fresh oil. Refer to GAS AND OIL FILL-UP section.
• Replace dipstick.

Figure 12 Description: Shows oil fill and dipstick locations for Model 247.795860 and Model 247.795861.

Gas

• Remove fuel cap and fill fuel tank with about 1 gallon of clean, fresh, lead-free grade automotive gasoline. DO NOT use Ethyl or high octane gasoline. Be certain container is clean and free from rust or foreign particles. Never use gasoline that may be stale from long periods of storage in the container. Replace fuel cap.
• WARNING: DO NOT FILL CLOSER THAN 1/2 INCH OF TOP OF FUEL TANK TO PREVENT SPILLS AND TO ALLOW FOR FUEL EXPANSION. IF GASOLINE IS ACCIDENTLY SPILLED, MOVE CHIPPER-SHREDDER AWAY FROM AREA OF SPILL. AVOID CREATING ANY SOURCE OF IGNITION UNTIL GASOLINE VAPORS HAVE DISAPPEARED.

To Start Engine

WARNING: BE SURE NO ONE OTHER THAN THE OPERATOR IS STANDING NEAR THE CHIPPER-SHREDDER WHILE STARTING OR OPERATING. DO NOT OPERATE THIS CHIPPER-SHREDDER UNLESS THE CHUTE DEFLECTOR HAS BEEN PROPERLY INSTALLED AND IS SECURED WITH THE HAND KNOBS.

• Check the fuel level periodically to avoid running out of gasoline while operating the chipper-shredder. If the unit runs out of gas as it is shredding or chipping, it may be necessary to unclog the unit before it can be restarted. Refer to "Removing the Flail Screen" in SERVICE AND ADJUSTMENT section.
• WARNING: EXPERIENCE INDICATES THAT ALCOHOL BLENDED FUELS (CALLED GASOHOL OR USING ETHANOL OR METHANOL) CAN ATTRACT MOISTURE WHICH LEADS TO SEPARATION AND FORMATION OF ACIDS DURING STORAGE. ACIDIC GAS CAN DAMAGE THE FUEL SYSTEM OF AN ENGINE WHILE IN STORAGE. TO AVOID ENGINE PROBLEMS, THE FUEL SYSTEM SHOULD BE EMPTIED OR TREATED WITH FUEL STABILIZER BEFORE STORAGE FOR 30 DAYS OR LONGER. USE FRESH FUEL NEXT SEASON. SEE "STORAGE" SECTION FOR ADDITIONAL INFORMATION.
• NEVER USE ENGINE OR CARBURETOR CLEANER PRODUCTS IN THE FUEL TANK OR PERMANENT DAMAGE MAY OCCUR.
• Attach spark plug wire and rubber boot to spark plug if necessary. See figure 13.
• Open fuel shut-off valve by turning in direction of arrow several turns. See figure 14.
• Move choke lever down to CHOKE position.
• Place the engine shut-off switch in ON position. See figure 14.
• Grasp starter handle (see figure 13) and pull rope out slowly until engine reaches start of compression cycle (rope will pull slightly harder at this point). Let the rope rewind slowly.
• NOTE: A noise will be heard when finding the start of the compression cycle. This noise is caused by the flails and fingers which are part of the shredding mechanism falling into place, and should be expected. In addition, the flails and fingers will be noisy after the engine is started, until the impeller reaches full speed.
• Pull rope with a rapid, continuous, full arm stroke. Keep a firm grip on start handle. Let rope rewind slowly. Do not let starter handle snap back against starter.
• Repeat preceding two instructions until engine fires. When engine starts, move choke lever on engine halfway between CHOKE and RUN.
• NOTE: If engine does not fire after three attempts, move choke lever halfway between CHOKE and RUN position and try again. See figure 14.

Figure 13 Description: Shows the engine components: Spark Plug, Wire and Boot, Muffler, Fuel Tank, Starter Handle, Oil Fill, and Dipstick.

Figure 14 Description: Illustrates control positions: Fuel Shut-Off Valve (To Open/Closed), Choke Lever (To Choke/Run), and Engine Shut-Off Switch (ON/OFF).

To Stop Engine

• Move engine shut-off switch to OFF position. See figure 14.
• Disconnect spark plug wire and move away from spark plug to prevent accidental starting while equipment is unattended.
• Close fuel shut-off valve when equipment is not in use to prevent fuel leakage.

