Stihl Fs 55 R Instruction Manual
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FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish 29 Starting NPlace the unit on the ground: It must rest securely on the engine support and the deflector. Check that the cutting attachment is not touching the ground or any other obstacles. NMake sure you have a safe and secure footing. NHold the unit with your left hand and press it down firmly – your thumb should be under the fan housing.NHold the starter grip with your right hand. Version without Easy2Start NPull the starter grip slowly until you feel it engage and then give it a brisk strong pull. Version with Easy2Start NPull the starter grip slowly until you feel it engage and then pull it out slowly and steadily.Both versions NDo not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly. NContinue cranking. When the engine begins to fire: NAfter no more than five pulls, move the choke lever (8) to e. NContinue cranking. As soon as the engine runs Version with bike handle NBlip the throttle trigger – the engine settles down to idle speed. Version with loop handle NSqueeze the throttle trigger to disengage the tongue – the engine will settle down to idle speed. Your machine is now ready for operation. Do not stand or kneel on the drive tube. 233BA020 KN 233BA014 KN Do not pull out the starter rope all the way – it might otherwise break. Do not pull out the starter rope all the way – it might otherwise break. 232BA014 KN Make sure the carburetor is correctly adjusted. The cutting attachment must not rotate when the engine is idling. 8 232TI015 KN
FS 55, FS 55 C, FS 55 R, FS 55 RC English 30 Stopping the engine NMove the slide control in direction of the arrow (h) to STOP-0 or the stop switch to STOP / 0. If the engine does not start Choke lever If you did not move the choke lever to e quickly enough after the engine began to fire, the combustion chamber is flooded. NSet the choke lever to e. NSet the slide control, trigger lockout lever and throttle trigger to the starting throttle position. NStart the engine by pulling the starter rope briskly – 10 to 20 pulls may be necessary. If the engine still does not start NMove the slide control or stop switch toSTOP / 0. NRemove the spark plug – see Spark Plug. NDry the spark plug. NCrank the engine several times with the starter to clear the combustion chamber. NRefit the spark plug – see Spark Plug. NMove the slide control or stop switch to F/I. NSet the choke lever to e – even if the engine is cold. NNow start the engine.Fuel tank run until completely dry NAfter refueling, press the fuel pump bulb at least five times – even if the bulb is filled with fuel. NSet the choke lever to suit the engine temperature. NStart the engine. 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 the 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 Storing for a short period: Wait for the engine to cool down. Empty the fuel tank and keep the machine in a dry place, well away from sources of ignition, until you need it again. For longer out-of- service perionds – see Storing the Machine. Operating Instructions
FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish 31 If there is a noticeable loss of engine power NSet the choke lever to g. NPress in the tab (1) and swing the filter cover (2) down. NClean away loose dirt from around the filter.NRemove the felt element (3) from the filter housing (4) and replace it – knock out or blow out as a temporary measure – do not wash. NReplace damaged parts. NFit the felt element (3) in the filter housing (4). NClose the filter cover so that it snaps into position.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. Cleaning the Air Filter 232BA017 KN 12 232BA018 KN 4 3 Engine Management
FS 55, FS 55 C, FS 55 R, FS 55 RC English 32 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 high speed screw within fine limits. Standard Setting NStopping the Engine NMounting the cutting attachment NCheck the air filter and replace it if necessary. NHave the spark arrestor checked – see “Inspection and Maintenance by DealerNTurn high speed screw (H) counterclockwise as far as stop (no more than 3/4 turn). NTurn the low speed screw (L) carefully clockwise as far as stop, then turn it back 1.5 turns. NStart and warm up the engine if necessary. NAdjust idle speed with the idle speed screw (LA) so that the cutting attachment 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, sea level or after changing the cutting attachment.Rule of thumb: Turn the high speed screw (H) about one quarter of a turn for every 1000 m (3300 ft) change in altitude. Conditions for adjustment NCarry out the standard setting. NStart the engine and, with the mowing head mounted, warm it up for about 3 minutes. NOpen the throttle wide. At high altitude NTurn the high speed screw (H) clockwise (leaner), no further than stop, until there is no further noticeable increase in engine speed. At sea level NTurn the high speed screw (H) counterclockwise (richer), no further than stop, until there is no further noticeable increase in engine speed. It is possible that maximum engine speed may be reached with the standard setting in each case. Adjusting the Carburetor LH LA 233BA050 KN Adjust the high speed screw (H) only if you are using a mowing head, making sure the cutting lines are full length (as far as the line limiter blade on the deflector). If a metal cutting attachment is mounted, use the standard setting and adjust the high speed screw (H) as described above under Rule of thumb.
FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish 33 Aadjusting Idle Speed It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L). NWarm up the engine. Engine stops while idling NTurn the idle speed screw (LA) slowly clockwise until the engine runs smoothly – the cutting attachment must not turn. Cutting attachment rotates when engine is idling NTurn the idle speed screw (LA) counterclockwise until the cutting attachment stops moving and then rotate the screw another 1/2 to 1 turn in the same direction. Erratic idling behavior, engine stops even though setting of LA-screw has been corrected, poor acceleration Idle setting is too lean: NIdle setting is too lean: Rotate the low speed screw (L) about 1/4 turn counterclockwise until the engine runs and accelerates smoothly. Erratic idling behavior Idle setting is too richNRotate the low speed screw (L) about 1/4 turn clockwise until the engine runs and accelerates smoothly. 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 (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. Removing the Spark Plug NMove the stop switch to0. NPull off the spark plug boot (1). NUnscrew the spark plug. If the cutting attachment continues to run when the engine is idling, have your machine checked and repaired by your servicing dealer. Spark Plug 1 232BA081 KN
FS 55, FS 55 C, FS 55 R, FS 55 RC English 34 Checking the Spark Plug NClean dirty spark plug. NCheck electrode gap (A) and readjust if necessary – see Specifications. NUse only resistor type spark plugs of the approved range. Rectify problems which have caused fouling of spark plug: –Too much oil in fuel mix. –Dirty air filter. –Unfavorable running conditions, e.g. operating at part load. Installing the spark plug NScrew home the spark plug, fit the boot and press it down firmly.If engine running behavior is unsatisfactory even though the air filter is clean and the carburetor is properly adjusted, the cause may be the muffler. Have the muffler checked for contamination (carbonization) by your servicing dealer. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. 000BA039 KNA Warning! To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (1) snugly onto spark plug terminal (2) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire con- nector in the boot may create arcing that could ignite combustible fumes and cause a fire. 1 2 000BA071 KN Engine Running Behavior
FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish 35 To help prolong the wear life of the starter rope, observe the following points: NPull the starter rope only in the direction specified. NDo not pull the rope over the edge of the guide bushing. NDo not pull out the rope more than specified. NDo not allow the starter grip to snap back, guide it back into the housing slowly – see chapter on Starting / Stopping the Engine. Have a damaged starter rope replaced by your dealer before it breaks completely. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.NCheck lubricant filling periodically and after approx. every 25 hours of operation NUnscrew the locking screw (1) – if no grease can be seen on the inside, then screw in the tube (2) of STIHL gear lubricant for brushcutters (special accessory) NSqueeze up to 1/5 oz (5 g) of grease into the gear housing NUnscrew lubricant tube (2) NRefit locking screw and tighten securelyFor periods of 3 months or longer NDrain and clean the fuel tank in a well ventilated area. NDispose of fuel properly in accordance with local environmental requirements. NRun the engine until the carburetor is dry – this helps prevent the carburetor diaphragms sticking together. NRemove, clean and inspect the cutting attachment. NThoroughly clean the machine – pay special attention to the cylinder fins and air filter. NStore the machine in a dry and secure location – out of the reach of children and other unauthorized persons. Rewind StarterLubricating the Gearbox Do not completely fill the gear housing with grease. 1 233BA010 KN 2 Storing the Machine
FS 55, FS 55 C, FS 55 R, FS 55 RC English 36 NUse a sharpening file (see Special Accessories) to sharpen dull cutting attachments. In case of more serious wear or nicks: Resharpen with a grinder or have the work done by a dealer – STIHL recommends a STIHL servicing dealer. NResharpen frequently, take away as little material as possible: two or three strokes of the file are usually enough. NResharpen the cutters (1) uniformly – do not alter the contour or the parent blade (2) in any way. See cutting attachment packaging for additional sharpening instructions. Balancing NAfter resharpening about 5 times, check the cutting tool for out-of- balance on a STIHL balancer (special accessory) or have it checked by a dealer and re- balanced as necessary – STIHL recommends a STIHL servicing dealer. Maintenance Work STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. Fuel Pickup Body in Tank NHave the pickup body in the fuel tank replaced every year. Spark Arrestor in Muffler NIf the engine is down on power, have the spark arrestor in the muffler checked. Sharpening Metal Cutting Blades 22 1 002BA124 KN 1 Inspections and Maintenance by Dealer
FS 55, FS 55 C, FS 55 R, FS 55 RCEnglish 37 Maintenance and Care The following intervals apply to normal operating conditions only. If your daily work- ing time is longer or operating conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly. before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required Complete machineVisual inspection (condition, leaks)XX CleanX Control handle Check operationXX Air filterCleanXX ReplaceX Pickup body in fuel tankCheckX Have replaced by dealer 1)XXX Fuel tank CleanXX CarburetorCheck idle adjustment – the cutting attachment must not turnXX Readjust idle speedX Spark plugReadjust electrode gapX Replace after every 100 operating hours Cooling inletsVisual InspectionX CleanX Spark Arrestor in MufflerHave checked by dealer 1)XX Have cleaned or replaced by servicing dealer 1)XX All accessible screws and nuts (not adjust- ing screws)RetightenX
FS 55, FS 55 C, FS 55 R, FS 55 RC English 38 Cutting AttachmentVisual InspectionXX ReplaceX Check tightnessXX Metal cutting attachment SharpenXX Safety labels ReplaceX 1)STIHL recommends a STIHL servicing dealer. The following intervals apply to normal operating conditions only. If your daily work- ing time is longer or operating conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly. before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required