Stihl Ms 270 C Owners Manual
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30 English / USAMS 270, MS 270 C, MS 280, MS 280 C : When fitting the chain sprocket cover, check that the teeth of the tensioning gear and adjusting wheel mesh properly. If necessary, turn the adjusting wheel (12) slightly until the sprocket cover can be pushed flush against the engine housing. : Pull out the hinged clip (13) so that it snaps into position. : Engage wingnut and tighten it down moderately. Go to chapter Tensioning the Saw Chain Retensioning during cutting work: : Shut off the engine first – and then loosen the nuts. : Hold the bar nose up and use screwdriver to turn tensioning screw (1) clockwise until chain fits snugly against the underside of the bar. : While still holding the bar nose up, tighten down the nuts firmly. : Go to “Tensioning the Saw Chain” A new chain has to be retensioned more often than one that has been in use for some time. : Check chain tension frequently – see During Operation. Retensioning during cutting work: : Shut off the engine. : Pull out the hinged clip and loosen the wingnut. : Turn the adjusting wheel (1) clockwise as far as stop. : Tighten down the wingnut (2) firmly by hand. : Fold down the hinged clip. : Follow instructions in Checking Chain Tension. A new chain has to be retensioned more often than one that has been in use for some time. : Check chain tension frequently – see Operating Instructions. 13 12 133BA036 KN Tensioning the Saw Chain(Side chain tensioner) 1 133BA024 KN Tensioning the Saw Chain(Quick chain tensioner) 1 2 001BA112 KN
31 MS 270, MS 270 C, MS 280, MS 280 C English / USA : Shut off the engine. : Wear work gloves. : Chain must fit snugly against the underside of the bar – and, with the chain brake disengaged, it must still be possible to pull the chain along the bar by hand. : If necessary, retension the chain. A new chain has to be retensioned more often than one that has been in use for some time. Check chain tension frequently – see Operating Instructions. This engine is certified to operate on unleaded gasoline and the STIHL two- stroke engine oil at a mix ratio of 50:1. Your engine requires a mixture of high- quality gasoline and quality two-stroke air cooled engine oil. Use mid-grade unleaded gasoline with a minimum octane rating of 89 (R+M/2). If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel. Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine. The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only nationally recognized high-quality unleaded gasoline!Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines. We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STlHL engines. Do not use BIA or TCW rated (two- stroke water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the canister from your vehicle and place the canister on the ground before filling. Do not fill fuel canisters that are sitting in or on a vehicle. The canister should be kept tightly closed in order to avoid any moisture getting into the mixture. The machine‘s fuel tank and the canister in which fuel mix is stored should be cleaned as necessary. Checking Chain Tension 143BA007 KN Fuel
32 English / USAMS 270, MS 270 C, MS 280, MS 280 C Fuel mix ages Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Close the canister and shake it vigorously by hand to ensure proper mixing of the oil with the fuel. Dispose of empty mixing-oil canisters only at authorized disposal locations. Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank. Always position the machine so that the filler cap points upwards. Always thoroughly shake the mixture in the canister before fueling your machine. In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure build-up in the tank to release slowly. Opening the cap : Raise the grip until it is upright. : Turn the cap counterclockwise (approx. a quarter turn). : Remove the filler cap. Gaso- line Oil (STIHL 50:1 or equivalent high-quality oils) US gal. US fl.oz 12.6 2 1/2 6.4 512.8 Fueling 001BA159 KN 001BA160 KN001BA161 KN
33 MS 270, MS 270 C, MS 280, MS 280 C English / USA Closing the cap : Fit the cap - grip upright -marks must line up. : Turn the cap clockwise as far as stop (approx. a quarter turn). : Fold the grip flush with the top of the cap. If the grip does not lie completely flush with the cap and the detent on the grip does not engage the recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps. Change the fuel pickup body once every year: Drain the fuel tank. : Use a hook to pull the fuel pickup body out of the tank and take it off the hose. : Push the new pickup body into the hose. : Place the pickup body in the tank. For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant with non-fling additive or the rapidly biodegradable STIHL BioPlus is recommended. Biological chain oil must be resistant to aging (e.g. STIHL BioPlus) since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive, clutch and chain. It may even cause the oil pump to seize. The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formulated chain lubricant. 001BA162 KN001BA163 KN 165BA003 KN Chain Lubricant
34 English / USAMS 270, MS 270 C, MS 280, MS 280 C If special chain lubricant is not available, you may – in an emergency – use an HD single grade or multigrade engine oil with a viscosity that suits the prevailing outside temperature. Do not use waste oil! Medical studies have shown that renewed contact with waste oil can cause skin cancer. Moreover, waste is environmentally harmful! Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication. : Thoroughly clean the oil filler cap and the area round it to ensure that no dirt falls into the tank. : Remove the filler cap. : Refill the chain oil tank every time you refuel. : Close the filler cap. There must still be a small amount of oil in the oil tank when the fuel tank is empty. If the oil level in the tank does not go down, the reason may be a problem in the oil supply system: Check chain lubrication, clean the oilways, contact your servicing dealer for assistance if necessary. STIHL recommends that you have maintenance and repair work performed only by a STIHL servicing dealer. The saw chain must always throw off a small amount of oil. Never operate your saw without chain lubrication. If the chain runs 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 “Checking Chain Tension”. Filling Chain Oil Tank 001BA158 KN Checking Chain Lubrication 143BA024 KN