Customer Responsibilities

Maintenance Schedule

FILL IN DATES AS YOU COMPLETE REGULAR SERVICE

✔️ CHECK

General Recommendations

WARNING: ALWAYS STOP THE ENGINE AND DISCONNECT THE SPARK PLUG WIRE BEFORE PERFORMING ANY MAINTENANCE OR ADJUSTMENTS.

• Periodically check all fasteners and be sure they are tight.
• Follow the Maintenance Schedule above.

Chipper-Shredder Lubrication

Lubricate the pivot points on the release bar, hopper assembly, chute deflector and chipper chute once a season using a light oil.

Engine Oil

Only use high quality detergent oil rated with API service classification SG. Select the oil's viscosity grade according to your expected operating temperature.

Temperature Guide: Colder 32°F ➡️ Warmer (Showing 5W30 and SAE 30 oil grades).

NOTE: Although multi-viscosity oils (SE30, 10W30, etc.) improve starting in cold weather, these multi-viscosity oils will result in increased oil consumption when used above 32°F. Check your oil level more frequently to avoid possible engine damage from running low on oil.

Your four-cycle engine will normally consume some oil—therefore, check engine oil level regularly approximately every five hours of operation and before each usage. Stop engine and wait several minutes before checking oil level. With engine level, the oil must be to FULL mark on dipstick (refer to figure 12). Change engine oil after the first five hours of operation, and every twenty-five hours thereafter.

To Drain Oil:

• Drain oil while engine is warm.
• a. Remove oil drain plug. Refer to figure 11. Catch oil in a suitable container.
• b. When engine is drained of all oil, replace drain plug securely.
• Refill with fresh oil. Refer to GAS AND OIL FILL-UP section.
• Replace dipstick.

Maintenance Details

Air Cleaner

The air cleaner prevents damaging dirt, dust, etc., from entering the carburetor and being forced into the engine and is important to engine life and performance.

Never run your engine without air cleaner completely assembled.

To Service Air Cleaner:

• Service pre-cleaner after every 25 hours of use, or at least once a season. Service cartridge every 100 hours of use, or at least once a season. Service pre-cleaner and cartridge more often under dusty conditions.
• Remove wing nut and cover.
• To service foam pre-cleaner: Remove pre-cleaner by sliding it off the cartridge. Wash in liquid detergent and water. Squeeze dry in a clean cloth. Saturate in engine oil. Squeeze in a clean, absorbent cloth to remove all excess oil. If pre-cleaner is very dirty, replace it.
• To service cartridge: Remove cartridge by removing wing nut and lifting off cup and cartridge. Clean by tapping gently on a flat surface. If very dirty, replace. Do not oil cartridge.
• NOTE: Do not use petroleum solvents (e.g. kerosene) or pressurized air to clean cartridge. They will cause cartridge to deteriorate.
• Reinstall cartridge, cup, pre-cleaner and cover.
• Fasten wing nuts securely.

Figure 15 Description: Shows the parts of the air cleaner: Wing Nut (Upper), Cover, Foam Pre-Cleaner, Wing Nut, Cup, and Cartridge.

Fuel Filter

Your engine is equipped with a replaceable in-line fuel filter. Replace the fuel filter every season. See figure 16. Refer to engine parts list for correct replacement filter.

Figure 16 Description: Shows an in-line fuel filter.

Clean Engine

Clean engine periodically. Remove dirt and debris with a cloth or brush. Cleaning with a forceful spray of water is not recommended as water could contaminate the fuel system.

Yearly or every 25 hours, whichever occurs first, remove the blower housing and clean the areas shown in figure 17 to avoid overspeeding, overheating and engine damage. Clean more often if necessary.

WARNING: PERIODICALLY CLEAN MUFFLER AREA TO REMOVE ALL GRASS, DIRT AND COMBUSTIBLE DEBRIS.

Figure 17 Description: Shows the engine area to clean, highlighting "Clean Out Chaff and Dirt".

Leaning

The chipper-shredder may be cleaned by running water from a hose through the hopper assembly and chipper chute with the engine running. Allow the chipper-shredder to dry thoroughly.

Wash the bag periodically with water. Allow to dry thoroughly in the shade. Do not use heat.

Spark Plug

The spark plug should be cleaned and the gap reset to 0.030" at least once a season or every 50 hours of operation. See figure 18. Spark plug replacement is recommended at the start of each season. Refer to engine parts list for correct spark plug type.

NOTE: Do not sandblast spark plug. Spark plug should be cleaned by scraping or wire brushing and washing with a commercial solvent.

