Husqvarna 525RK, 525RXT manual Maintenance, Carburettor, Muffler

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MAINTENANCE

Carburettor

Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions. After the engine has used 8-10 tanks of fuel the engine will be run-in. To ensure that it continues to run at peak performance and to minimise harmful exhaust emissions after the running-in period, ask your dealer/ service workshop (who will have a rev counter at their disposal) to adjust your carburettor.

Function

•The carburettor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburettor. The air/fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.

•Adjusting the carburettor means that the engine is adapted to local operating conditions, e.g. climate, altitude, petrol and the type of 2-stroke oil.

•The carburettor has three adjustment controls: L = Low speed jet

H = High speed jet

T = Idle adjustment screw

T

H

L

•The L and H-jets are used to adjust the supply of fuel to match the rate that air is admitted, which is controlled with the throttle. If they are screwed clockwise the air/fuel ratio becomes leaner (less fuel) and if they are turned anti-clockwise the ratio becomes richer (more fuel). A lean mixture gives a higher engine speed and a rich mixture gives a lower engine speed.

•The T-screw regulates the throttle setting at idle speed. If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

Basic setting

•The basic carburettor settings are adjusted during testing at the factory. The basic setting is richer than the optimal setting and should be maintained for the first few hours the machine is in use. The carburettor should then be finely adjusted. Fine adjustment should be carried out by a skilled technician.

CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned anti-clockwise until the cutting attachment stops.

Adjustment of the idle speed

Before any adjustments are made, make sure that the air filter is clean and the air filter cover is fitted.

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.

Recommended idle speed: See the Technical data section.

!

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.

Muffler

CAUTION! Some mufflers are fitted with a catalytic converter. See chapter on Technical data to see whether your machine is fitted with a catalytic converter.

The muffler is designed to reduce the noise level and to direct the exhaust gases away from the operator. The exhaust gases are hot and can contain sparks, which may cause fire if directed against dry and combustible material.

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Contents 525RX 525RXT 525RK Symbols KEY to SymbolsOperator of the machine must Ensure, while working, that no Persons or animals come closer thanContents Dear Customer IntroductionWhat is what on the brush cutter? What is WHAT?Personal protective equipment General Safety PrecautionsThrottle lockout Machine′s safety equipmentCutting attachment guard Stop switchVibration damping system Muffler Cutting equipment Cutting equipmentGeneral rules Sharpening the saw blade Sharpening grass knifes and grass bladesTrimmer head Assembly AssemblyFitting the handlebar Assembling and dismantling the two-piece shaft 525RKFitting a blade guard, grass blade and grass cutter Assembling the cutting equipmentDismantling Cause serious personal injuryFitting other guards and cutting attachments Fitting the blade guard and saw bladeStandard harness Adjusting the harness and brush cutterFuel Handling Fuel safetyFuel Mixing FuelingMuffler gets very hot during and after Use. This also applies during idling. BeCheck before starting Starting and StoppingStarting and stopping StartingNever twist the starter cord around your hand StoppingWorking Techniques Basic safety rulesGeneral working instructions ABC of clearing Forestry clearing using a saw blade Brush cutting with a saw blade Grass clearing using a grass bladeGrass trimming with a trimmer head TrimmingSweeping CuttingCarburettor MaintenanceMuffler Spark plug Cooling systemAir filter Cleaning the air filterBevel gear Two-piece shaft 525RKMaintenance Daily Weekly Monthly Maintenance scheduleTechnical data Technical DataEC Declaration of Conformity Approved accessories Type Cutting attachment guard, Art. noApplies to Europe only EN ISO 121002010, EN ISO 11806-12011, ISO 149821998, CisprPage Alloy Super Auto Super Auto II T25 T35, T35x Original instructions 1154807-26

525RXT, 525RK, 525RX specifications

The Husqvarna 525RX, 525RK, and 525RXT are top-of-the-line brushcutters designed for professional landscapers and homeowners alike. These models stand out for their powerful performance, ergonomic design, and advanced technology, making them ideal for tackling tough vegetation and maintaining landscapes.

Starting with the Husqvarna 525RX, this brushcutter is powered by a robust 25cc engine that delivers impressive power and efficiency. The Auto Return Stop Switch feature is a key innovation that allows the operator to easily start the machine by returning the stop switch to the ON position automatically after shutting it down. Additionally, the 525RX boasts a smart, lightweight design that reduces operator fatigue, making it suitable for extended use. Its harness system is well-padded and adjustable, ensuring comfort during long hours of work.

The 525RK model takes things a step further with its robust build designed for heavy-duty tasks. It features an aluminum shaft, providing enhanced durability while keeping the overall weight manageable. The 525RK is equipped with a high-performance engine similar to the 525RX but is optimized for even greater torque, making it perfect for cutting through thicker brush. Its Easy to Start system ensures a hassle-free ignition, while the innovative air filter system increases the interval between cleaning, ultimately reducing maintenance work.

The Husqvarna 525RXT is the flagship model in this series, combining the best features of the 525RX and 525RK. It is powered by an efficient 25cc engine that enables quick acceleration and exceptional cutting performance. One of its standout features is the Speed Feed trimmer head, which allows for quick and easy line reloading without disassembly, saving time and effort. Furthermore, the 525RXT has a unique X-Torq engine design that reduces fuel consumption and emissions while boosting power output, aligning with modern environmental standards.

All three models come with Husqvarna's intuitive design that includes adjustable handlebars for added user comfort. Moreover, they all integrate advanced vibration dampening systems to minimize operator fatigue. These brushcutters are equipped with durable and versatile cutting attachments, allowing users to switch between tasks effortlessly.

In conclusion, the Husqvarna 525RX, 525RK, and 525RXT are exceptional tools in the world of landscaping and vegetation management. Their blend of powerful engines, user-friendly features, and innovative technologies make them suitable for both professional landscapers and dedicated homeowners looking to maintain their properties efficiently. With these models, Husqvarna continues to uphold its reputation for quality and reliability in outdoor power equipment.
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