Stihl 181 C Manual
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MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 29 NGuide the drive link into the bar groove (see arrow) and turn the tensioning gear to the left as far as possible NFit chain sprocket cover, sliding the guide lugs into the engine housing openings When fitting the chain sprocket cover, the teeth of the adjusting wheel and the tensioning gear must mesh; if necessary,Nturn the adjusting wheel (4) a little until the chain sprocket cover can be slid completely against the engine housing NSwing grip (5) into position (until it engages) NFit wing nut and tighten lightly NNext step: see "Tensioning the Saw Chain" Retensioning during cutting work: NSwitch off the engine. NLoosen the nut. NHold the bar nose up. NUse a screwdriver to turn the tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar. NWhile still holding the bar nose up, tighten down the nut firmly. NGo to "Checking Chain Tension". A new chain has to be retensioned more often than one that has been in use for some time. NCheck chain tension frequently – see chapter on "Operating Instructions". 135BA011 KN 4 5 2310BA018 KN 7HQVLRQLQJWKH6DZ&KDLQ VLGHFKDLQWHQVLRQHU 1 142BA063 KN
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 30 Retensioning during cutting work: NShut off the engine. NPull out the hinged clip and loosen the wingnut. NTurn the adjusting wheel (1) clockwise as far as stop. NTighten down the wingnut (2) firmly by hand. NFold down the hinged clip. NGo to "Checking Chain Tension" A new chain has to be retensioned more often than one that has been in use for some time. NCheck chain tension frequently – see chapter on "Operating Instructions".NShut off the engine. NWear work gloves to protect your hands. NThe chain must fit snugly against the underside of the bar and it must still be possible to pull the chain along the bar by hand when the chain brake is released. NIf necessary, retension the chain. A new chain has to be retensioned more often than one that has been in use for some time. NCheck chain tension frequently – see chapter on "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 two-stroke air cooled engine oil. Use mid-grade unleaded gasoline with a minimum octane rating of 89 ((R+M)/2) and no more than 10% ethanol content. NOTICE Fuel with an octane rating below 89 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 damage the engine. For this reason STIHL recommends that you use only quality unleaded gasoline! NOTICE Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines and should not be used. For further details, see www.STIHLusa.com/ethanol The ethanol content in gasoline affects engine speed – it may be necessary to readjust the carburetor if you use fuels with various ethanol contents. Tensioning the Saw Chain (quick chain tensioner) 1 2 001BA112 KN &KHFNLQJ&KDLQ7HQVLRQ 142BA064 KN )XHO
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 31 WARNING To reduce the risk of personal injury from loss of control and/or contact with the running cutting tool, do not use your unit with an incorrect idle adjustment. At correct idle speed, the cutting tool should not move. If your machine’s idle speed is incorrectly adjusted, have your authorized STIHL servicing dealer check your machine and make the proper adjustments and repairs. The idle speed and maximum speed of the engine change if you switch from a fuel with a certain ethanol content to a fuel with a much higher or lower ethanol content. This problem can be avoided by always using fuel with the same ethanol content. To ensure the maximum performance of your STIHL engine, use a high quality 2- cycle engine oil. To help your engine run cleaner and reduce harmful carbon deposits, STIHL recommends using STIHL HP Ultra 2-cycle engine oil or ask your dealer for an equivalent fully synthetic 2-cycle engine oil. To meet the requirements of EPA and CARB we recommend to use STIHL HP Ultra oil. STIHL MotoMix STIHL recommends the use of STIHL MotoMix. STIHL MotoMix has a high octane rating and ensures that you always use the right gasoline/oil mix ratio.STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil suited for high performance engines. For further details, see www.STIHLusa.com/ethanol If not using MotoMix, use only STIHL two-stroke engine oil or equivalent high- quality two-stroke engine oils that are designed for use in air cooled two-cycle engines. The use of non-seasonal gasoline blends may increase the potential for pressure to build in the fuel tank during operation. For example, using a winder blend during the summer will increase pressure in the fuel tank. Always use gasoline blends appropriate to the season, altitude and other environmental factors. 