Stihl Fs 80 R Owners Manual
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30 English / USAFS 80, FS 80 R, FS 85, FS 85 R STIHL AutoCut : Hold the rotating mowing head above the ground – tap it on the ground once – about 1 1/4 (3 cm) fresh line is advanced. The blade on the deflector trims overlong line to the correct length – avoid tapping head more than once at a time. Line feed operates only if both lines still have a minimum length of 1 (2.5 cm) . All other mowing heads Refer to the instructions supplied with the mowing head. To reduce the risk of injury, always shut off the engine before adjusting the nylon line by hand. Replacing Nylon Line or Cutting Blades Refer to the instructions supplied with the mowing head. Mounting Metal Cutting Tools Remove the skirt and blade from the mowing head deflector before mounting grass cutting blade 230-4 (1), grass cutting blade 230-8 (2), or brush knife (3) – see “Mounting the Deflector” Fit the appropriate limit stop before mounting the circular saw blade 200 (4,5) – see “Mounting the Deflector”. : Lay your machine on its back with the gearhead facing upward. Cutting edges of (1) and (3) may point in either direction. Cutting edges of (2), (4) and (5) must point clockwise. Direction of rotation is marked by arrow on inside of cutting head deflector or limit stop.
31 FS 80, FS 80 R, FS 85, FS 85 R English / USA : Place the cutting tool (6) on the thrust plate (7). Collar (see arrows) must locate in cutting tool’s mounting hole. : Slip thrust washer (8) and rider plate (9) over the output shaft (10). : Block the output shaft and : Screw the mounting nut (11) with the combination wrench (12) onto the output shaft counterclockwise and tighten down firmly. If the mounting nut is too loose, fit a new one. Removing cutting tool : Block the output shaft. : Unscrew the nut clockwise. : Removing the cutting tool – do not remove the thrust plate (7). 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. Fuel
32 English / USAFS 80, FS 80 R, FS 85, FS 85 R 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 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. After fueling, tighten fuel cap as securely as possible by hand. Change the fuel pick up body every year. Before storing your machine for a long period, drain and clean the fuel tank and run engine until carburetor is dry. 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 389BA031 KN389BA032 KN
33 FS 80, FS 80 R, FS 85, FS 85 R English / USA The type and style of harness depend on the market. Shoulder Strap : Put on the shoulder strap ( 1). : Adjust the length of the strap so that the spring hook ( 2) is about a hand’s width below your right hip. : Balance the brushcutter. The use of the harness is described in chapter “Approved Combinations of Cutting Tool, Deflector, Handle and Harness”. Full harness : Put on the full harness (1). : Adjust length until the spring hook (2) is about a hand’s width below your right hip. : Balance the brushcutter. The use of the harness is described in chapter “Approved Combinations of Cutting Tool, Deflector, Handle and Harness”. Attaching Harness to Brushcutter : Attach the spring hook ( 1) to the clamp ( 2) (carrying ring) on the drive tube. Fitting the HarnessBalancing the Brushcutter
34 English / USAFS 80, FS 80 R, FS 85, FS 85 R : Loosen the screw ( 3). Balancing the Machine The machine has to be balanced to suit the cutting tool you are using. Carry out the following steps to reach the condition described under “Point of balance”: : Slide the clamp up or down the drive tube. Tighten the screw moderately. Let go of the machine and check to see how it is balanced. Point of balance A Mowing tools Mowing heads, grass cutting blades and brush knife should just touch the ground. B Circular saw blades should hover about 8 in (20 cm) above the ground. When the correct point of balance is reached: : Tighten down the clamp screw firmly. Disconnecting Brushcutter from Harness Depending on the type of spring hook (carabiner): :Press down the bar on the spring hook ( 1) and take the clamp (2) off the hook. A 002BA034 KN B 002BA035 KN
35 FS 80, FS 80 R, FS 85, FS 85 R English / USA Controls Control handle on bike handle Throttle trigger interlock ( 1) Throttle trigger ( 2) Slide control ( 3) Control handle on drive tube Throttle trigger interlock ( 1) Throttle trigger ( 2) Slide control ( 3) Positions of slide control STOP -O (4) – engine off – the ignition is switched off # – normal run position ( 5) – the engine is running or can start START (6 ) - the ignition is switched on, the engine can start Symbol on slide control h ( 7 ) – stop symbol and arrow – to stop the engine, push the slide control in direction of arrow on stop symbol ( h ) to STOP -O . Starting : Hold down the throttle trigger interlock and squeeze the throttle trigger. : While holding both levers in this position, move the slide control to START and hold it there. : Now release the throttle trigger, slide control and trigger interlock in that order. This is the starting throttle position . Starting / Stopping the Engine 3STOP 56 4 7 002BA182 KN 1 2 STARTSTOP- 3 STOP 2 5 6 4 7 002BA181 KN START STOP- 1
