Jonsered GR41/50 Low speed jet L, Fine adjustment of the idle speed T, High speed jet H RS52

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MAINTENANCE

Low speed jet L

Try to find the highest idling speed, turning the low speed needle L clockwise respectively counter-clockwise. When the highest speed has been found, turn the low speed needle L 1/ 4 turn counter-clockwise.

+ 1/4

L

Fine adjustment of the idle speed T

Adjust the idle speed using the idle adjustment screw T, if it is necessary to readjust. First turn the idle adjustment screw T clockwise until the cutting attachment starts to rotate. Then turn the screw anticlockwise until the cutting attachment stops. The idle speed is correctly adjusted when the engine will run smoothly in every position.The idle speed should also be well below the speed at which the cutting attachment starts to rotate.

WARNING! If the idle speed cannot be

!adjusted so that the cutting attachment stops, contact your dealer/service workshop. Do not use the machine until it has been correctly adjusted or repaired.

High speed jet H (GR41, GR50, RS44)

The high speed jet H affects the engine power, speed, temperature and fuel consumption. If the high speed jet H is set too lean (screwed in too far) the engine speed will be too high and cause engine damage. Do not let the engine run at full speed for more than 10 seconds.

Apply full throttle and turn the high speed jet H very slowly clockwise until the engine slows down. Then turn the high speed jet H very slowly anticlockwise until the engine starts to run unevenly. Now turn the high speed jet H slowly clockwise a little way until the engine runs smoothly.

H

Note that the engine should not be under load when you adjust the high speed jet H. You should therefore remove the cutting attachment, nut, support flange and drive disc before adjusting the high speed jet H.

The high speed jet H is adjusted correctly when the machine burbles a little. If the machine races then the setting is too lean. If the engine produces a lot of smoke and burbles a lot then the setting is too rich.

CAUTION! For optimum adjustment of the carburettor, contact a qualified dealer/service workshop that has a revolution counter at their disposal.

High speed jet H (RS52)

The high speed jet H affects the engine power, speed, temperature and fuel consumption. If the high speed jet H is set too lean (screwed in too far) the engine speed will be too high and cause engine damage. Do not let the engine run at full speed for more than 10 seconds.

Setting procedure without a load (Blade can be used)

The machine is equipped with speed control in the ignition system. It is extremely important to be aware of this when adjusting the carburettor.

RS52: Speed control at: 13500 rpm

When attempting to adjust the speed over that specified, the speed is not changed, but only causes the engine to receive too little fuel resulting in a large risk of engine failure.

Run the machine warm for approximately 5 minutes alternating between short intervals of full throttle and idling. When the carburettor is to be adjusted, apply full throttle and turn the H-needle anti-clockwise until the engine speed reaches 10,500-11,000 r/min (burbles) or until the cap reaches its stop position. Now turn the H-needle slowly clockwise until the engine reaches the speed when the speed control comes into force. In some cases, speed control can come into force at 200-300 revs below or above that specified. It is important that you do not continue to turn the H-needle clockwise when the engine speed has stabilised. Screw the H-needle (anti-clockwise) a few tenths of a turn instead.

H

Setting procedure with a load (Trimmer head should be used)

Ensure the length of the trimmer cord is correct, i.e. exactly reaches the knife on the trimmer guard. Use either 3 mm or 3.3 mm diameter trimmer cord.

Run the machine warm for about 5 minutes mostly at full throttle. When the carburettor is to be adjusted, apply full throttle and turn the H-needle anti-clockwise until the engine burbles or until the cap reaches its stop position. (If the engine runs smoothly when the cap is in its stop position no further adjustment is necessary!) Turn the H-needle slowly clockwise until the engine runs absolutely smoothly. (Burbling has stopped completely). Now screw the H-needle (anti- clockwise) a few tenths of a turn.

H

CAUTION! For optimum adjustment of the carburettor, contact a qualified dealer/service workshop that has a revolution counter at their disposal.

26 – English

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Contents Operator’s manual EPA KEY to Symbols SymbolsContents Introduction Dear customerWhat is WHAT? What is what on the clearing saw? RS44What is what on the clearing saw? RS52 General Safety Precautions Personal protective equipmentThrottle lock Machine′s safety equipmentStop switch Quick release Cutting attachment guardVibration damping system MufflerLocking nut Locking screwSharpening grass cutters and grass blades Cutting equipmentCutting equipment Sharpening the saw blade Trimmer headFitting a blade guard, grass blade and grass cutter AssemblyTransport position, handlebar Blade guard a is fitted using 4 screws L as shown Fitting the blade guard and saw bladeStandard harness Adjusting the harness and clearing sawFitting other guards and cutting attachments Correct balance Adjusting the harnessVector harness Fuel Fuel safetyFuel Handling Fueling MixingStarting and stopping Starting and StoppingCheck before starting Cold engineStarting StoppingGeneral working instructions Basic safety rulesWorking Techniques ABC of clearingForestry clearing using a saw blade Brush cutting with a saw bladeGrass clearing using a grass blade Grass trimming with a trimmer headSweeping Maintenance CarburetorHigh speed jet H GR41, GR50, RS44 Fine adjustment of the idle speed TLow speed jet L High speed jet H RS52Cooling system Correctly adjusted carburetorMuffler Air filterSpark plug Cleaning the air filterBevel gear Maintenance schedule Maintenance Daily Weekly MonthlyTechnical Data Technical dataFederal Emission Control Warranty Statement Your Warranty Rights and ObligationsTrimmy SII Page ´z+R!o¶5*¨ Page 1150017-95 ´z+R!o¶5*¨ ´z+R!o¶5*¨

GR41/50 specifications

The Jonsered GR41/50 is a robust and versatile garden tractor designed for both commercial and residential use. Known for its reliability and efficient performance, this model has become a preferred choice among landscaping professionals and homeowners alike.

One of the standout features of the Jonsered GR41/50 is its powerful engine. It typically comes equipped with a 500cc gasoline engine that ensures optimal performance. This engine provides ample power for tackling a variety of tasks, from mowing large lawns to handling more demanding gardening activities. The automatic transmission allows for smooth and effortless operation, enabling users to focus on their gardening tasks without the distraction of manual gear shifting.

The GR41/50 boasts a robust cutting deck, usually available in multiple sizes, allowing users to select the right width for their specific needs. The cutting height can often be adjusted easily, ensuring precision lawn care while catering to different grass types and growing conditions. This feature is particularly useful for achieving a well-maintained and healthy lawn throughout the changing seasons.

In terms of technology, the Jonsered GR41/50 features advanced steering mechanisms, often with a tight turning radius, making it easy to navigate around obstacles in the garden. This agility enhances productivity and ensures that users can cover ground more efficiently. Additionally, many models come equipped with ergonomic seating and controls, promoting comfort during prolonged use and reducing operator fatigue.

Durability is another significant aspect of the Jonsered GR41/50. Built with high-quality materials, this garden tractor is designed to withstand the rigors of frequent use. The sturdy frame and reliable components contribute to its long lifespan, making it a wise investment for those seeking a reliable gardening machine.

Moreover, the GR41/50 often includes a range of attachments and accessories, such as plows, tow-behind trailers, and snow removal equipment, transforming it into a multi-functional tool for year-round use. This versatility not only maximizes its utility but also provides excellent value for users.

In summary, the Jonsered GR41/50 is a well-rounded garden tractor that combines power, technology, and durability. With its remarkable features, user-friendly design, and adaptability to various tasks, it stands out as a top choice for anyone looking to enhance their gardening and landscaping efficiency.
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