Figure 18 Description: Shows a spark plug with a 0.030" Feeler Gauge indicating the correct gap.

Muffler

Do not operate the chipper-shredder without a muffler or tamper with the exhaust system. Damaged mufflers or spark arresters could create a fire hazard. Inspect periodically, and replace if necessary. If your engine is equipped with a spark arrester screen assembly, remove every 50 hours for cleaning and inspection. Replace if damaged.

Storage

Prepare your chipper-shredder for storage at the end of the season or if the unit will not be used for 30 days or more.

WARNING: NEVER STORE MACHINE WITH FUEL IN THE FUEL TANK INSIDE OF BUILDING WHERE FUMES MAY REACH AN OPEN FLAME OR SPARK, OR WHERE IGNITION SOURCES ARE PRESENT SUCH AS HOT WATER AND SPACE HEATERS, FURNACES, CLOTHES DRYERS, STOVES, ELECTRIC MOTORS, ETC.

NOTE: A yearly check-up by your local Sears Service Center is a good way to make certain your chipper-shredder will provide maximum performance for the next season.

Chipper-Shredder Storage

• Clean the chipper-shredder thoroughly.
• Wipe unit with an oiled rag to prevent rust (use a light oil or silicone).

Engine Storage

IMPORTANT: IT IS IMPORTANT TO PREVENT GUM DEPOSITS FROM FORMING IN ESSENTIAL FUEL SYSTEM PARTS SUCH AS CARBURETOR, FUEL FILTER, FUEL HOSE, OR TANK DURING STORAGE. ALSO, EXPERIENCE INDICATES THAT ALCOHOL BLENDED FUELS (CALLED GASOHOL OR USING ETHANOL OR METHANOL) CAN ATTRACT MOISTURE WHICH LEADS TO SEPARATION AND FORMATION OF ACIDS DURING STORAGE. ACIDIC GAS CAN DAMAGE THE FUEL SYSTEM OF AN ENGINE WHILE IN STORAGE.

• Drain the fuel tank.
• Start the engine and let it run until the fuel lines and carburetor are empty.
• Never use engine or carburetor cleaner products in the fuel tank or permanent damage may occur.
• Use fresh fuel next season.
• NOTE: Fuel stabilizer is an acceptable alternative in minimizing the formation of fuel gum deposits during storage. Add stabilizer to gasoline in fuel tank or storage container. Always follow the mix ratio found on stabilizer container. Run engine at least 10 minutes after adding stabilizer to allow the stabilizer to reach the carburetor. Do not drain the gas tank and carburetor if using fuel stabilizer.
• Drain all the oil from the crankcase (this should be done after the engine has been operated and is still warm) and refill the crankcase with fresh oil.
• If you have drained the fuel tank, protect the inside of the engine as follows: Remove spark plug, pour approximately 1/2 ounce (approximately one tablespoon) of engine oil into cylinder and crank slowly to distribute oil. Replace spark plug.

Other Storage Considerations

• Do not store gasoline from one season to another.
• Replace your gasoline can if your can starts to rust. Rust and/or dirt in your gasoline will cause problems.
• Store unit in a clean, dry area. Do not store next to corrosive materials, such as fertilizer.
• NOTE: If storing in an unventilated or metal storage shed, be certain to rustproof the equipment by coating with a light oil or silicone.

Service & Adjustment

WARNING: ALWAYS STOP ENGINE AND DISCONNECT SPARK PLUG WIRE AND MOVE IT AWAY FROM SPARK PLUG BEFORE PERFORMING ANY ADJUSTMENTS OR REPAIRS.

Removing the Flail Screen

If the discharge area becomes clogged, remove the flail screen and clean area as follows:

• Stop the engine, make certain the chipper-shredder has come to a complete stop and disconnect spark plug wire from the spark plug before unclogging the chute.
• Loosen the two hand knobs on each side of the chute deflector. Lift the chute deflector up, and tie it out of the way.
• Remove two hairpin clips from the clevis pins which extend through the housing. Remove the clevis pins. Lift the flail screen from inside the housing. See figure 19.
• Clean the screen by scraping or washing with water. Reinstall the screen.
• NOTE: Be certain to reassemble the flail screen with the curved side down as shown in figure 19.

Figure 19 Description: Shows the chute deflector, hairpin clips, clevis pins, hex nuts, washers, flail screen, hand knobs, and chipper chute, illustrating the removal of the flail screen.