35 MS 270, MS 270 C, MS 280, MS 280 C English / USA Locking chain with chain brake– in an emergency – when starting – at idling speed The chain is stopped and locked when the hand guard is pushed toward the bar nose by the left hand – or when brake is activated by inertia in certain kickback situations. Releasing the chain brake: Pull the hand guard back toward the front handle. Always disengage chain brake before accelerating engine and before starting cutting work. The only exception to this rule is when you check operation of the chain brake. High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake). The chain brake is designed to be activated also by the inertia of the front hand guard if the forces are sufficiently high. The hand guard is accelerated toward the bar nose - even if your left hand is not behind the hand guard, e.g. during a felling cut. The chain brake will operate only if it has been properly maintained and the hand guard has not been modified in any way. Check operation of chain brakeBefore starting work: Run engine at idle speed, engage the chain brake (push hand guard toward bar nose). Accelerate up to full throttle for no more than 3 seconds – the chain must not rotate. The hand guard must be free from dirt and move freely. Chain Brake 143BA011 KN 143BA012 KN
36 English / USAMS 270, MS 270 C, MS 280, MS 280 CChain brake maintenanceThe chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: At temperatures below +50 °F (+10 °C), preheat carburetor as follows::Use a suitable screwdriver to turn the shutter ( 1) from the summer position ( s) to the winter position ( r ) – the shutter must snap into position. If the carburetor box cover is removed, the shutter can be turned to the required position by hand. Heated air is now drawn in from around the cylinder and mixed with cold air – this helps prevent carburetror icing. : At temperatures above +68 °F (+20 °C) : Turn the shutter back to the summer position ( s). This is essential to avoid engine running problems and overheating. At temperatures below +14 °F (-10 °C):It is advisable to fit the cover plate (special accessory) on the fan cover in extremely cold conditions (temperatures below -10 °C, in powder or drifting snow). The cover plate partially blanks off the slots in the fan cover to help prevent snow being sucked into the machine. When the cover plate is fitted, the shutter must be in the winter position. : If your saw is very cold (frost or ice on machine), start the engine and keep it at a high idle speed (with chain brake disengaged) until it reaches normal operating temperature. In the event of engine running problems, first check that conditions for use of the cover plate still apply. If engine idle speed is erratic or acceleration is poor : Turn low speed screw ( L) 1/4 turn counterclockwise. It is usually necessary to change the setting of the idle speed screw ( LA) after making adjustments to the the low speed screw ( L) – see “Adjusting the Carburetor”. Full-time professional users: every 3 months Semi-professional users (in agriculture and construction): every 6 months Hobby and occasional users: every 12 months Winter Operation 146BA000 KN 1
37 MS 270, MS 270 C, MS 280, MS 280 C English / USA The four positions of the Master Control lever 0 = Engine off – ignition is switched off. # = Normal run position – engine runs or can fire. To move the Master Control lever from # to n or l , press down the throttle trigger interlock and squeeze throttle trigger at the same time. n =Warm start – this position is used to start a warm engine. The Master Control lever moves to the normal run position as soon as the throttle trigger is squeezed. l =Cold start – this position is used to start a cold engine. Starting the Engine Only Models with Decompression Va l v e: Press in the button (arrow) to open the decompression valve. The valve closes automatically as soon as the engine begins to fire. : For this reason the decompression valve should be pressed in before each starting attempt. All Models:Observe safety precautions. : Push hand guard ( 1) forward: The chain is now locked. : Press down trigger interlock ( 2) and squeeze throttle trigger ( 3) at the same time. Set Master Control lever to: for cold start l for warm start n (even if engine has been running but is still cold) Information Before You Start STOP 0 001BA140 KN Starting / Stopping the Engine 146BA001 KN 3 146BA002 KN 2 STOP 1 0
38 English / USAMS 270, MS 270 C, MS 280, MS 280 C : Place your saw on the ground. Make sure you have a firm footing – check that chain is not touching any object or the ground. Bystanders must be well clear of the general work area of the saw. : Hold the saw firmly on the ground with your left hand on the front handle – your thumb should be under the handle. : Put your right foot into the rear handle and press down. Alternative method of starting: : Hold the rear handle tightly between your legs, just above the knees. : Hold the front handle firmly with your left hand – your thumb should be under the handle. : Pull the starter grip slowly with your right hand until you feel it engage – and then give it a brisk strong pull and push down the front handle at the same time. Do not pull out starter rope to its full length – it might otherwise break. Do not let the starter grip snap back – guide it slowly and vertically into the housing so that the starter rope can rewind properly. If engine is new, pull starter grip several times to prime the fuel line. 146BA003 KN 146BA004 KN 146BA005 KN
39 MS 270, MS 270 C, MS 280, MS 280 C English / USA When engine begins to fire: : Press in decompression valve. : Move Master Control lever ( 4) to n and continue cranking – as soon as engine runs, immediately blip the throttle trigger ( 5) – the Master Control lever ( 4) will move to the “Run” position # (6) and the engine will settle down to idling speed. . As the chain brake is still engaged, the engine must be returned to idling speed immediately – or the engine and chain brake might otherwise be damaged. : Pull the hand guard back toward the front handle: = The chain brake is now disengaged – your saw is ready for operation. Always disengage chain brake before accelerating engine. High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake). : Observe safety precautions. : Always check operation of chain lubrication before starting work. At very low outside temperatures::Allow engine to warm up at part throttle. : Change over to winter operation if necessary – see “Winter Operation”.To shut down the engine: :Move Master Control lever to 0 If fuel tank has been run until dry and then refueled::Press in decompression valve. : Start as described for warm engine (warm start n).If fuel tank has been run completely dry (engine stops) and then refueled:: Press in button to open the decompression valve. Start as described for cold engine (cold start l). 6 4 0 STOP 146BA006 KN 5 150BA007 KN