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Istruzioni per l'uso Stihl, Modello HT 56 C

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After long period of full-throttle operation Allow engine to run for a short while at idle speed so that engine heat can be dissipated by the flow of cooling air. This protects engine-mounted components (ignition, carburetor) from thermal overload. After Finishing Work N Slacken off the chain if you have retensioned it at operating temperature during cutting work. Always slacken off the chain after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the gear shaft and bearings. Storing your saw for a short period Wait for the engine to cool down. Drain the fuel tank. Store the machine in a dry location. Check the tightness of all accessible screws and nuts (not adjusting screws) at regular intervals and retighten if necessary. Storing for a long period See chapter on "Storing the Machine" Taking Care of the GuideBar 3 2 1 390BA050 KN N Turn the bar over – every time you sharpen the chain and every time you replace the chain – this helps avoid one-sided wear, especially at the nose and underside of the bar. N Regularly clean the oil inlet hole (1), the oilway (2) and the bar groove (3). N Measure the groove depth – with the scale on the filing gauge (special accessory) – in the area used most for cutting. Chain type Chain pitch Minimum groove depth Picco 3/8" P 0.20" (5.0 mm) Rapid 1/4" 0.16" (4.0 mm) English If groove depth is less than specified: N Replace the guide bar. The drive link tangs will otherwise scrape along the bottom of the groove – the cutters and tie straps will not ride on the bar rails. HT 56 C 25 English Cleaning the Air Filter Adjusting the Carburetor The carburetor comes from the factory If there is a noticeable loss of engine power 547BA023 KN 4 with a standard setting. This setting provides an optimum fuel-air mixture under most operating conditions. With this carburetor it is only possible to 1 2 3 547BA022 KN N Reach into the recess (4) in the filter housing and take out the felt make corrections with the adjusting filter (5). N Fit a new felt filter element (5). As a temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not screws within fine limits. Standard Setting N Shut off the engine N Move the choke lever (1) to <. N Turn the screw (2) in the filter cover (3) counterclockwise until the cover is loose. N Ease the filter cover (3) over the choke lever and lift it away. N Clean away loose dirt from around the filter. wash. Replace damaged parts. N Fit the felt filter (5) in the filter housing, make sure it is properly seated – the arrow points to the recess. N Move the choke lever (1) to <. N Fit the filter cover in position, making sure the screw is square. Tighten down the screw. N Check chain tension N Check the air filter and replace the element if necessary. N Have the spark arresting screen (not all markets) checked – see “Inspection and Maintenance by Dealer" 547BA024 KN NTurn the high speed screw (H) counterclockwise as far as stop (max. 3/4 turn possible). NTurn the low speed screw (L) counterclockwise as far as stop (max. 3/4 turn possible). 26 HT 56 C N Start and warm up the engine if necessary. N Adjust idle speed with the idle speed screw (LA) so that the saw chain does not rotate. Fine Tuning for Operation in Mountains or at Sea Level A slight correction of the setting may be necessary if engine power is not satisfactory when operating at high altitude or at sea level. N Warm up the engine. At high altitude N Turn high speed screw (H) clockwise (leaner) – no further than stop. At sea level N Turn high speed screw (H) counterclockwise (richer) – no further than stop. Adjusting Idle Speed N Warm up the engine. Engine stops while idling N Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly – the saw chain must not rotate. Chain rotates when engine is idling N Turn the idle speed screw (LA) counterclockwise until the chain stops moving and then turn the screw another full turn in the same direction. If the saw chain continues to rotate when the engine is idling, have your machine checked and repaired by your servicing dealer. Erratic idling behavior, engine stops even though setting of LA-screw has been corrected, poor acceleration Idle setting is too lean N Turn the low speed screw (L) counterclockwise, no further than stop, until the engine runs and accelerates smoothly. Erratic idling behavior, engine speed drops when swinging the machine Idle setting is too rich N Turn the low speed screw (L) clockwise (1/8 of a turn or 45° at a time) until the engine runs smoothly and accelerates well. It is usually necessary to change the setting of the idle speed screw (LA) after corrections to the low speed screw (L). English Spark Plug If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. Wrong fuel mix (to...