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, chain saws, mopeds, etc.). WARNING Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the container from your vehicle and place the container on the ground before filling. To reduce the risk of sparks from static discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer. The container should be kept tightly closed in order to limit the amount of moisture that gets into the mixture.The machine‘s fuel tank should be cleaned as necessary. Fuel mix ages If not using MotoMix, only mix sufficient fuel for a few days of work, not to exceed 30 days of storage. Store in approved fuel-containers only. When mixing, pour oil into the container first, and then add gasoline. Close the container and shake it vigorously by hand to ensure proper mix of oil and gasoline. Dispose of empty mixing-oil containers only at authorized disposal locations. Gaso- lineOil (STIHL 50:1 or equiva- lent high-quality oils) US gal. US fl.oz. 12.6 2 1/2 6.4 5 12.8
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 32 Preparations NBefore fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank. Always thoroughly shake the mixture in the canister before fueling your machine. NPosition the machine so that the filler cap is facing up. WARNING In order to reduce the risk of fire and 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 Filler cap markings Filler caps and fuel tanks may be marked in different ways.Depending on the version, your unit may be equipped with a filler cap and fuel tank with or without symbols. Filler cap without symbols Opening NRaise handle. NTwist filler cap counterclockwise (approx. 1/4 turn).NRemove the filler cap. Refueling Take care not to spill fuel while fueling and do not overfill the tank – leave approx. 1/2" (13 mm) air space. Closing Handle is in an upright position: NInsert the cap – positioning marks on the cap and the fuel tank opening must line up. NThe cap should drop fully into the opening in this position. Fueling 001BA229 KN /HIW )LOOHUFDSZLWKRXWV\PEROV 5LJKW )LOOHUFDSZLWKPDUNLQJVDQG V\PEROVRQFDSDQGWDQN 001BA240 KN 001BA218 KN 001BA219 KN 001BA224 KN 001BA220 KN
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 33 NPush the filler cap down and twist it clockwise until it engages. NFlip the handle down. Checking for proper closure NThe lug on the grip must engage entirely in the recess (arrow), and the grip must lie completely flush with the top of the cap.NGrip the cap and check for tightness. NIf the cap can be moved, it is not properly installed. Misalignment of the cap parts NIf the cap does not drop fully into the opening when the positioning marks line up and/or if the cap does not tighten properly when twisted, the base of the cap may be rotated out of position vis-à-vis the top. NSuch misalignment can result from handling, cleaning or an improper attempt at tightening.NTo correct a misalignment, turn the cap (with the grip up) until it drops fully into the tank opening. NTwist the cap counterclockwise as far as it will go (approx. 1/4 turn) – this will twist the base of the cap into the correct position. NTwist the cap clockwise, closing it normally – see the sections "Closing" and "Checking for proper closure." NIf your cap still does not tighten properly, it may be damaged or broken; immediately stop use of the unit and take it to your authorized STIHL dealer for repair. Filler cap with markings and symbols Opening NRaise handle. 001BA221 KN 001BA222 KN 001BA223 KN /HIW %DVHRILPSURSHUO\DOLJQHG FDS ZLWKRSHQVSDFH 5LJKW %DVHRIFDSFRUUHFWO\SRVL- tioned for installation 001BA225 KN 001BA227 KN 001BA226 KN 001BA236 KN
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 34 NTwist filler cap counterclockwise (approx. 1/4 turn). Markings on filler cap and housing must align. NRemove the filler cap. Refueling Take care not to spill fuel while fueling and do not overfill the tank – leave approx. 1/2" (13 mm) air space.Closing Handle is in an upright position: NPosition filler cap – markings on filler cap and housing must align. NPush the filler cap down as far as it will go. NPush the filler cap down and twist it clockwise until it engages. Then the markings on filler cap and housing will align.NFlip the handle down. Filler cap is now closed. If the filler cap will not engage into the tank housing The base of the filler cap is rotated in relation to the upper part. NLook at the black alignment marks on the top of the filler cap. 001BA232 KN 001BA234 KN 001BA237 KN 001BA234 KN 001BA233 KN 001BA231 KN 001BA235 KN 001BA241 KN