36 English / USAFS 80, FS 80 R, FS 85, FS 85 R : Set the choke knob ( 8): For cold start to g For warm start to e – also use this position if engine has been running but is still cold : Press fuel pump bulb ( 9) at least five times – even if the bulb is already filled with fuel. : Place the unit on the ground: It must rest securely on the engine support and deflector. Check that the cutting tool is not touching the ground or any other obstacles. : Make sure you have a firm footing. : Hold the unit with your left hand and press it down firmly – your thumb should be under the fan housing. Do not stand or kneel on the drive tube! : Pull the starter grip slowly with your right hand until you feel it engage and then give it a brisk strong pull. Do not pull out the starter rope to full length – it might otherwise break. : Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly. : Continue cranking until engine runs. 393BA017 KN 8 8 393BA018 KN 9 002BA038 KN 002BA040 KN357BA033 KN
37 FS 80, FS 80 R, FS 85, FS 85 R English / USA When the engine begins to fire: : Turn choke knob to e and continue cranking. When the engine begins to fire: : Blip the throttle trigger immediately so that the slide control moves to the normal run position # and the engine settles down to idle speed. Make sure the carburetor is correctly adjusted – the cutting tool must not rotate when the engine is idling. Your machine is now ready for operation. Stopping the engine : Push the slide control in direction of arrow on stop symbol ( h ) to STOP -O . At very low outside temperatures As soon as engine runs: : Blip the throttle trigger to disengage the starting throttle position. The slide control moves to the normal run position # and the engine settles down to idle speed. : Open the throttle slightly. : Warm up engine for brief period. If the engine does not start Choke knob If you did not turn the choke knob to e quickly enough after the engine began to fire, the combustion chamber has flooded. : Turn choke knob to e : Select starting throttle position. : Start the engine by pulling the starter rope firmly. 10 to 20 pulls may be necessary. If the engine still does not start: : Move the slide control to STOP-O . : Pull off the spark plug boot ( 10). : Unscrew and dry off the spark plug. : Open the throttle wide. : Crank the engine several times with the starter to clear the combustion chamber. : Refit the spark plug. Connect the spark plug boot (press it down firmly). : Move the slide control to START. : Set the choke knob to e – even if engine is cold. : Now start the engine. Throttle cable adjustment : Check adjustment of throttle cable – see chapter on Adjusting the Throttle Cable. Tank run until dry : After refueling, press the fuel pump bulb at least five times – even if bulb is filled with fuel. : Set choke knob according to engine temperature. : Now start the engine. 10 393BA042 KN
38 English / USAFS 80, FS 80 R, FS 85, FS 85 R During break-in period 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. During operation After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects engine- mounted components (ignition, carburetor) from thermal overload. After finishing work Wait for engine to cool down. Drain the fuel tank. Store the machine in a dry place. Check tightness of nuts and screws (not adjusting screws) at regular intervals and retighten as necessary. Dirty air filters reduce engine power increase fuel consumption and make starting more difficult. If there is a noticeable loss of engine power : Move choke lever to g. : Press in the tab ( 1 ). : Ease the filter cover ( 2) over the tab and take it away. : Clean away loose dirt from around the filter. : Remove the foam and felt filter elements. : Wash the foam element in a clean, non-flammable cleaning solution (e.g. warm soapy water) and then dry. : Fit new felt element. As a temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not wash. Replace damaged parts! : Install the foam element ( 3) in the filter cover ( 2). : Place felt element ( 4) (lettering facing inward) in filter housing ( 5). : Fit filter cover so that it snaps into position. Operating Instructions Cleaning the Air Filter 355BA014 KN 2 1 2 3355BA031 KN 45 355BA032 KN
39 FS 80, FS 80 R, FS 85, FS 85 R English / USA Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware. The carburetor comes from the factory with a standard setting. This setting provides an optimum fuel-air mixture under most operating conditions. With this carburetor it is only possible to adjust the engine idle speed within fine limits.! Standard Setting :Shut off the engine. : Mount FS cutting tool, Power Tool Attachment or CombiTool. : Check the air filter and replace if necessary. : Check adjustment of throttle cable – adjust if necessary – see Adjusting the Throttle Cable. : Turn high speed screw (H) counterclockwise (max. 3/4 turn) as far as stop. : Carefully screw the low speed screw (L) down onto its seat. Then open it one turn counterclockwise. : Start and warm up the engine. : Adjust idle speed with the idle speed screw (LA) so that the cutting tool does not rotate. Fine Tuning A slight correction of the setting of the high speed screw (H) may be necessary if engine power is not satisfactory when operating at high altitude or at sea level or after changing the cutting tool. Motor Management Adjusting the Carburetor 265BA024 KN LA HL 1 3 / 4