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Фрагмент инструкции
31). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly. NOTE: The cutting attachment should not rotate when the engine idles. 3. If the cutting attachment rotates when the engine idles, turn the idle speed screw counterclockwise 1/8 of a turn at a time (as needed), to reduce idle speed. Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all of the following are true: • the engine will not idle • the engine hesitates or stalls on acceleration • there is a loss of engine power Have the carburetor adjusted by an authorized service dealer. ROCKER ARM CLEARANCE This requires disassembly of the engine. If you feel unsure or unqualified to perform this, take the unit to an authorized service center. NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 25 hours of operation and then every 25 hours of operation thereafter. • The engine must be cold when checking or adjusting the valve clearance. • This task should be performed inside in a clean, dust free area. 1. Remove the two (2) screws on back of the engine cover and the one on the front of the engine cover with a Flat-head or T-25 Torx screwdriver (Fig. 32). 2. Remove the engine cover (Fig. 33). 3. Disconnect the spark plug wire. 4. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise. 5. Clean dirt from around the rocker arm cover. Remove the screw holding the rocker arm cover with a large flat blade screwdriver or Torx T-25 bit (Fig. 34). Remove the rocker arm cover and gasket. 6. Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that: • The piston is at the top of its travel while looking in the spark plug hole (Fig. 34) • Both rocker arms move freely, and both valves are closed If these statements are not true, repeat this step. 7. Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm (Fig. 36). Measure both the intake and exhaust valves. The recommended clearance for both intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. Figure 35 and 36 show how to measure the clearance. 8. If the clearance is not within specification: a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 36). • To increase clearance, turn the adjusting nut counterclockwise. • To decrease clearance, turn the adjusting nut clockwise. b. Recheck both clearances, and adjust as necessary. 9. Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m). 10. Check the spark plug and reinstall. See Replacing the Spark Plug. 11. Replace the spark plug wire. 12. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws. REPLACING THE SPARK PLUG Use a replacement part number 753-05255 spark plug. The correct air gap is 0.025 in. (0.635 mm). Remove the plug after every 25 hours of operation and check its condition. 1. Stop the engine and allow it to cool. Remove the two (2) screws on back of the engine cover and the one on the front of the engine cover with a Flat-head or T-25 Torx screwdriver (Fig. 32). 2. Grasp the plug wire firmly and pull the cap from the spark plug. 3. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise. Muffler Fig. 38 Slot Fig. 37 0.025 in. (0.635 mm.) Spark Arrestor Screen Diverter T-25 Screw T-20 Screw MAINTENANCE AND REPAIR INSTRUCTIONS WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it. WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it. WARNING: Do not sand blast, scrape or clean electrodes. Grit in the engine could damage the cylinder. TROUBLESHOOTING CAUSE ACTION Air filter is plugged Replace or clean the air filter Old fuel Drain gas tank and add fresh fuel Improper carburetor adjustment Adjust according to the Carburetor Adjustments section or take to an authorized service dealer for an adjustment CAUSE ACTION Old fuel Drain gas tank and add fresh fuel Improper carburetor adjustment Adjust according to the Carburetor Adjustments section or take to an authorized service dealer for an adjustment Cutting attachment bound with grass Stop the engine and clean the cutting attachment Dirty air filter Clean or replace the air filter Plugged spark arrestor Clean or replace spark arrestor ENGINE WILL NOT START ENGINE WILL NOT ACCELERATE ENGINE WILL NOT IDLE Idle Ajustment Screw Fig. 31 Fig. 32 Fig. 33 Muffler Roc...