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.
• Remove the chipper chute by removing three hex nuts and washers. A 1/2" wrench is required. See figure 19.
• NOTE: When reassembling, the cupped washer goes on 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 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 20.
• Remove the other blade in the same manner.
• Replace or sharpen blades. If 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 19 (sharp edge is assembled toward the slotted opening in the impeller assembly).

Figure 20 Description: Illustrates removing a chipper blade using a 3/16" Allen wrench and a 1/2" wrench.

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 21.
• 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 opening on the back-up plate is toward the bottom of the unit. The back-up plate may be reversed to provide a new cutting edge.
• Loosen the two hand knobs and cupped washers which secure the chute deflector, and 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.

Figure 21 Description: Shows the shredding blade assembly, including Allen screws, Weld Bolt, Pipe, Sharp Edge of Blade, and Torque Wrench, illustrating how to hold the impeller while removing the blade.

NOTE: Use caution when removing the blade to avoid contacting the weld bolts 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 will cause excessive vibration when rotating at high speeds and may cause damage to the unit.
• The blade can be tested for balance by balancing it on a round shaft screwdriver or nail. Remove metal from the heavy side until it is balanced evenly. See figure 22.
• When reassembling the blade, tighten to between 550 and 650 inch pounds, or lacking torque wrench, tighten securely.

Figure 22 Description: Shows a blade being balanced on a nail.

Flails

The flails, located inside the housing, may be reversed when they become dull. It is suggested that this procedure be performed by your nearest Sears Service Department.

Carburetor Adjustment

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.

Minor carburetor adjustment may be required to compensate for differences in fuel, temperature, altitude or load.

NOTE: A DIRTY AIR CLEANER WILL CAUSE ENGINE TO RUN ROUGH. BE CERTAIN AIR CLEANER IS CLEAN AND ATTACHED TO THE CARBURETOR BEFORE ADJUSTING CARBURETOR. DO NOT MAKE UNNECESSARY ADJUSTMENTS. FACTORY SETTINGS ARE SATISFACTORY FOR MOST APPLICATIONS AND CONDITIONS.

• Close needle valve (see figure 23) clockwise (➡️) finger tight only. Forcing may cause damage. Then open 1-1/2 turns counterclockwise (⬅️).
• Start engine and allow to warm for five minutes.
• Close needle valve clockwise (➡️) until engine starts to lose speed (lean mixture). Then slowly open needle valve counterclockwise (⬅️) until engine JUST BEGINS to run unevenly. This mixture should be rich enough for best performance under load.
• Rotate throttle counterclockwise (⬅️) and hold against throttle stop.
• If engine idles, no further adjustment is necessary.
• If engine idles too fast, turn idle speed adjusting screw counterclockwise (⬅️) until slower speed is obtained.
• If engine dies, turn idle speed adjusting screw 1/4 turn clockwise (➡️). Place throttle control in FAST position and restart engine.
• Move throttle control to IDLE position. If engine does not idle, repeat third step.
• Test the engine by using the chipper-shredder. If engine tends to stall or die out, it usually indicates that the mixture is slightly lean and it may be necessary to open (⬅️) the needle valve slightly to provide a richer mixture. This richer mixture may cause a slight unevenness in idling.

Figure 23 Description: Shows carburetor adjustment points: Idle Speed Adjusting Screw, Throttle, Idle Mixture Valve, and Needle Valve (High Speed).

Engine Speed

Never attempt to change maximum engine speed. It is pre-set at the factory and should be changed only by a qualified service technician who has the necessary equipment.

Your engine speed has been factory set. 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.

Trouble Shooting

NOTE: For repairs beyond the minor adjustments listed above, please contact your nearest SEARS Service Center.

How to Order Replacement Parts

Each chipper-shredder has its own model number. Each engine has its own model number.

The model number for your chipper-shredder will be found on a label attached to the frame.

ENGINE MODEL NO.: 190412-6143-01, 190432-6117-01

The model number for the engine will be found on the blower housing of the engine.

All parts listed herein may be ordered through Sears, Roebuck and Co. Service Centers and most Retail Stores.

WHEN ORDERING REPAIR PARTS, ALWAYS GIVE THE FOLLOWING INFORMATION:

• PRODUCT: "8 H.P. Chipper-Shredder"
• MODEL NUMBER: 247.795860, 247.795861
• PART NUMBER
• PART DESCRIPTION

Your Sears merchandise has added value when you consider that Sears has service units nationwide staffed with Sears trained technicians, professional technicians specifically trained on Sears products, having the parts, tools and the equipment to insure that we meet our pledge to you... "we service what we sell."