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Instruções de Operação Stihl, Modelo 025

Fabricante : Stihl
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If the chain is run dry, the whole cutting attachment will be irretrievably damaged within a very short time. Always check chain lubrication and oil level in tank before starting work. • Every new chain has to be broken in for about 2 to 3 minutes. • After breaking in chain, check chain tension and adjust if necessary -see section "Checking chain tension". 38 021, 023, 025 During Break-in Period During Operation A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings. Do not make the mixture leaner to achieve an apparent increase in power - this could damage the engine - see chapter - "Adjusting Carburetor". Always disengage chain brake before accelerating engine and before starting cutting work. High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake). Begin cutting with the saw at full throttle and keep it at all full throttle all the way through the cut. Always cut with a properly sharpened chain and apply only moderate feed pressure. The sound and running behavior of the saw must remain constant. Engine speed may only drop a little in the cut -the chain must not jerk or stop. Pay attention to the sound of the engine. If engine noise drops suddenly or begins to pulsate, or the chain stops, reduce feed pressure immediately to avoid overheating and possible damage to the engine housing and chain brake. Check chain tension frequently. A new chain has to be retensioned more often than one that has been in use for some time. Cold chain: Tension is correct when chain fits snugly against the underside of the bar and can still be pulled along the bar by hand. Retension if necessary -see chapter "Tensioning the Saw Chain11. Chain at operating temperature: The chain stretches and begins to sag. The drive links on the underside of the bar must not come out of the bar groove - the chain may otherwise jump off the bar. Retension the chain - see chapter "Tensioning the Saw Chain". Always slacken off the chain again after finishing work. The chain contracts as it coois down. If it is not slackened off, it may damage the crankshaft and bearings. After a long period of full-throttle operation Allow engine to run for a short while at idling speed so that engine heat can be dissipated by the flow of cooling air. This helps protect engine-mounted components (ignition, carburetor) from thermal overload. After Finishing Work Slacken off the chain if you have retensioned it at operating temperature during cutting work. The chain contracts as it cools down. If it is not slackened off, it could damage the crankshaft and bearings. 021,023,025 39 Cleaning Air Filter Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult. The air filter system can be adapted to suit different operating conditions by simply installing a choice of filters. Air filter (wire mesh) - for normal operating conditions and winter operation. Air filter (felt) - for dry and very dusty work areas. Clean the air filter when there is a noticeable loss of engine power. • Press down the throttle trigger interlock and set Master Control lever to "Cold Start" H • Turn the twist lock (1) 90° counterclockwise. • Lift off the carburetor box cover vertically. Always replace a damaged filter element. • Use soft brush to remove all loose dirt from filter and area around it. • Place fingers behind air filter (1), press thumps against the housing and swing filter in direction of rear handle. • Blow out filter with compressed air from clean air side. If filter fabric is caked with dirt: • Wash filter element in a clean, non-flammable cleaning solution (e.g. warm soapy water) and then dry. • Reinstall the filter. 40 021,023,025 Winter Operation At temperatures below +10°C/+50°F: • Press down the throttle trigger interlock and set Master Control I ever to "Cold Start" M • Turn the twist lock above the rear handle counterclockwise so that slot is vertical. • Lift off the carburetor box cover vertically. • Pull out shutter, in front of spark plug). • Turn shutter 180°. • Refit the shutter. • Refit the cover and secure with the twist lock. Heated air is now drawn in from around the cylinder and mixed with cold air - this helps prevent carburetor icing. At temperatures above +20°C/70°F -return shutter to summer position (closed). This is essential to avoid engine running problems, i.e. overheating. 021,023, 025 41 Taking Care of Guide Bar • Turn the bar over - every time you sharpen the chain -and every time you replace the chain - this avoids one-sided wear, especiallly...