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Hersteller: Sears Dateigröße: 830.9 kb Dateiname: Unterrichtssprache:

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. 13 FIGURE 20— Model 247.780892 Shown • 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. • Model 247.780892 only: Remove the two outside screws on the blade, using a 3/16" alien wrench and a 1/2” wrench. • Remove the blade by removing the center bolt, lock washer and flat washer. 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 21. • When reassembling the blade, tighten to between 550 and 650 inch pounds, or if lacking torque wrench, tighten securely. 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 A MADE TO THE ENGINE WHILE THE ENGINE IS RUNNING (E.G. CARBURETOR), KEEP CLEAR OF ALL MOVING PARTS. BE CAREFUL OF HEATED SUR-_FACES 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 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. 14 SERVICE RECOMMENDATIONS t SERVICE RECORD Fill in dates as you complete regular service SCHEDULE SERVICE DATES First 2 Hours Before Each Use Every 25 Hours Every 50 Hours Beginning Each Season Before Storage Check Fuel V Drain Fuel v1 Check Engine Oil Level V V Change Engine Oil V V Oil Pivot Points V Service Air Cleaner V Clean Engine Cooling Fins V V Replace or Clean Spark Plug V \ Spark Arrester Muffler \; The Service Recommendations Chart is supplied to assist the operator in proper maintenance of the chip-per-shredder. This is only a checklist; instructions will be found in the Maintenance and Service Adjustment sections of this manual. 4 15 TROUBLE SHOOTING PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION Engine fails to start • Fuel tank empty, or stale fuel. • Spark plug wire disconnected. • Faulty spark plug. • Fill tank with clean, fresh fuel. • Connect wire to spark plug. • Clean, adjust gap or replace. Loss of power; operation erratic • Spark plug wire loose. • Unit running on CHOKE. • Blocked fuel line or stale fuel. • Water or dirt in fuel system. • Carburetor out of adjustment. • Dirty air cleaner. • Connect and tighten spark plug wire. • Move choke lever to OFF position. • Clean fuel line; fill tank with clean fresh gasoline. • Disconnect fuel line at carburetor to drain fuel tank. Refill with fresh fuel. • Contact your SEARS Service Center. • Service air cleaner. See Maintenance section of this manual. Engine overheats • Carburetor not adjusted properly. • Engine oil level low. • Contact your SEARS Service Center. • Fill crankcase with proper oil. Too much vibration • Loose pans or damaged impeller. • Stop engine immediately and disconnect spark plug wire. Tighten all bolts and nuts. Make all necessary repairs. If vibration continues, have unit serviced by a SEARS Service Center. Unit does not discharge • Discharge chute clogged. • Foreign object lodged in impeller. • Stop engine immediately and disconnect spark plug wire. Clean flail screen and inside of blower housing. See Service/Adjustments section of this manual. • Stop engine immediately and disconnect spark plug wire. Remove lodged object. Rate of discharge slows considerably or composition of discharged material changes • Shredding blade and/or chipper blades dull. • Sharpen or replace shredding and chipper blades. NOTE: For repairs beyond the minor adjustments listed above, please contact your nearest SEARS Service Center. 4% 16 SEARS CRAFTSMAN 8 H.P. CHIPPER-SHREDDER MODEL NOS. 247.780891 Repair Parts 247.780892 ...

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