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 35 NWith the filler cap in the filling neck, twist it counterclockwise until it drops into its seat. NContinue to twist the filler cap counterclockwise (approx. 1/4 turn) – this will twist the base of the cap into the correct position. NWhile pushing down on the cap, twist the filler cap clockwise and close it – see section "Closing."For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL BioPlus is recommended. NOTICE 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 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. WARNING Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful. NOTICE Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication. Preparations NThoroughly clean the oil filler cap and the area around it to ensure that no dirt falls into the tank. NPosition the machine so that the filler cap is facing up. NOpen the filler cap. Filling chain oil tank NRefill the chain oil tank every time you refuel. Take care not to spill chain oil while refilling and do not overfill the tank. NClose 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 fault in the oil supply system: Check chain lubrication, clean the oilways, contact your dealer Left: Base of filler cap is rotated – interior marking (1) is aligned with the exterior marking. Right: Base of filler cap is in the cor- rect position – interior marking is below the clip. It does not align with the exte- rior marking. 1 001BA238 KN 001BA239 KN &KDLQ/XEULFDQW)LOOLQJ&KDLQ2LO7DQN 001BA158 KN
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 36 for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. The saw chain must always throw off a small amount of oil. NOTICE 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 the oil level in the tank before starting work. Every new chain has to be broken in for about 2 to 3 minutes. After breaking in the chain, check chain tension and adjust if necessary – see "Checking Chain Tension". 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. Checking Chain Lubrication 143BA024 KN &KDLQ%UDNH 143BA011 KN
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 37 Releasing the chain brake NPull the hand guard back toward the front handle. NOTICE 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 brake Before 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 maintenance The 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: Winter shutter (MS 211 only) At temperatures below +50°F (+10°C): NRemove the shroud – see "Shroud". NUse the combination wrench to turn the shutter, next to the spark plug, 45° counterclockwise. NInstall the shroud – see "Shroud". Heated air is now drawn in from around the cylinder to warm the carburetor – this helps prevent carburetor icing. 143BA012 KN )XOOWLPHXVDJH HYHU\ PRQWKV 3DUWWLPHXVDJH HYHU\ PRQWKV 2FFDVLRQDOXVDJH HYHU\ PRQWKV :LQWHU2SHUDWLRQ :LQWHURSHUDWLRQ 6XPPHURSHUDWLRQ 1 533BA003 KN 2
MS 171, MS 181, MS 181 C, MS 211, MS 211 C English 38 NOTICE At temperatures above +68°F (+20°C), return the shutter to the summer position. This is necessary to avoid engine running problems and overheating. Fitting the cover plate (Special accessory, not for Easy2Start models) NPlace the cover plate (1) in position and secure it with the screws (2). NIf your saw is very cold, start the engine and run it until it reaches normal operating temperature. MS 211 only: When the cover plate is fitted, the winter shutter may be in either the winter or summer positions. Move it to the winter position when temperatures drop below +50°F (+10°C). Versions with Easy2Start WARNING This machine is extremely simple and easy to start, even for children. To reduce the risk of serious or fatal injury: –do not allow children or other unauthorized persons to attempt to start or otherwise use the machine –never allow children or unauthorized persons access to the machine –never leave the machine unattended while working or during work breaks –after work, store in a safe, secure location out of the reach of children and other unauthorized persons Positions of Master Control lever Stop 0 – engine off – the ignition is switched off. Normal run positionF – engine runs or can fire. Starting throttle?n – 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. Choke shutter closedl – this position is used to start a cold engine. Setting the Master Control lever To move the Master Control lever from the normal run position (F) to choke closed (l), press down the throttle lockout and squeeze the throttle trigger 22 1 533BA014 KN 6WDUWLQJ6WRSSLQJWKH (QJLQH STOP 0 001BA140 KN